
Breeding

We continue to strengthen sweetpotato breeding in Africa to ensure continuous production of high yielding, disease-resistant, nutritious varieties adapted to local agro-climatic conditions and the preferred trait combination for producers, processors and consumers. Our accelerated breeding approach is based on having more sites at the earliest breeding stages. At least one of those sites will be a stress environment of interest, for example where virus pressure is high. With the accelerated breeding approach we have reduced the time from crossing to having a variety ready to release from 7-8 years to 4-5 years.
Sweetpotato Genebank
CIP’s extensive sweetpotato collection was begun in 1985 and the CIP genebank at present holds samples of over 8000 accessions (about a thousand of which are wild) from the Americas, Asia and Africa. The Center’s scientists use this diverse reservoir of genetic material to provide healthy planting material for farmers, and to breeders developing sweetpotato varieties with wider adaptability, pest resistance, and tolerance to abiotic stresses such as climate change. Researchers also improve varieties providing the particular qualities needed for processing and increased table use according to cultural preferences, and monitor and improve the nutritional properties of the crop, with special emphasis on increasing vitamin A content.
Germplasm Collection(s)
Global sweetpotato genetic diversity is maintained in a number of gene banks around the world. These contain various types of germplasm, ranging from wild relatives to cultivated varieties, including farmers’ landrace varieties, old varieties, currently important cultivars, and breeding materials. Because sweetpotato is a clonally propagated crop, typically sweetpotato germplasm is in clonal form (maintained in tissue culture, frozen, or as living plants in a greenhouse or field gene bank). Sweetpotato genetic resources may also be maintained as populations of seed; typcially the case for wild relatives and populations from breeding programs. There are many sweetpotato gene banks around the world, typically with information about sources and characteristics of the germplasm in them. We provide here information and links to gene banks and to sources of information about sweetpotato germplasm, including guidelines on sweetpotato germplasm characterization and gene bank management.

Weevils damage large proportions of sweetpotato harvests in Sub-Saharan Africa and induce the accumulation of toxic compounds in the healthy-looking parts of damaged storage roots. Through biotechnology, we are working on two strategies that will eventually be combined into widely-cultivated sweetpotato varieties.
Through biotechnology, we have introduced new genes that produce anti-weevil proteins in the sweetpotato storage root. In parallel, we are testing a new strategy to weaken specific genes of the weevils to block their development. These two strategies will eventually be combined into widely-cultivated sweetpotato varieties in SSA.
With conventional breeding, thousands of genes are shuffled and recombined to obtain a desired trait. In comparison, modern biotechnology adds as little as one single gene to provide the desired trait to an existing well-performing variety. As a result, the level of genetic modification is only a tiny fraction of that produced through conventional breeding.

Annual Sweetpotato Speedbreeders’ meetings are held to learn the latest methods and share findings. The scope of the Breeding CoP group is being expanded to include more research concerning marker-assisted breeding and sweetpotato genomics.
There are sweetpotato support platforms that backstop national program breeders in 14 SSA countries and co-supervise PhD candidate breeders. Annual Sweetpotato Speedbreeders’ meetings are held to learn the latest methods and share findings. The scope of the Breeding CoP group is being expanded to include more research concerning marker-assisted breeding and sweetpotato genomics.

Developments in genomics, which involves high-throughput DNA sequencing coupled to new analytical tools to identify genes associated with key traits, promise to make sweetpotato breeding much more efficient.
Sweetpotato is a hexaploid crop with two non-homologous ancestral genomes hypothesized. Knowledge of genome sequences is indispensable for basic biological research and long-term crop improvement. However, the polyploidy and the high degree of heterozygosity of the sweetpotato genome make it infeasible for whole genome sequencing.
As an alternative, we are in the process of generating high-quality genome sequences of diploid and highly homozygous accessions of Ipomea trifida and I. triloba, the two closest wild relatives and putative wild ancestors of the cultivated sweetpotato. The resulting two high-quality draft genomes will serve as references for cultivated sweetpotato and as the foundation for next generation breeding technologies for sweetpotato improvement.
-
Phenotypic diversity analysis of sweetpotato for breeding dual-purpose varietiesThe genetic diversity available in sweetpotato has not been explored to develop dual-purpose sweetpotato varieties (DPSVs). The objectives of this study were to assess the level of phenotypic diver...Read More »
-
Weevil Resistant Sweetpotato Through BiotechnologyAfrican sweetpotato weevils (SPW), Cylas puncticollis and C. brunneus, pose a major threat to sweetpotato, which plays a vital role in food security and income generation for both the urban and rur...Read More »
-
Protocol for tuber bulking maturity assessment of elite and advanced potato clonesBreeders at the Genetic and Crop Improvement Global Program (GCI) know that breeding clones must be suited to the cropping systems and length of the potato growing season of a particular region wit...Read More »
-
New methodology to control whitefly results in patent filing by EmbrapaThe unit of Genetic and Biotechnology Resources of Brazil’s National Agricultural Research Company (Embrapa) located in the country’s capital, Brasília, has filed on June 7, 2016 a patent request f...Read More »
-
Webinar: Marker-Assisted Breeding as Next-Generation Strategy for Genetic Improvement of sweetpotato in Sub Saharan AfricaThis webinar was held on 24th March, 2016 at 4.00 pm EAT. The main speakers were: Prof Craig Yencho – Distinguished Professor and Program Leader Sweetpotato and Potato Breeding and Genetics Program...Read More »
-
Adaptation and Genetic Analysis for Earliness and Yield of Yam Bean (Pachyrhizus SPP) in Rwanda
- Size: 1.5 MB
- Type:
- Pages: 27
-
Preliminary results of the heterosis trial in Mozambique with clones derived from Ugandan inter- and intra- gene pool crossesThe main objective of this presentation was:To demonstrate family means for inter genepool crosses 8A x 8B (64 families) and intra-genepool crosses 8A x 8A (n * n-1) / 2 = 24 families) as well as i...
- Size:
- Type:
- Pages:
-
-
Sweetpotato plant regeneration via an improved somatic embryogenesis protocolGenetic transformation holds considerable promise for sweetpotato enhancement, but is limited by the low regeneration efficiency of transformed cells. Somatic embryogenesis is the most efficient me...Read More »
-
Transgenic sweet potato plants carrying the delta-endotoxin gene from Bacillus thuringiensis var. tenebrionis.Some clones of sweet potato (Ipomoea batatas L.), transgenic plants of the cultivar ‘Jewel’, carrying the cryIIIA gene from Bacillus thuringiensis subsp. tenebrionis (B.t.t), were obtained. Molecul...Read More »
-
Segregation analysis of cry7Aa1 gene in F1 progenies of transgenic and non-transgenic sweetpotato crossesSweetpotato weevils are the most devastating pests of sweetpotato causing yield losses ranging from 60 to 100%. Their cryptic nature, where the larvae are found within plant tissues render them dif...
- Size:
- Type:
- Pages:
-
Biotechnology Applications for Improving Sweetpotato ProductionSweetpotato, (Ipomoea batatas L.), is a vegetatively propagated crop. Due to the cycles of propagation, viruses are accumulated, which contributes to the decline of sweetpotato yield and quality. S...
- Size: 110.6 kB
- Type:
- Pages: 5
-
Procedures for the Evaluation of Sweetpotato TrialsSweetpotato Research Guides (SPRGs) This document describes technologies that have been developed and used by CIP in cooperation with national agriculture research programs to promote research and ...
- Size: 8.3 MB
- Type:
- Pages: 86
-
Procedures for the Evaluation of Sweetpotato TrialsSweetpotato Research Guides (SPRGs) This document describes technologies that have been developed and used by CIP in cooperation with national agriculture research programs to promote research and ...
- Size: 8.3 MB
- Type:
- Pages: 86
-
The “Stage Selection Gain 1to3”Readme for SSG1to3 program The “Stage Selection Gain 1to3” (SSG1to3) in R (SSG1to3_R) or SAS (SSG1to3_SAS) is a simple program to determine the response to selection in standardized units (R) afte...
- Size: 139.6 kB
- Type: zip
- Pages: 1
-
UNBURIED TREASURE: Breeding better sweet potatoes for the worldNC State rescued the sweet potato industry in North Carolina and helped it grow into a global powerhouse. Now the university is leading an effort to breed sweet potatoes that could provide economic...
- Size: 21.4 MB
- Type:
- Pages: 84
-
Breeding of sweetpotato (Ipomoea batatas (L.) Lam) for drought tolerance and high dry matter content in Rwanda.Sweetpotato is the third most important root crop next to cassava and potato in Rwanda. Drought stress remains the leading abiotic constraint to sweetpotato production in the Southern and Eastern P...Read More »
-
Adapting sweetpotato production to changing climate in MozambiqueVines are the major source of planting material in sweetpotato. Extended dry spells hinder conservation of vines and in turn affect the availability of planting material at the onset of rains in so...
- Size: 204.5 kB
- Type:
- Pages: 9
-
VARIETAL IDENTIFICATION IN HOUSEHOLD SURVEYS: RESULTS FROM THREE HOUSEHOLD-BASED METHODS AGAINST THE BENCHMARK OF DNA FINGERPRINTING IN SOUTHERN ETHIOPIAAccurate crop varietal identification is the backbone of any high-quality assessment of outcomes and impacts. Sweetpotato (Ipomoea batatas) varieties have important nutritional differences, and the...
- Size: 407.7 kB
- Type:
- Pages: 15
-
Structure of sweet potato (Ipomoea batatas) diversity in West Africa covaries with a climatic gradientSub-Saharan agriculture has been identified as vulnerable to ongoing climate change. Adaptation of agriculture has been suggested as a way to maintain productivity. Better knowledge of intra-specif...
- Size: 3.0 MB
- Type:
- Pages: 17
-
Participatory selection of orange-fleshed sweetpotato varieties in north and north-east Côte d’IvoireSweetpotato is cultivated in all the regions of Côte d’Ivoire for consumption and as a source of income. Only varieties with white or yellow flesh are grown. Production of nutritious orange-fleshed...
- Size: 480.6 kB
- Type:
- Pages: 8
-
La promotion de la patate douce riche en bêta carotène en Côte d’IvoireLa patate douce est cultivée dans toutes les régions de Côte d’Ivoire, surtout les variétés à chair blanche. Pourtant les variétés à chair orange et jaune sont plus riches en bêta carotène (provita...
- Size: 514.8 kB
- Type:
- Pages: 2
-
Survival of sweetpotato (Ipomoea batatas [L] Lam) vines in cultivars subjected to long dry spells after the growing season in MozambiqueOptimisation of sweetpotato production potential is not realized in sub-Saharan Africa where dry spells are common after the growing season. Lack of seed cultivars at the beginning of the rainy sea...
- Size:
- Type:
- Pages:
-
Evaluation of sweetpotato accessions for end-user preferred traits improvementThis study assessed the genetic diversity and differentiation in sweetpotato accessions in Ghana to guide selection for genetic improvement on beta-carotene, dry matter and sugar contents to promot...
- Size: 758.0 kB
- Type:
- Pages: 14
-
Breeding Superior Orange-Fleshed Sweetpotato Cultivars for West AfricaVitamin A deficiency (VAD) is of public health significance in the developing world. In spite of extensive promotion of orange-fleshed sweetpotato (Ipomoea batatas) varieties (OFSPs), they are poor...
- Size: 1.5 MB
- Type:
- Pages:
-
S-metolachlor and rainfall effects on sweetpotato(Ipomoea batatas L. [Lam]) growth and developmenttThe herbicide S-metolachlor is used to control or suppress annual grasses, nutsedges and several broadleafweeds in sweetpotato. However, a decline in storage root quality is suspected when an exce...
- Size: 1.2 MB
- Type:
- Pages: 7
-
Screening Sweetpotato Breeding Clones [Ipomoea batatas (L.) Lam] as a Suitable Potential Source of Feedstock for Bioethanol ProductionExperiments were conducted to evaluate white and orange fleshed sweetpotatoes as a feedstock for bioethanol production, based on dry matter (DM), extractable starch, amylose-amylopectin ratio, ferm...
- Size: 563.2 kB
- Type:
- Pages: 7
-
Ex ante assessment of dual-purpose sweet potato in the crop-livestock system of western Kenya: A minimum-data approachMixed crop–livestock systems have a crucial role to play in meeting the agricultural production challenges of smallholder farmers in sub-Saharan Africa. Sweet potato is seen as a potential remedial...Read More »
-
‘NASPOT 12 O’ and ‘NASPOT 13 O’ SweetpotatoTwo sweetpotato [Ipomoea batatas L. (Lam.)] cultivars, NASPOT 12 O (Namulonge sweetpotato 12 orange-fleshed) and NASPOT 13 O (Namulonge sweetpotato 13 orange-fleshed) were approved for release by t...
- Size: 104.2 kB
- Type:
- Pages: 5
-
Genotype x environment interaction and selection for drought adaptation in sweetpotato (Ipomoea batatas [L.] Lam.) in MozambiqueSweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity. The objectives of this research were to estimate the impact of genotype × env...
- Size: 452.0 kB
- Type:
- Pages: 20
-
ADAPTATION AND STABILITY ANALYSIS OF SWEETPOTATO VARIETIES FOR LOW-INPUT SYSTEMS IN UGANDASixteen sweet potato varieties were evaluated for fresh storage root yield in 20 trials during 2000-2001 for three seasons in four locations in Uganda. Of the 16 varieties, 11 were developed by far...
- Size:
- Type:
- Pages:
-
POSTER: OFSP PROGENIES RESPONSES TO DIFFERENT ENVIRONMENTAL CONDITIONS IN BURKINA FASOThe poster outlines how ggenenotype by Environment (GxE) interaction analysis has helped to select varieties combining good yield, high beta-carotene content and acceptable dry matter content. Howe...
- Size: 1.2 MB
- Type:
- Pages: 1
-
Selection, Yield Evaluation, Drought Tolerance Indices of Orange-Flesh Sweet potato (Ipomoea batatas Lam) Hybrid CloneOrange-Fleshed Sweet Potato (OFSP) varieties have high pro-vitamin A and medium amounts of iron and zinc. Drought susceptibility is perceived as one of the major drawbacks of this crop type and cur...
- Size: 2.2 MB
- Type:
- Pages: 8
-
FORM 4E STORAGEStandard CIP breeding manual for sweetpotato breeding in Sub-Saharan Africa. Includes separate documents for a) overall conduct and analysis of selection trials, b) on-farm trial procedures, and c)...
- Size:
- Type:
- Pages:
-
Procedures for the evaluation and analysis of sweetpotato trialsStandard CIP breeding manual for sweetpotato breeding in Sub-Saharan Africa. Includes separate documents for a) overall conduct and analysis of selection trials, b) on-farm trial procedures, and c)...
- Size:
- Type:
- Pages:
-
ON-FARM PARTICIPATORY VARIETY TESTING---PROTOCOLS (May, 2012)On-farm trials are an effective way to improve client-orientation of breeding programs by formalizing farmer involvement in the variety testing process. They can also be an important first step in ...
- Size:
- Type:
- Pages:
-
Genetic Variation, Diversity and Genotype by Environment Interactions of Nutritional Quality Traits in East African SweetpotatoThis study sought to contribute to the pre-breeding knowledge base required for the improvement of sweetpotato nutritional quality targeting beta-carotene, dry matter, starch, sucrose and minerals ...
- Size: 944.9 kB
- Type:
- Pages: 104
-
Chemical and technological evaluation of some sweet potato varietiesThis investigation was carried out to evaluate the chemical characteristics of eight new sweetpotato varieties and study their suitability for pocessing.
- Size: 2.7 MB
- Type:
- Pages: 12
-
Induction of somatic embryogenesis in recalcitrant sweetpotato (Ipomoea batatas L.) cultivarsGenetic transformation is considered as one of the most promising options for improvement of crop traits. Current transformation methods for sweetpotato depend on plant regeneration through organog...
- Size:
- Type:
- Pages:
-
Segregation analysis of cry7Aa1 gene in F1 progenies of transgenic and non-transgenic sweetpotato crossesSweetpotato weevils are the most devastating pests of sweetpotato causing yield losses ranging from 60 to 100%. Their cryptic nature, where the larvae are found within plant tissues render them dif...
- Size:
- Type:
- Pages:
-
Expression of sweetpotato-like cry genes to control weevilsWeevil active proteins were identified previously with efficacy against the two African weevil species, Cylas puncticollis and C. brunneus, responsible of huge production loss of the sweetpotato in...
- Size:
- Type:
- Pages:
-
SASHA Brief 2011: Benefits of weevil resistant sweetpotato varietiesWeevil is a major threat to sweetpotato, which plays a vital role in food security and income generation for both the urban and rural poor in Sub-Saharan Africa. Weevils can devastate sweetpotato p...
- Size:
- Type:
- Pages:
-
Trader and consumer criteria for selection of sweetpotato varietiesThis section gives descriptions of methods by which the Tanzania breeding programme obtained necessary information to decide main selection criteria for new cultivars and also reports on main study...
- Size: 8.1 MB
- Type:
- Pages:
-
The use of consumer tests and trained test panels to assess sensory characteristics
- Size: 6.3 MB
- Type:
- Pages:
-
Diallel analysis of root dry matter content in sweetpotatoThere has been much emphasis on breeding for increased sweetpotato storage root yields, but less on the dry matter yield, and its inheritance. High dry matter content (DMC) is associated with consu...
- Size: 24.8 kB
- Type:
- Pages: 5
-
One Million Hectares: World-wide Varietal Change in Potatoes and the Contribution of the International Potato CenterDevelopment and availability of appropriate varieties and crop technologies are critical if we are to meet rising food security needs, including an increased potato demand at affordable prices for ...
- Size: 1.4 MB
- Type:
- Pages: 2
-
Sweetpotato Breeding in Ghana in Partnership with the Sweetpotato for Profit and Health InititiativeSweetpotato is increasingly important in African agriculture for combating food insecurity and malnutrition, particularly vitamin A deficiency. The Sweetpotato for Profit and Health Initiative (SPH...
- Size:
- Type:
- Pages:
-
Effect of GxE Interaction on Root Yield and Betacarotene Content of Selected Sweetpotato (Ipomoea batatas (L) Lam.) Varieties and Breeding ClonesA multilocational field trial involving nine sweetpotato clones of diverse origins was conducted across four different locations to investigate GxE interaction effects on commercial root yield and ...
- Size: 352.6 kB
- Type:
- Pages: 7
-
Damage to storage roots by insect pestsDamage to sweetpotato storage roots by insect pests, even when it occurs before harvest, can be considered a post-harvest problem. It reduces both the nutritional and economic value of the storage ...
- Size: 12.3 MB
- Type:
- Pages:
-
Evaluation of newly introduced sweetpotato germplasm under Egyptian conditionsFourteen cultivars/clones of sweetpotato were delivered to AGERI from International Potato Center (CIP) Nairobi in 2002 as cuttings. They were propagated in vitro for massive micro-propagation. Dif...
- Size: 220.1 kB
- Type:
- Pages: 7
-
Sweetpotato breeding for northeastern Uganda: Farmer varieties, farmer-participatory selection, and stability of performanceBetween 1999 and 2001, the author conducted various studies, primarily in northeastern Uganda, aimed at rapidly assessing the potential of farmer varieties of sweetpotato (Ipomoea batatas) from nor...
- Size: 5.3 MB
- Type:
- Pages: 154
-
Working with farmer groups in Uganda to develop new sweet potato cultivars: decentralisation and building on traditional approachesScientists and farmers in Uganda identiÞed preferred sweet potato: (1) varieties through participatory varietal selection (PVS); and (2) new clones from seedling populations through a participatory...
- Size: 311.0 kB
- Type:
- Pages: 12
-
Farmer criteria for selection of sweetpotato varietiesIn Tanzania, despite its importance in food systems there has been little expansion in the aggregate acreage of sweetpotato over several years. The poor uptake of some new varieties in the past has...
- Size: 7.1 MB
- Type:
- Pages: {
-
Novel Plant Regeneration for Egyptian Sweetpotato (Ipomoea Batatas (L.) Lam.) Abees Cultivar via Indirect Organogenesis Stimulated by Initiation Medium and Cytokinin EffectsIn this study, a simple and efficient plant regeneration system in Egyptian sweetpotato Abees recalcitrant cultivar via indirect organogenesis was established. Two initiation medium and different r...
- Size: 346.8 kB
- Type:
- Pages: 9
-
UNBURIED TREASURE: Breeding better sweet potatoes for the worldNC State rescued the sweet potato industry in North Carolina and helped it grow into a global powerhouse. Now the university is leading an effort to breed sweet potatoes that could provide economic...
- Size: 21.4 MB
- Type:
- Pages: 84
-
Adapting sweetpotato production to changing climate in MozambiqueVines are the major source of planting material in sweetpotato. Extended dry spells hinder conservation of vines and in turn affect the availability of planting material at the onset of rains in so...
- Size: 204.5 kB
- Type:
- Pages: 9
-
‘NASPOT 12 O’ and ‘NASPOT 13 O’ SweetpotatoTwo sweetpotato [Ipomoea batatas L. (Lam.)] cultivars, NASPOT 12 O (Namulonge sweetpotato 12 orange-fleshed) and NASPOT 13 O (Namulonge sweetpotato 13 orange-fleshed) were approved for release by t...
- Size: 104.2 kB
- Type:
- Pages: 5
-
Sweetpotato cultivars with improved keeping qualities for East AfricaThis is the final technical report of a project, whose objective was to facilitate development of sweetpotato cultivars with improved post-harvest qualities, especially improved shelf-life and stor...
- Size: 379.0 kB
- Type:
- Pages:
-
Evaluation of 64 Clones selected from Advanced Yield Trials established between 2005/06 and 2009/10 in Maputo, Gaza, Zambezia and TeteThe present report describes the selection of the final best 15 clones from the multi-location trials of 64 clones conducted in Umbelúzi, Chókwè, Gurué, and Angónia for release. The primary objecti...
- Size: 3.8 MB
- Type:
- Pages: 73
-
CIP's Genebank the Future of Potato and Sweetpotato. Home of the largest In vitro genebank in the worldThe genetic resources maintained by CIP represent the heritage of many nations and the labor of countless farmers, plant explorers, and geneticists. The collections were made possible through the c...
- Size: 409.1 kB
- Type:
- Pages: 1
-
2019 SPHI Brief 34. Genomic tools for sweetpotato improvement project (GT4SP).We developed genomic and genetic resources for sweetpotato improvement, including genome sequencing and annotation of two diploid relatives, to be used as reference genomes for cultivated sweetpota...
- Size: 2.0 MB
- Type:
- Pages: 2
-
Presentation 05. Update on the GT4SP genomic tools for sweetpotato improvement project
- Size: 2.9 MB
- Type:
- Pages: 21
-
UNBURIED TREASURE: Breeding better sweet potatoes for the worldNC State rescued the sweet potato industry in North Carolina and helped it grow into a global powerhouse. Now the university is leading an effort to breed sweet potatoes that could provide economic...
- Size: 21.4 MB
- Type:
- Pages: 84
-
The BecA-ILRI Hub Annual Report 2017 - Mentoring Women to Become Future Leaders in ScienceAdero is a research assistant at the National Crops Resources Research Institute (NaCRRI) in Uganda where she is part of the Genomic Tools for Sweet Potato Improvement Project team. Besides develop...
- Size: 60.7 kB
- Type:
- Pages: 1
-
Selection of Simple Sequence Repeat Markers Associated with Inheritance of Sweetpotato Virus Disease Resistance in SweetpotatoSweetpotato virus disease (SPVD), a complex of Sweet potato chlorotic stunt virus (SPCSV; Crinivirus) and Sweet potato feathery mottle virus (SPFMV; Potyvirus) causes high yield losses in sub-Sahar...Read More »
-
Breeding Superior Orange-Fleshed Sweetpotato Cultivars for West AfricaVitamin A deficiency (VAD) is of public health significance in the developing world. In spite of extensive promotion of orange-fleshed sweetpotato (Ipomoea batatas) varieties (OFSPs), they are poor...Read More »
-
Current Status and Future Direction for Research on Agricultural Biotechnology in GhanaBiotechnology and related fields of science have over the years been used extensively to revolutionize agriculture and crop production. Although Genetic Engineering (GE) technology has rapidly pro...
- Size: 2.3 MB
- Type:
- Pages: 21
-
Diversity analysis of sweet potato (Ipomoea batatas [L.] Lam) germplasm from Burkina Faso using morphological and simple sequence repeats markersCollecting and characterizing plant material is a basic component of crop improvement, and diversity has long been seen as vital for rational management and use of crops. Thirty (30) morphological ...
- Size: 785.3 kB
- Type:
- Pages: 14
-
Genetic approaches towards marker-assisted and genomic selection, and the challenges in sweet potatoThis is a presentation by Dorcus Gemenet on Genetic approaches towards marker- assisted and genomic selection, and the challenges in sweet potato, during the sweet potato breeders' meeting in 2015....
- Size:
- Type:
- Pages:
-
Analysis of genetic diversity with molecular markersGenetic Diversity is the foundation of Breeding. In this presentation by Isabel Roldán-Ruiz, the following topics are discussed:Genetic variation and population geneticsConcept of populationHardy-W...
- Size: 703.7 kB
- Type:
- Pages: 48
-
Molecular markers: an introductionThis presentation by Isabel Roldán-Ruiz covers the following:Markers and breedingSome basic conceptsMutations, DNA-polymorphisms and DNA-markersDNA-marker techniquesSome DNA-marker techniques used ...
- Size: 4.7 MB
- Type:
- Pages: 63
-
Characterization and development of EST-derived SSR markers in cultivated sweetpotato (Ipomoea batatas)Background: Currently there exists a limited availability of genetic marker resources in sweetpotato (Ipomoea batatas), which is hindering genetic research in this species. It is necessary to devel...
- Size: 552.5 kB
- Type:
- Pages: 9
-
Segregation analysis of cry7Aa1 gene in F1 progenies of transgenic and non-transgenic sweetpotato crossesSweetpotato weevils are the most devastating pests of sweetpotato causing yield losses ranging from 60 to 100%. Their cryptic nature, where the larvae are found within plant tissues render them dif...
- Size:
- Type:
- Pages:
-
A Genetic Linkage Map of Sweetpotato (Ipomoea batatas (L) Lam) Based on AFLP MarkersGenetic linkage maps of Tanzania and Bikilamaliya sweetpotatoes (Ipomoea batatas (L.) Lam), based on amplified fragment-length polymorphism (AFLP) were developed using a two-way pseudo-testcross. A...
- Size: 673.2 kB
- Type:
- Pages: 11
-
Procedures for the Evaluation of Sweetpotato TrialsSweetpotato Research Guides (SPRGs) This document describes technologies that have been developed and used by CIP in cooperation with national agriculture research programs to promote research and ...
- Size: 8.3 MB
- Type:
- Pages: 86
-
Procedures for the Evaluation of Sweetpotato TrialsSweetpotato Research Guides (SPRGs) This document describes technologies that have been developed and used by CIP in cooperation with national agriculture research programs to promote research and ...
- Size: 8.3 MB
- Type:
- Pages: 86
-
The “Stage Selection Gain 1to3”Readme for SSG1to3 program The “Stage Selection Gain 1to3” (SSG1to3) in R (SSG1to3_R) or SAS (SSG1to3_SAS) is a simple program to determine the response to selection in standardized units (R) afte...
- Size: 139.6 kB
- Type: zip
- Pages: 1
-
2019 SASHA Brief 06. Breeding for continuous storage root formation and bulking in sweetpotato.Research conducted on diverse sweetpotato germplasm showed that some genotypes form their roots at the same time, that are of the same maturity (discontinuous storage root formation and bulking) a...
- Size: 1.6 MB
- Type:
- Pages: 2
-
2019 SASHA Brief 05. Breeding and prospects for low sweet sweetpotato in West Africa.A trained sensory panel was developed to assist with breeding for sweetpotato quality preferences of consumers in West Africa. Lexicons of terms to precisely describe boiled and fried sweetpotato ...
- Size: 3.5 MB
- Type:
- Pages: 4
-
2019 SASHA Brief 04. Major achievements in breeding for drought tolerance and high iron orange-fleshed sweetpotato in Mozambique: Lessons learned and achievements in phase 2 (2014-2019)Successful second round of accelerated breeding completed, with the release of 4 orange-fleshed (OFSP) and 3 purple-fleshed (PFSP) drought tolerant sweetpotato varieties in 2016. Third round will b...
- Size: 5.1 MB
- Type:
- Pages: 3
-
2019 SASHA Brief 02. A breakthrough: Hybrid population breeding validated in Peru, Uganda, and MozambiqueDetermine the response to selection for yield and quality in three applied breeding populations for a complete reciprocal recurrent selection cycle for (i) OFSP wide adaptation and earliness, (ii) ...
- Size: 2.3 MB
- Type:
- Pages: 6
-
Presentation 04. Gender responsive product profile development
- Size: 835.3 kB
- Type:
- Pages: 13
-
2019 SASHA Brief 03. Tackling virus resistance in hot spots.Discriminated between resistant and tolerant cultivars in response to Sweet potato feathery mottle virus (SPFMV) and Sweetpotato chlorotic stunt virus (SPCSV). Dual infection by SPCSV and SPFMV cau...
- Size: 1.4 MB
- Type:
- Pages: 2
-
Released / launched sweetpotato varieties in the Americas (update March 2019)This in an update appendix 1 in Grüneberg et al (2015) and provides details about released / launched sweetpotato varieties over the past three decades by 17 classification variables, namely 1) cou...Read More »
-
UNBURIED TREASURE: Breeding better sweet potatoes for the worldNC State rescued the sweet potato industry in North Carolina and helped it grow into a global powerhouse. Now the university is leading an effort to breed sweet potatoes that could provide economic...
- Size: 21.4 MB
- Type:
- Pages: 84
-
Effects of Sweet Potato Feathery Mottle Virus and Sweet Potato Chlorotic Stunt Virus on the Yield of SweetPotato in UgandaSweet potato feathery mottle virus (SPFMV) and Sweet potato chlorotic stunt virus (SPCSV) are the most common viruses infecting sweetpotato in Uganda. Field plots planted with graft inoculated plan...Read More »
-
Phenotypic diversity analysis of sweetpotato for breeding dual-purpose varietiesThe genetic diversity available in sweetpotato has not been explored to develop dual-purpose sweetpotato varieties (DPSVs). The objectives of this study were to assess the level of phenotypic diver...Read More »
-
Breeding Superior Orange-Fleshed Sweetpotato Cultivars for West AfricaVitamin A deficiency (VAD) is of public health significance in the developing world. In spite of extensive promotion of orange-fleshed sweetpotato (Ipomoea batatas) varieties (OFSPs), they are poor...Read More »
-
-
Structure of sweet potato (Ipomoea batatas) diversity in West Africa covaries with a climatic gradientSub-Saharan agriculture has been identified as vulnerable to ongoing climate change. Adaptation of agriculture has been suggested as a way to maintain productivity. Better knowledge of intra-specif...
- Size: 3.0 MB
- Type:
- Pages: 17
-
Survival of sweetpotato (Ipomoea batatas [L] Lam) vines in cultivars subjected to long dry spells after the growing season in MozambiqueOptimisation of sweetpotato production potential is not realized in sub-Saharan Africa where dry spells are common after the growing season. Lack of seed cultivars at the beginning of the rainy sea...
- Size:
- Type:
- Pages:
-
Progress and Plans at the Sweetpotato Support Platform for West AfricaThis presentation by Ted Carey is on;Sweetpotato Support Platform (SSP-WA)BreedingSeed (germplasm/exchange)Community
- Size: 1.8 MB
- Type:
- Pages: 25
-
Evaluation of sweetpotato accessions for end-user preferred traits improvementThis study assessed the genetic diversity and differentiation in sweetpotato accessions in Ghana to guide selection for genetic improvement on beta-carotene, dry matter and sugar contents to promot...
- Size: 758.0 kB
- Type:
- Pages: 14
-
Webinar: Marker-Assisted Breeding as Next-Generation Strategy for Genetic Improvement of sweetpotato in Sub Saharan AfricaThis webinar was held on 24th March, 2016 at 4.00 pm EAT. The main speakers were: Prof Craig Yencho – Distinguished Professor and Program Leader Sweetpotato and Potato Breeding and Genetics Program...Read More »
-
Genotype x environment interaction and selection for drought adaptation in sweetpotato (Ipomoea batatas [L.] Lam.) in MozambiqueSweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity. The objectives of this research were to estimate the impact of genotype × env...
- Size: 452.0 kB
- Type:
- Pages: 20
-
CloneSelector: A new tool for Accelerated Analysis of Sweetpotato Breeding TrialsCloneSelector is an Excel based tool developed to help plant breeders, working with clonally propagated crops, carry out field trials, analyze the results and make accurate selection decisions. In ...
- Size: 322.6 kB
- Type:
- Pages: 1
-
Adaptability and stability of sweetpotato varieties for low-input systems in UgandaSixteen of sweet potato varieties were evaluated for fresh storage roots yield in 20 trials during 2000-2001 for three seasons in four locations in Uganda.Of the 16 varieties, 11 were developed by ...
- Size: 6.2 MB
- Type:
- Pages: 7
-
Evaluation of Dual Purpose Sweetpotato Cultivars for Root and Fodder Yields in Eastern Province of Rwanda
- Size: 2.9 MB
- Type:
- Pages: 31
-
Genomic-Assisted Breeding in Sweetpotato: Current status and future opportunitiesWhen conducting Genomic-Assisted Breeding in Sweetpotato we need:High-throughput, precise, accurate and standardized phenotyping in multiple environmentsDatabase to store and access genotypic, phen...
- Size:
- Type:
- Pages:
-
Sweetpotato breeding at the East and Central Africa Sweetpotato Support PlatformThis presentation covers the following:Background on Breeding Component Objective in SASHA 2Breeding at the East and Central Support PlatformMain breeding activities
- Size:
- Type:
- Pages:
-
Sweetpotato plant regeneration via an improved somatic embryogenesis protocolGenetic transformation holds considerable promise for sweetpotato enhancement, but is limited by the low regeneration efficiency of transformed cells. Somatic embryogenesis is the most efficient me...Read More »
-
Participatory Sweetpotato Improvement Tanzania (Lake and Eastern Zones)This Participatory Sweetpotato Improvement in Tanzania presentation discusses ways to improve and maintain sweetpotato germplasm, improve access to sweetpotato planting materials, promote value add...
- Size: 436.0 kB
- Type:
- Pages: 10
-
Sweetpotato Breeding Activities for 2012 at the NRCRI Umudike, Nigeria.The main objective for the Sweetpotato Breeding Activities at the NRCRI Umudike, Nigeria was: Development of new sweetpotato varieties that satisfy the agronomic, processing and nutritional require...
- Size: 447.6 kB
- Type:
- Pages: 13
-
Progress Report on Sweetpotato Breeding in GhanaThe CSIR-CRI SWEETPOTATO IMPROVEMENT PROGRAMME has aimed to achieve the following objectives:Development of high and stable yielding consumer preferred and accepted sweetpotato varieties.Production...
- Size: 3.7 MB
- Type:
- Pages: 25
-
Plant BreedingIn restricted sense a hybrid is a cross between two genetically different (homozygous) inbred lines. Such a cross is also called a “F1-hybrid” or a single cross.Products of a series of other crosse...
- Size: 8.6 MB
- Type:
- Pages: 34
-
Progress on Sweetpotato Breeding in Rwanda: Summer course on “New Techniques on Sweetpotato Breeding”This presentation by Shumbusha, Ndirigwe and Kankundiye during the Summer course on "New Techniques on Sweetpotato Breeding" in Belgium, Ghent University, 2012, addressed the progress of sweetpotat...
- Size: 1.4 MB
- Type:
- Pages: 12
-
Agro-Facts: Sweet Potato (Ipomoea batatas) BreedingThis manual is for researchers in the Pacific region who are starting sweet potato breeding programmes but lack training and experience in genetics and plant breeding. It is also for researchers an...
- Size: 899.0 kB
- Type:
- Pages: 42
-
Selection methods Part 5: Breeding clonally propagated cropsThis is a chapter from Plant Breeding and Farmer Participation, FAO (2009).
- Size: 2.9 MB
- Type:
- Pages: 48
-
Procedures for the evaluation and analysis of sweetpotato trialsStandard CIP breeding manual for sweetpotato breeding in Sub-Saharan Africa. Includes separate documents for a) overall conduct and analysis of selection trials, b) on-farm trial procedures, and c)...
- Size:
- Type:
- Pages:
-
Key access and utilization descriptors for sweet potato genetic resourcesThis minimum list consists of an initial set of characterization and evaluation descriptors for sweet potato utilization.This strategic set of descriptors, together with passport data, will become ...Read More »
-
Descriptors for sweetpotatoThis list consists of an initial set of characterization and evaluation descriptors for sweet potato utilization.This strategic set of descriptors, together with passport data, will become the basi...Read More »
-
Guidelines for regeneration of sweetpotato from seedWithin a sweet potato collection, a wide variation is generally observed in the flowering habits of different accessions. Under normal sowing conditions, some cultivars do not flower. Several techn...Read More »
-
Sweetpotato Breeding Under the Sweetpotato for Profit and Health InitiativeSweetpotato is playing an increasingly important role in African agriculture, combating food insecurity and undernourishment, particularly vitamin A deficiency. The Sweetpotato for Profit and Healt...
- Size:
- Type:
- Pages:
-
Introduction and Use of Exotic Germplasm in the Chinese Sweetpotato Breeding ProgramSweet potato (Ipomoea batatas) accessions of diverse origin were evaluated for dry matter (DM) content at Xuzhou during 1992-99. A number of high DM clones were selected and are currently under fur...
- Size: 73.8 kB
- Type:
- Pages: 6
-
Plant breeding and farmer participationThis book provides a comprehensive description and assessment of the use of participatory plant breeding in developing countries. It is aimed at plant breeders, social scientists, students and prac...Read More »
-
Working with farmer groups in Uganda to develop new sweet potato cultivars: decentralisation and building on traditional approachesScientists and farmers in Uganda identiÞed preferred sweet potato: (1) varieties through participatory varietal selection (PVS); and (2) new clones from seedling populations through a participatory...
- Size: 311.0 kB
- Type:
- Pages: 12
-
Novel Plant Regeneration for Egyptian Sweetpotato (Ipomoea Batatas (L.) Lam.) Abees Cultivar via Indirect Organogenesis Stimulated by Initiation Medium and Cytokinin EffectsIn this study, a simple and efficient plant regeneration system in Egyptian sweetpotato Abees recalcitrant cultivar via indirect organogenesis was established. Two initiation medium and different r...
- Size: 346.8 kB
- Type:
- Pages: 9
-
Plant Breeding and Farmer ParticipationThis book provides a comprehensive description and assessment of the use of participatory plant breeding in developing countries. It is aimed at plant breeders, social scientists, students and prac...Read More »