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Tag Archives: polyploid

Determining paternity in polyploids: Hexaploid simulation studies

The breeding of new sweetpotato varieties is a highly inefficient process, confounded by incompatibility, poor fertility, open-pollination and hexaploidy. Upwards of 12–20 lines are combined in open pollinated nurseries based on horticulturally important characteristics. After several years of selection most progeny can be traced back to just 3 or 4 …

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Identifying a Randomly Amplified Polymorphic DNA (RAPD) Marker Linked to a Gene for Root-knot Nematode Resistance in Sweetpotato

The inheritance of resistance to root-knot nematode race 3 [Meloidogyne incognita (Kofoid & White) Chitwood] in sweetpotato [Ipomoea batatas (L.) Lam.] was studied in 71 progenies of the F1 single-cross population produced from the cross of resistant parent ‘Regal’ and susceptible parent ‘Vardaman’. The distribution frequency of the progenies based …

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Autopolyploidy versus Allopolyploidy and Low-density Randomly Amplified Polymorphic DNA Linkage Maps of Sweetpotato

Low-density randomly amplified polymorphic DNA (RAPD) markers of sweetpotato [Ipomoea batatus (L.) Lam.; 2n = 6x = 90] were constructed from 76 pseudotestcross progenies obtained from ‘Vardaman’ x ‘Regal’. Of 460 primers, 84 generating 196 well-resolved repeatable markers were selected for genetic analysis. ‘Vardaman’ and ‘Regal’ testcross progenies were analyzed …

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