Use of Ipomoea trifida germ plasm for sweet potato improvement. 3. Development of 4x interspecific hybrids between Ipomoea batatas (L.) Lam. (2n=6x=90) and I. trifida (H.B.K) G. Don. (2n=2x=30) as storage-root initiators for wild species

More than 28,000 pollinations were carried out between 5 Ipomoea batatas and 41 diploid I. trifida accessions of diverse origins to obtain 4x interspecific hybrids. From the resultant 730 seeds, 248 plants were finally obtained. Ploidy level determination of the progeny showed unexpected results: 52...

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Bibliographic Details
Published inTheoretical and applied genetics Vol. 83; no. 2; p. 159
Main Authors Orjeda, G. (International Potato Center, Lima (Peru)), Freyre, R, Iwanaga, M
Format Journal Article
LanguageEnglish
Published Germany 01.12.1991
Subjects
2n gametes
GERMOPLASMA
GERMPLASM
HIBRIDACION INTERESPECIFICA
HYBRIDATION INTERSPECIFIQUE
INTERSPECIFIC HYBRIDIZATION
Interspecific hybrids
IPOMOEA
Ipomoea batatas
Ipomoea trifida
MATERIEL GENETIQUE
PLANTAS SILVESTRES
PLANTE SAUVAGE
POLIPLOIDIA
POLYPLOIDIE
POLYPLOIDY
WILD PLANTS
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Summary:More than 28,000 pollinations were carried out between 5 Ipomoea batatas and 41 diploid I. trifida accessions of diverse origins to obtain 4x interspecific hybrids. From the resultant 730 seeds, 248 plants were finally obtained. Ploidy level determination of the progeny showed unexpected results: 52 individuals were hexaploid, 5 were pentaploid, 190 were tetraploid, as expected, and one was not determined. The existence of 5x and 6x progenies from 6x x 2x crosses not only confirmed the presence of 2n gametes but also their successful function in gene flow between ploidy levels and polyploidization within this genus. The progeny and their cultivated parents were planted in an observation field. The cultivated parents produced 0.49 kg/plant or less. Most 4x progenies did not produce storage roots or had very poor yields; nonetheless, and despite their cultivated parents' poor yields, 8 genotypes yielded between 0.81 and 1.50 kg/plant.A new scheme, using the 4x interspecific hybrids, is proposed for evaluating 2x and 4x wild accessions of the section Batatas to which the sweet potato belongs. Other possible uses of the 4x hybrids in breeding and genetics of the sweet potato are also discussed.
Bibliography:92B0005
F30
ISSN:0040-5752
1432-2242
DOI:10.1007/bf00226245