Seed dormancy is one of the key trait as the result of domestication in yardlong bean
[Vigna unguiculata (L.) Walp. subsp. unguiculata Sesquipedalis Group]. Seed dormancy is
important trait related to seed viability and seed germination. Yardlong bean has higher seed
coat permeability and better germination than its wild ancester. Currently, plant breeders prefer
to use wild type to improve plant cultivars due to a lot of hidden useful genes such as disease
and insect resistance, and resistant to inappropriate environment. The research finding reported
the genome regions where QTLs for seed dormancy-related traits in yardlong bean including
water absorption of seed, electrolyte leaching of seed and seed germination. Water absorption
of seed was controlled by three QTLs with phenotypic variance explained (PVE) of 6.45-
11.53% and alleles from yardlong bean increased water absorption. Electrolyte leaching of
seeds was controlled by two QTLs with PVE of 8.71 and 9.83 % and alleles from yardlong
bean increased the electrolyte leaching. QTL was not detected by composite interval mapping
for seed germination, but fourteen markers were associated with seed germination which
detected by single marker analysis. Thus, the result is useful for marker-assisted selection
development and further Vigna breeding program.
Keywords
Yardlong bean, Seed dormancy, Quantitative trait loci
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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