Genetic analysis of seed dormancy QTLs in yardlong bean [Vigna unguiculata (L.) Walp. subsp. unguiculata Sesquipedalis Group]
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Abstract
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.
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