Molecular footprint of selection on growth period structure inferred from photoperiod gene-based association analysis in soybean

【摘要】：To meet with the demands of high-yield and broaden adaptions from human,growth period structure had been largely changed during domestication and genetic improvement in soybean(Glycine max(L.)Merr.).Underwent artificial selection,domesticated soybean had a shorter vegetative phase(V),a prolonged reproductive phase(R)and hence a larger R/V ratio than its wild progenitor Glycine soja Sieb.Zucc.However,the genetic basis of the domestication of soybean from wild materials is unclear.Here,soybean core collection consisting of 405 representive asscessions were phenotyped at three trial sites located at very different latitudes for four years years.A set of markers,including presence/absence variant(PAV)marker focusing on G.soja-specific genetical variant,and InDel(Insertion/Deletion)and SNP(single nucleotide polymorphism)marker locating on photoperiod-related candidate genes were developted for genotyping these 405 accessions.The major result of this study has been to show that variation at 124 loci is informative for assessing patterns of genetic diversity in Glycine spp..After correcting for population structure,18 significant marker-trait associations were identified for flowering time(6),maturity time(7)and growth period structure(5)respectively.Of them,ten loci were with seletion signals indicated by Fst analysis.These results will provide markers information for further discovery of the R/V related genes that can understand the domestication process and introgression novel genes in wild soybean for broadening the genetic base of modern soybean cultivars.