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- W249220623 abstract "In order to survey the distribution of vernalization and photoperiod genes in Shaanxi wheat cultivars,173 cultivars were characterized with STS markers for the vernalization and photoperiod genes Vrn-A1,Vrn-B1,Vrn-D1,Vrn-B3 and Ppd-D1.The average frequency of dominant alleles at the four vernalization gene loci in Shaanxi wheat cultivars was ranked as Vrn-D1(38.2%)Vrn-B1(16.2%)Vrn-A1b(1.2%)Vrn-B3(0%).The frequencies of dominant alleles at vernalization Vrn-A1,Vrn-B1,Vrn-D1,Vrn-B3 loci among the four wheat zones from Shaanxi province were different.All cultivars released from Northern Winter Wheat Region(NWWR) governed by Shaanxi province carried recessive alleles at these four vernalization loci.The frequencies of dominant alleles at the four vernalization loci in Yellow Huai River Facultative Winter Wheat Region(YHRFWWR),Middle Low Yangtze Valley Winter Wheat Region(MLYVWWR),and Southwestern Winter Wheat Region(SWWWR) governed by Shaanxi province were ranked as Vrn-D1(41.7%)Vrn-B1(19.1%)Vrn-A1(0%)=Vrn-B3(0%),Vrn-D1(40.3%)Vrn-B1(16.1%)Vrn-A1(0%) =Vrn-B3(0%),Vrn-D1(54.6%)Vrn-A1b(18.2%)=Vrn-B1(18.2%)Vrn-B3(0%),respectively.The frequency of dominant photoperiod insensitive Ppd-D1a alleles at Ppd-D1 locus in Shaanxi cultivars was 99.4%.Dominant allele combinations Vrn-D1,Ppd-D1a,Vrn-B1/Ppd-D1a,Vrn-D1/Ppd-D1a,Vrn-A1/Vrn-B1/Ppd-D1a,Vrn-A1/Vrn-D1/Ppd-D1a and Vrn-B1/Vrn-D1/Ppd-D1a were found in Shaanxi cultivars,and their average proportions were 0.6%,49.7%,11.6%,32.3%,0.6%,0.6% and 4.6%,respectively.Frequencies of the dominant allele combinations at various zones from Shaanxi province were also different.Single dominant allele Ppd-D1a only appeared in NWWR.Five dominant allele combinations,including Vrn-D1,Ppd-D1a,Vrn-B1/Ppd-D1a,Vrn-D1/Ppd-D1a and Vrn-B1/Vrn-D1/Ppd-D1a,were found in YHRFWWR,and their frequencies were 1.2%,45.2%,13.1%,34.5% and 6.0%,respectively.Dominant allele combinations Ppd-D1a,Vrn-B1/Ppd-D1a,Vrn-D1/Ppd-D1a,Vrn-B1/Vrn-D1/Ppd-D1a appeared in MLYVWWR and their frequencies were 45.2%,14.5%,37.1% and 3.2%,respectively.Five dominant allele combinations,including Ppd-D1a,Vrn-D1/Ppd-D1a,Vrn-A1/Vrn-B1/Ppd-D1a,Vrn-A1/Vrn-D1/Ppd-D1a and Vrn-B1/Vrn-D1/Ppd-D1a,were observed in SWWWR and their frequencies were36.3%,36.3%,9.1%,9.1% and 9.1%,respectively.The information is important for breeders to breed wide-adaptability wheat cultivars in Shaanxi province." @default.
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- W249220623 date "2009-01-01" @default.
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- W249220623 title "Distribution of vernalization and photoperiod genes in Shaanxi wheat cultivars." @default.
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