【摘 要】
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Plant invertase hydrolyzes sucrose into glucose and fructose.Cell wall invertase(CWI),one of the three types of invertase,is essential for development of flowers,seeds,and fruits.Based on isolated TaC
【机 构】
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Shaanxi Key Laboratory of Genetic Engineering for Plant Breeding,College of Agronomy,Northwest A and
【出 处】
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第六届全国小麦基因组学及分子育种大会
论文部分内容阅读
Plant invertase hydrolyzes sucrose into glucose and fructose.Cell wall invertase(CWI),one of the three types of invertase,is essential for development of flowers,seeds,and fruits.Based on isolated TaCWIs on chromosomes 4A,5B and 5D,two SNPs were detected in the promoter region of TaCWI-4A,and four SNPs and two Indels were present in the TaCWI-5D gene.No polymorphism was detected in TaCWI-5B coding or promoter regions.CAPS markers caps4A and caps5D were developed to discriminate haplotypes of TaCWI-4A and TaCWI-5D,respectively.Marker/trait association analysis indicated that Hap-5D-C at TaCWI-5D was significantly associated with higher thousand kernel weight(TKW),lower plant height(PH),earlier heading date(HD)and earlier maturity date(MD)in 348 Chinese modem cultivars grown in multiple environments.Geographic distributions and changes over time of favored haplotypes showed that Hap-5D-C was the major haplotype in modem cultivars and was strongly positively selected in six major wheat production regions worldwide.However,selection for haplotypes at TaCWI-4A was not so evident,possibly due to balancing effects of the two haplotypes on TKW and grain number per spike(GN).In rainfed production regions,Hap-4A-C was favored because it brought more seeds,but in well irrigated conditions,Hap-4A-T was favored in modem breeding because of higher TKW.Evolutionary analysis among wheat and its relatives showed that genetic diversity of TaCWI genes on chromosomes 4A and 5D declined dramatically in progression from the diploid level to modem polyploid cultivars.There was strong allelic selection in polyplodization,domestication and breeding.
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