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《Journal of Agricultural Biotechnology》 2007-05
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Identification of QTLs for Seed Setting Rate of Rice in Eight Various Environments

CHEN Qing-quan,YU Si-bin,LI Chun-hai,MOU Tong-min(National Key Laboratory of Crop Genetic Improvement,National Plant Gene Research Centre(Wuhan),Huazhong Agricultural University,Wuhan 430070,China)  
To understand the genetic basis of seed setting rate(SSR)in rice,two breeding lines(Oryza sativa ssp.indica),T226 with higher and stable SSR and T219 with lower and fluctuated SSR in different natural conditions,were used for constructing recombinant inbred lines(RILs).Genotype by environment(G×E)interaction and QTLs for SSR were analyzed using the population with 202 RILs under eight various environments.Significant G×E interaction for SSR in rice was detected using AMMI statistical model,and the IPCA1 and IPCA2 of G×E interaction explained a total of 57.6% of the variation.QTLs controlling the SSR were detected by interval analysis methods.Seventeen QTLs on 9 chromosomes were identified across eight environments,totally explaining the phenotypic variances from 4.6% to 35.7%,respectively.Most of the QTLs,each explaining small part of phenotypic variances and interacting with environment,were detected in one or two environments,and their alleles for increasing the SSR were derived from T226.However,the QTL(MRG5959 ~MRG2180)on chromosome 3 was detected across six various environments.It explained maximum phenotypic variances in each detected environment and its allele for increasing the SSR was derived from T226.Another QTL mapped between markers RM592 and RM169 on chromosome 5 was detected in five various environments and its allele increasing the SSR was derived from T219.
【Fund】: 国家自然科学基金创新群体(No.30321005);; 国家(948)项目(No.2006-G1);; 湖北省科技攻关项目(No.2006AA201A01)资助
【CateGory Index】: S511
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