Identification of Quantitative Trait Loci (QTLs) for Flowering Time Using SSR Marker in Maize under Water Stress
文献类型: 外文期刊
作者: Xiao, YN 1 ; Li, XH 2 ; Zhang, SH 2 ; Wang, XD 2 ; Li, MS 2 ; Zheng, YL 2 ;
作者机构: 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China; Chinese Acad Agr Sci, Inst Crop Breeding & Cultivat, Beijing 100081, Peoples R China; AMBIONET China Lab, Minist Agr, Key Lab Crop Genet & Breeding, Beijing 100081, Peoples R China; Shanxi Acad Agr Sci, Wheat Breeding Inst, Linfen 041000, Peoples R China
关键词: Zea mays;drought tolerance;SSR;quantitative trait locus (QTL);flowering time;linkage map
期刊名称:KOREAN JOURNAL OF GENETICS ( 影响因子:0.091; 五年影响因子:0.305 )
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收录情况: SCI
摘要: The selection of reduction of anthesis-silking interval (ASI) in maize breeding is an efficient way to develop maize varieties more tolerant to dry growing conditions. Characterization of the quantitative trait loci (QTL) that controlled the floweringtime will be helpful for selection in maize breeding. In this study, flowering time of individuals in a 234 F_2:3 family, derived from the cross between inbred lines X178 and B73, was evaluated under well-watered and water-stressed conditions at the same location. SSR (microsatellite) was used to identify flowering time QTL. The results showed that the broad-sense heritability for male flowering time (MFT), female flowering time (FFT) and ASI were 0.72, 0.72 - 0.74 and 0.40 - 0.42, respectively, and ASI was significantly correlated to FFT. Under water-stressed condition, 9, 6 and 6 QTLs were identified for MFT, FFT and ASI, respectively, and individual QTL accounted for approximately 2.88% - 31.65% of the phenotypic variation. Some QTLs for MFT were mapped overlapping with those for FFT and ASI. One QTL on chromosome 9 (near nc134) had the strongest effect on MFT, FTT and ASI. It was suggested that the epistasis contributed to the phenotypic variation of flowering time.
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