Genetic Mechanism of Dominant Earliness in Kefeng A,a New Rice Cytoplasmic Male Sterile Line
Genetic Mechanism of Dominant Earliness in Kefeng A, a New Rice Cytoplasmic Male Sterile Line作者机构：Rice Research Institute Jiangxi Academy of Agricultural Sciences Nanchang 330200 China State Key Laboratory for Crop Genetics and Germplasm Enhancement Nanjing Agricultural University Nanjing 210095 China
出 版 物：《Rice science》 (水稻科学（英文版）)
年 卷 期：2009年第16卷第4期
页 面：267-273页
基 金：Major Scientific and Technological Innovation Project of Jiangxi Province (20061 G0100300)
主 题：dominant earliness heading time genotype genetic mechanism cytoplasmic male sterile line rice
摘 要：Kefeng A is an early maturing indica cytoplasmic male sterile （CMS） line of rice. Combinations derived from Kefeng A and late maturing indica restorer lines showed dominant earliness to various extents. To understand the genetic basis of dominant earliness, the genotype of photoperiod-sensitive genes in Kefeng A was analyzed using a complete set of heading time near isogenic lines （NILs） EGO to EG7, ER, LR, T65, T65E^b, T65E^bm, T65m, NIL（Hd1） and NIL（Hd4）. Results indicated that Kefeng A contained two dominant photoperiod-sensitive alleles E1 and Se-1^U on E1 and Se-1 loci, respectively, and the genotype of photoperiod-sensitivity genes for heading time in Kefeng A was E1E1e2e2E3E3Se-1^USe-1UEf-1Ef-1. Based on the detected heading time genotype, in combination with the heading time of Kefeng A and the early maturing phenomenon in its derived F1 hybrids, it is speculated that Kefeng A might carry a dominant inhibitor gene Su-E7 for the dominant photoperiod- sensitive gene E1, and a recessive inhibitor gene i-Se-1 for another dominant photoperiod-sensitive gene Se-1. The reason why F1 hybrids from Kefeng A exhibited early maturing was hereby analyzed and the breeding value of dominant earliness related genes in Kefeng A was discussed.
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