Genotypes of Heading Date of Middle Indica Rice in the Mid-lower Region of the Yangtze River  

作　　者：Jun-Feng Xu Ling Jiang Xiang-Jin Wei Wen-Wei Zhang Shi-Jia Liu Liang-Ming Chen Lin-Guang Luo Jian-Min Wan 

机构地区：[1]State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China [2]Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China

出　　处：《Journal of Integrative Plant Biology》2007年第12期1772-1781,共10页植物学报（英文版）

基　　金：Supported by the High-Tech Research and Development(863) Program of China;the National Natural Science Foundation of China(30571142);the High Technology Program of Jiangsu Province(BG2004303 and BG2006301) and PCSIRT

摘　　要：Middle indica cultivars are planted in the middle to lower regions of the Yangtze River. Hybrid combinations with these cultivars have a high yield potential but the presence of late-transgressive-segregants limits the further exploitation of heterosis. To understand the genetic basis of the heading date in these middle maturing cultivars, we carried out a genetic analysis of 10 typical middle-season cultivars using a number of heading date isogenic lines under both long and short day conditions. The results showed that Teqing, 752, CDR22, Bo B, 9311 and 11-32B carry two photoperiod sensitive genes E1 or Se.1 and E3, and Teqing, 752 and CDR22 carry a dominant early-heading gene Ef-1 while Bo B, 9311 and 11-32B carry a recessive late-heading gene ef-1. Based on the findings of the present and previous works on Guichao 2, Minghui 63, Nanjing 11 and Pei＇ai64S, it was concluded that all of these middle indica cultivars carried the recessive allele hd2, which could inhibit the expression of El or Se.1, and they formed rational combinations of genotype for heading date during a long period of evolution. The effects of the different combinations of genotype for heading date on rice cultivation and extension were discussed, and genetic basis of broad adaptability of hybrid middle indica cultivars was analyzed.Middle indica cultivars are planted in the middle to lower regions of the Yangtze River. Hybrid combinations with these cultivars have a high yield potential but the presence of late-transgressive-segregants limits the further exploitation of heterosis. To understand the genetic basis of the heading date in these middle maturing cultivars, we carried out a genetic analysis of 10 typical middle-season cultivars using a number of heading date isogenic lines under both long and short day conditions. The results showed that Teqing, 752, CDR22, Bo B, 9311 and 11-32B carry two photoperiod sensitive genes E1 or Se.1 and E3, and Teqing, 752 and CDR22 carry a dominant early-heading gene Ef-1 while Bo B, 9311 and 11-32B carry a recessive late-heading gene ef-1. Based on the findings of the present and previous works on Guichao 2, Minghui 63, Nanjing 11 and Pei＇ai64S, it was concluded that all of these middle indica cultivars carried the recessive allele hd2, which could inhibit the expression of El or Se.1, and they formed rational combinations of genotype for heading date during a long period of evolution. The effects of the different combinations of genotype for heading date on rice cultivation and extension were discussed, and genetic basis of broad adaptability of hybrid middle indica cultivars was analyzed.

关 键 词：heading date inhibitor middle-season rice （Oryza sativa） photoperiod-sensitive gene tester lines. 

分 类 号：S511[农业科学—作物学]