水稻核不育系6442S-7显性早熟性的遗传分析  

Genetic Analysis of Dominant Earliness of Rice Genie Male Sterile Line 6442S-7

作　　者：邓晓建[1] 周开达[1] 李仁端[1] 李平[1] 黄国寿[1] 淳泽[1] 

机构地区：[1]四川农业大学水稻研究所,温江611130

出　　处：《Acta Genetica Sinica》2001年第7期628-634,共7页

基　　金：国家自然科学基金(批准号:30070469)资助项目

摘　　要：研究了早籼核不育系６４４２５－７与明恢６３等１６个中迟熟品种杂交Ｆ１及其部分组合Ｆ２和Ｂ１Ｆ１的抽穗期遗传，结果表明，６４４２Ｓ－７具有完全显性早熟特性，主要受 ２对无连锁关系的显性早熟基因控制。同时，还对ＩＲ６８，献国、９３１１和ＢＧ１６３９等其他４个迟熟品种与６４４２Ｓ—７杂交Ｆ１和Ｆ２代，以及三交Ｆ１代的抽穗期进行遗传分析，发现ＩＲ６８、献国、９３１１和ＢＧ１６３９等４个迟熟品种均含１对等位的不完全显性抑制基因，可部分抑制６４４２Ｓ—７显性早熟基因的表达。认为６４４２Ｓ—７携带的显性早熟基因对水稻遗传改良具有重要的应用价值。F1 Progenies of a genie male sterile and early maturing indica line 6442S-7 crossed with sixteen medium or late maturing varieties, such as Minghui 63, shared the same heading dare as 6442S-7 under long day and short day, suggesting that 6442S-7 has completely dominant earliness. Segregation of heading dates of the F2 and B1F1 populations indicated that the earliness of 6442S-7 is mainly controlled by two dominant major genes. Whereas, heeding dares of F1 Progenies of 6442S-7 crossed with other four fare maturing varieties, i.e. IR68, Xianguo, 9311, and BG1639, closed to the mid-parent value under long day. In F2 populations of 6442S-7 crossed with each of the four late maturing varieties, F1 from three-way crosses between 6442S-7 and each F1 of Minghui 63 crossed with each of the four late maturing varieties, and F1 from three-way crosses between 6442S-7 and each F1 of crosses between each two of the four late maturing varieties, segregation of heading dates showed that an incompletely dominant allelic suppressor for the dominant earliness of 6442S-7 existed in the fare maturing varieties, IR68, Xianguo, 9311, and BG1639. It is considered that dominant earliness genes harbored in 6442S-7 have splendid future in rice improvement.

关 键 词：水稻 生育期 早熟性 显性早熟基因 抑制基因 遗传分析 核不育系 

分 类 号：Q943[生物学—植物学]