关键词: 水稻[49E], 细胞核雄性不育[45CC], 遗传分析[45CC], 光温敏核不育, 主基因, 遗传背景

Abstract: S, 2877S, 8902S and W6154S were indica genic male-sterile (GMS) lines detived from japonica photo-sensitive genic male-sterile (PGMS) line Nongken 58S.In the present study, 2877S and 8902S expressed PGMS.but 2558S and W615 4S expressed thermo-sensitive genic male-sterility (TGMS).The ranking of "the critical fertility point" (temperature)[14]was W6154S > 8902S > 2877S and Nongken 58s (ck)>2558S.F₁ progenies of the crosses between the indica GMS lines and 4 conventional varieties were all normally fertile and there, were not obvious differences in fertility between reciprocal cross.Under ling-day and little lower temperature conditions in Yaan City, sichuan (30°N, 610m above sea level) in summer, F₂ and BF₁ progenies (GMS lines as recurrent parents) of the crosses between 2558S or 2877S and the 4 conventical varieties segregated into fertile and sterile classes basically in ratios of two pairs of genes.F₂ and BF₁ of the crosses between 8902S or W6154S and the 4 conventional varieties segregated into fertile and sterile classes in different ratios, which of some combinations zegregated in ratios of two pairs of genes, but other combinations segregated into obviously more fertile plants and less sterile Plants, Based on the results obtained, we propose here that male-sterility of the 4 GMS lines Was controlled by two pairs of independent recessive genic major-genes, but their segregation expressions were influenced very greatly genetic background and photoperiod and temperature conditions.

Key words: LOWLAND RICE, NUCLEAR MALE STERILITY, GENETIC ANALYSIS.MAJOR GENE, GENETIC BACKGROUND, PHOTO-THERMO-SENSITIVE GENIC MALESTERILITY