水稻新资源温敏核不育系长S的遗传学研究

Genetical Study on a New Thermosensitive Genic Male Sterile (TGMS) Line Chang S in Rice

长S是来自普通野生稻与籼稻珍珠矮杂交后代的温敏核不育系。以长S与中浙B、R608等配组的F1和F2为材料,对其育性进行观察。结果表明,所有F1均为正常可育,F2群体中可育株数和不育株数经卡平方测验符合3∶1的理论分离比例,说明长S的育性受1对隐性核基因控制。以长S与HN5S、C815S、广占63S、湘陵628S及HD9802S的F1为材料,并进行育性观察。结果表明,长S与HN5S的F1为正常可育,而长S与C815S等其余4个不育系的F1表现为不育,这说明长S与HN5S的不育基因位点不等位,而与C815S等4个不育系的不育基因位点等位。

Chang S is a new rice thermo-sensitive genic male sterile （TGMS） line obtained from the offsprings of the cross between Oryza rufipogon L. and indica Zhenzhu＇ai. The sterility segregation and its genetic pattern of Chang S was analyzed based on the investigation of the fertility of the individuals in Fland F2populations from the crosses of Chang S and indiea conventional varieties such as Zhongzhe B ,R608, and so on under natural long day- length and high temperature conditions in Ji＇an in 2011. The results indicated that the sterility of Chang S was con- trolled by one pair of recessive nuclear genes. Fertilities of F1 generations of the crosses between Chang S and other five photo or thermo-sensitive genic male sterile（ P ＆ TGMS）lines such as HN5S, C815S, Guangzhan 63S, Xian- gling 628S and HD9802S were investigated under the same natural conditions in Ji＇an in 2011. The results showed that the sterility gene in Chang S was nonallelic to that in the photo-sensitive genie male sterile（PGMS）line HN5S, and allelie to those in thermo-sensitive genie male sterile（TGMS）lines such as C815S, Guangzhan 63S, Xiangling 628S and HD9802S.