^(60)Co-γ射线诱发的籼型温敏核不育水稻叶色突变系变异分析

Analysis of Variation in Thermo-sensitive Genie Male Sterile Leaf Color Mutant Lines Induced from Indica Rice (Oryza sativa L. ) by 60Co-Y Irradiation

^(60)Co-Υ射线诱发的8个籼型温敏核不育系水稻叶色突变系可分为三种类型,即叶色突变高温表达型、低温表达型及温钝型。对温钝型3个突变系研究发现,该性状由单一隐性基因控制,其农艺性状除LCM6外与对照2177s相似或有所改观,育性转换特性和配合力也与对照相仿,对杂种优势无细胞质负效应。与杂交种“汕优63”混合播种时,叶色标记性状表达明显,幼苗竞争能力明显弱。

8 strains of leaf color mutants induced by 60Co-γ irradiation from Thermo-sensitive genie male sterile line 2177s, were obtained. According to differences in their response to temperature , these lines were classified into three types (Table 1), namely those whose mutated leaf color traits expressed under high temperatures, under low temperatures and under all temperatures tested. Genetic analysis of three temperature-insensitive lines indicated that all of the mutated traits were controlled by a single recessive gene (Table 2). Except LCM6, the agronomic traits of the other two lines were similar to or better than those of 2177s. Meanwhile investigation on combining ability and spikelet fertility showed that many lines maintained the TGMS characteristics and combining ability like 2177s. When mixed with the seeds of hybrid rice 'Shanyou 63', the seedlings with leaf color marker could be distinguished easily, and the seed Ling competing ability was significantly lower than that of the hybrid rice 'Shanyou 63'.