Genic analyses of reduced culm number mutants induced by gamma-ray irradiation in rice [Oryza sativa]
1993
Takamure, I. (Hokkaido Univ., Sapporo (Japan). Faculty of Agriculture) | Kinoshita, T.
Futsuhara and Yamaguchi (1963) reported induced mutants showing reduced culm number in rice. Following this, four kinds of similar mutants, N-133, N-174, N-176 and N-175, were also found and it was revealed that these were caused by single recessive genes, rcn-1, rcn-2, rcn-3 and rcn-4. In addition, three of the genes, rcn-1, rcn-3 and rcn-4, were found to be thermosensitive and their expression was restricted only under low temperature conditions. In this paper, the authors used three new mutants, N-185, N-186 and N-187 all showing reduced culm number, for gene analyses. These mutants were induced by gamma-ray irradiation from cv. Shiokari. It was indicated that single recessive genes were responsible for the reduced culm number in N-185, N-186 and N-187. Allelism tests showed that the mutant gene from N-185, designated as rcn-5(t), occupied a different locus from rcn-1, rcn-2, rcn-3 and rcn-4. The locus of gene from N-186 was different from rcn-1, rcn-3, rcn-4 and rcn-5(t). In the linkage analyses, it was found that rcn-5(t) linked with C (Chromogen for anthocyanin coloration) belonging to chromosome 6. Character expressions of N-185, N-186 and N-187 were compared with the original strain under paddy field and plastic house conditions. Both N-185 and N-187 showed reduced culm numbers and short culms only under the paddy field condition. In contrast to this, the growth was restored to nearly normal under the plastic house condition. It was concluded that N-185 and N-187 were sensitive to low temperature. In the case of N-186, no difference was observed between the low and high temperature conditions
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