A Mutant RM109 of Rice (Oryza sativa L.) Exhibiting Altered Lateral Root Intiation and Gravitropism

Japanese Journal of Crop Science

Zaibin HAO¹  Masahiko ICHII¹ 

关键词: 2;    4-D resistance;    2;    4-D耐性;    Gravitropism;    イネ;    Lateral root;    重力屈性;    Mutant;    無側根;    Oryza sativa L.;    Rice;    突然変異体;    Root;    æ ¹;   

DOI  :  10.1626/jcs.68.245

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We screened a large population of rice (Oryza sativa L., cv. Oochikara) M2 seeds treated with NaN3 to select mutants resistant to exogenously applied 2, 4Dichlorophenoxyacetic acid (2, 4-D). A resistant line, RM109, was idenified, and its resistance to 2, 4-D was contralled by a dominant single gene. Its seedlings had altered lateral root production, root gravitropism, and several root hairs, but no significant difference was observed between RM109 and the wild type in plant heigh, number of roots, and seminal root length. It was shown that the pericycle cell number in the root of RM109 mutant was 70% to 80% of that of the wild type, indicanting that the deficient lateral root production was mainly based on irregular cell division. No difference in number of amyloplasts was fonud between the two. However, the amyloplast size in the columella cells of RM109 root cap was 50% to 60% of the wild type. This result suggests root agravitropism of the mutant.

【 授权许可】

Unknown