Effects of Inabenfide on the Growth of Roots in Rice Plants (Oryza sativa L.)

Japanese Journal of Crop Science

Noriyuki TANAKA¹  Seizaburo SAKAI¹  Susumu ARIMA¹  Jiro HARADA¹ 

关键词: Branch root;    イナベンフィド;    Growth regulator;    イネ(Oryze sativa L.);    Inabenfide;    根系;    Rice (Oryza sativa L.);    生長調節剤;    Root system;    短稈化;    Shortening of culm length.;    分枝根;   

DOI  :  10.1626/jcs.61.56

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Effects of Inabenfide (SERITARD), a gibberellin biosynthesis inhibitor, on root growth of rice plants was examined in main stems of cv. 'Reiho' grown under field cndition in 1989 and per hill and per culm basis in cv. 'Koshihikari' grown in pots in 1990. The chemical, 5 kg per 10 a equivalent, was applied under flooded condition, 40 days and 35 days before heading stage in 1989 and in 1990, respectively. Plant height and culm length were significantly shortened and grain yield increased by the treatment. As for the yield components, the number of heads per m2, percentage of ripened kernels and weight per thousand kernels increased, although the number of kernels per head decreased. The total number of primary roots increased in the main stems treated by Inabenfide. The number of 'stunted' roots, however, also increased and, as a consequence, that of elongated primary roots tended to decrease. On the contrary, the total length of roots including that of branch roots exhibited a remarkable increase by the treatment. The effect of Inabenfide on branch root formation was also examined in the work. The ratio, the length of branch roots per unit length of primary root, increased by the treatment, although the root dry weight per unit length of total roots decreased, both indicating that the branch root formation was markedly promoted. Futhermore, the low ratio of shoot dry weight per total length of roots was noticed in treated plants. In conclusion, it was assumed that Inabenfide affects the number of culm and formation of roots, especially of branch root, and thus the total length of roots per hill might increase owing synergistically to both the effects. Moreover, it was thought that the effects would change the construction of rice plant to a more favorable one for producing high grain yield, by a relatively massive root system.

【 授权许可】

Unknown