Effects of a Plant Growth Regulator, Prohexadione Calcium (BX-112), on the Elongation of Rice Shoots Caused by Exogenously Applied Gibberellins and Helminthosporol, Part II |
| |
Authors: | Kamiya Yuji; Kobayashi Masatomo; Fujioka Shozo; Yamane Hisakazu; Nakayama Ishizue; Sakurai Akira |
| |
Institution: | 2The Institute of Physical and Chemical Research, Wako-shi Saitama, 351-01 Japan
4Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-ku Tokyo, 113 Japan
5Life Science Research Institute, Kumiai Chemical Industry Co., Ltd. Kikugawa-cho, Ogasa-gun, Shizuoka, 439 Japan |
| |
Abstract: | Prohexadione calcium (BX-112) is a novel plant growth regulatorthat inhibits the late stages of the biosynthesis of gibberellinsin plants. Fourteen kinds of gjbberellin, helminthosporol and'helminthosporic acid were applied simultaneously with BX-112to rice seedlings (Oryza sativa L. ), and their growth-promotingactivities in terms of shoot elongation were examined. The growth-promotingactivities of GA1, GA4, GA18, GA22, GA23, GA38, helminthosporoland helminthosporic acid were not inhibited by BX-112, but thoseof GA5, GA9, GA15, GA19, GA20, GA31, GA44 and GA53 were inhibited.These results suggest that 3ß-hydroxylation is animportant and necessary step in the biosynthesis of gibberellinsthat promote shoot elongation in rice seedlings. The weak promotionof shoot elongation by GA22 in the presence of BX-112 suggeststhat the effect of a hydroxyl group at C-18 of GA22 might beable to mimic the effect of the 3ß-hydroxyl groupof GA1. Helminthosporol and helminthosporic acid may promotethe shoot elongation of rice by mimicking physiologically activegibberellins and not by stimulating their biosynthesis.
1Part I is the previous paper by Nakayama et al. (1990a)
3Present address: Frontier Research Program RIKEN, Wako-shi,Saitama, 351-01 Japan. (Received June 26, 1991; Accepted September 4, 1991) |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|