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Plant and Cell Physiology, 1990, Vol. 31, No. 2 195-200
© 1990

Article

Effects of a New Plant Growth Regulator Prohexadione Calcium (BX-112) on Shoot Elongation Caused by Exogenously Applied Gibberellins in Rice (Oryza sativa L.) Seedlings

Ishizue Nakayama1, Takeshige Miyazawa1, Masatomo Kobayashi2, Yuji Kamiya2, Hiroshi Abe1 and Akira Sakurai2

1Life Science Research Institute, Kumiai Chemical Industry Co., Ltd., Kikugawa-cho, Ogasa-gun, Shizuoka, 439 Japan
2The Institute of Physical and Chemical Research Wako-shi, Saitama, 351-01 Japan

The effects of a novel plant growth regulator (PGR) prohexadione calcium (BX-112; calcium 3,5-dioxo-4-propionylcyclohexanecarboxylate) on shoot elongation caused by exogenously applied GA1, GA3, GA4) GA19 and GA20 were investigated in rice (Oryza sativa L. cv. Nihonbare and cv. Tan-ginbozu) seedling test. Depending on the dose, BX-112 reduced shoot elongation in both cultivars caused by GA19 and GA20, but not by GA1. When a high dose of BX-112 (e.g. 250 ng/plant and over) was applied with GA1, or GA4, shoot elongation was even promoted. This promotive effect, however, was not observed with GA3. These results suggest that BX-112 inhibits gibberellin (GA) biosynthesis in the rice plant at the 3ß- and 2ß-hydroxylation of GAs, namely steps of activation and inactivation, respectively.

(Received September 6, 1989; Accepted November 27, 1989)
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