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1990•Plant and Cell PhysiologyRequires access

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 Nakayama, Takeshige Miyazawa, Masatomo Kobayashi, Yuji Kamiya, Hiroshi Abe, Akira Sakurai

Open publisher page 79 citations

Abstract

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 3β- and 2β-hydroxylation of GAs, namely steps of activation and inactivation, respectively.

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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 3β- and 2β-hydroxylation of GAs, namely steps of activation and inactivation, respectively.

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Available abstract

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 3β- and 2β-hydroxylation of GAs, namely steps of activation and inactivation, respectively.

Key concepts: Oryza sativa, Gibberellin, Shoot, Elongation, Seedling, Botany, Poaceae, Biology

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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 — Research Paper | ScholarLens