Effects of a Plant-Growth Regulat or, Prohexadione-Calcium (BX-112), on the Endogenous Levels of Gibberellins in Rice |
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Authors: | Nakayama Ishizue; Kobayashi Masatomo; Kamiya Yuji; Abe Hiroshi; Sakurai Akira |
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Institution: | 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 |
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Abstract: | The effects of the plant-growth regulator, prohexadione-calcium,on the levels of the endogenous gibberellins in rice shootswere measured by GC-SIM using 2H-labeled gibberellins as internalstandards. The compound was applied at the 4-leaf stage andshoots were harvested 5 and 12 days after treatment. Plant lengthwas reduced to 78% and 66%, respectively, relative to controlby application of the compound at 1 and 30 mg m2, whenplant length was measured 12 days after treatment. The levelof GA, was reduced to 36% and 18%, respectively, relative tocontrol in the treated plants. The levels of GA19and GA20 increasedbut that of GA44 was reduced in the treated plants. The levelof GA53 was unchanged. These results suggest that primary modeof action of the compound in vivo is the inhibition of the 3ß-hydroxylationof GA20 to GA1 and further support the hypothesis that GA1 notGA19 nor GA20 is active in promoting shoot elongation in rice.
3Present address: Frontier Research Program, RIKEN, Wakoshi,Saitama, 351-01 Japan. |
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