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蓝光对水稻幼苗生长及内源激素水平的影响

余让才, 潘瑞炽

华南师范大学生物系. 广东, 广州 510631

摘要

与白光对照相比,蓝光明显抑制水稻幼苗的生长,并使幼苗体内的自由态IAA、GA_(1)、玉米素和二氢玉米素含量下降,ABA含量和乙烯释放量则明显增加。 说明蓝光对水稻幼苗生长的影响与其体内激素状况有关。

关键词： 蓝光; 水稻; 生长; 内源激素

Effects of blue light on the growth and levels of endogenous phytohormones in rice (Oryza sativa) L. seedlings

Yu Rangcai, Pan Ruichi

Department of Biology,South China Normal University. Guangzhou 510631, Guangdong

Abstract

There are more evidences that cell elongation is affected by phytohormones and light.Researchs on the interaction between red light and phytohormones were done and made a hypothesis that phytohormones may be the second messenger in light act. But so far there is no reports about the interaction between blue light and phytohormones. Long-term effects of pure blue light on the growth and levels of endogenous phytohormones were investigated.Compared with white light or darkness, blue light suppressed the growth of rice seedlings, increased the leaf angle and made leaf unfolding earlier and faster. Seedlings grown under long-term blue light irradiation had lower concentrations of endogenous free IAA, GA_(1),zeatin and dihydrozeatin and an increase in ABA content and rate of ethylene release.Therefore,the morphological changes of seedlings treated with blue light may be the resulted from the changes of endogenous phytohormone levels in the seedlings. The activity of IAA oxidase was increased in blue light-treated seedlings, it could be suggested the decrease of endogenous free IAA level is due to the augmented oxidation by increased IAA oxidase activity.

Key words: Blue light;Rice;Growth;Endogenous phytohormones

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引用本文：

余让才, 潘瑞炽. 蓝光对水稻幼苗生长及内源激素水平的影响[J]. 生理学报 1997; 49 (2): .

Yu Rangcai, Pan Ruichi. Effects of blue light on the growth and levels of endogenous phytohormones in rice (Oryza sativa) L. seedlings. Acta Physiol Sin 1997; 49 (2): (in Chinese with English abstract).