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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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Citing This Article：

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).