UV-B辐射对水稻生长的影响及机理

Effects and Mechanism of UV-B Radiation on Rice Growth

UV-B辐射增强对水稻的生长发育及生理都有不同程度地影响,主要表现在外部形态的变化、光合系统被破坏、抗氧化系统不稳定、内源激素含量的改变、病害加剧、生育期滞后及生物量产量下降等方面。水稻对紫外(UV-B)辐射响应反馈存在着品种差异,通过建立响应指数公式将水稻对UV-B响应敏感性的品种差异进行评估。存在这种品种差异的主要原因包括:水稻的基因差异,生长及生理的差异,生育期和环境背景的差异。水稻对UV响应的机理最主要是诱导类黄酮化合物和花青素的积累以及通过改变自身的形态结构抵御UV辐射。在分析UV-B辐射增强对水稻的影响,以及水稻对UV响应品种差异及机理的基础上,提出水稻与UV-B相互关系的未来的研究方向。

The enhancement of UV-B radiation influences the growth of rice and physiology in different levels, and this performances as chan- ges in morphology, destroyed photosynthetic system, unstable anti-oxidation system, changes of endogenous hormone content, exacerbated rice diseases, decreased biomass, and developmental stage delay. Through the establishment of the response index, we can evaluate the varietal differences in responses of the rice to UV-B radiation. Reasons for such varietal differences were differences in rice gene, physiology and mor- phology, developmental stage and environmental factors. The main mechanism in responses of the rice to UV-B radiation was induction of fla- vonoid compounds and accumulation of anthocyanins. Based on the analysis of the influence of enhanced UV-B radiation to rice, and the varie- tal differences in responses to UV-B radiation and mechanism of rice, the direction of the further research about the relationship between the rice and UV-B was put forward.