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中国农学通报

中国农学通报 ›› 2009, Vol. 25 ›› Issue (24): 225-230.

所属专题： 水稻

• 农学 农业基础科学 • 上一篇    下一篇

硅营养对UV-B辐射条件下水稻酚类代谢的影响

吴杏春,陈裕坤,李奇松,方长旬,熊 君,林文雄   

  • 收稿日期:2009-09-23 修回日期:2009-10-15 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:

    水稻对UV-B辐射胁迫响应的分子机理研究

Effects of silicon nutrition on phenolics metabolization of rice ((Oryza sativa L.) exposed to enhanced ultraviolet-B

  • Received:2009-09-23 Revised:2009-10-15 Online:2009-12-20 Published:2009-12-20

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摘要：

本研究在不同硅营养条件下，探讨了UV-B辐射增强对两个供试水稻品种(Lemont和Dular)硅营养特性和酚代谢物质的影响。结果表明：(1)在缺硅营养和UV-B辐射胁迫下，Lemont的硅营养吸收能力和生理利用率都比Dular强。（2）不同硅营养条件下，UV-B辐射胁迫促使Lemont叶片的PAL、PPO、 POD、CAT活性增强，总酚、类黄酮和绿原酸含量升高，而可溶性蛋白质含量降低；上述指标在Dular叶片中也表现出相同的变化趋势。但在缺硅营养和UV-B辐射共同胁迫下，Lemont表现出较强的酚类合成能力。（3）硅营养有利于水稻酚类代谢物质的积累，以减少UV-B辐射的伤害。综上所述，Lemont与Dular之间硅营养特性的不同，可能是引起两个供试水稻的酚类代谢差异，从而表现出对UV-B辐射抗性不同的原因之一。

关键词: 毛竹, 毛竹, 种子萌发, 温度, 光照, GA3

Abstract:

The silicon nutrition characteristics and phenolics metabolism of two tested rice accessions grownin different concentrations of silicon nutrition under ultraviolet-B (UV-B) radiation treatment were investigated. The results were summarized as followings: (1) Under the condition of silicon-absent nutrition and UV-B radiation,enhancement, Lemont showed stronger capability of root uptake to silicon (RUS) and leaf use efficiency of silicon （LUES) than that of Dular. （2）The activities of PAL、PPO、POD、CAT and the contents of total hydroxybenzene、flavonoid、chlorogenic acid of leaves in Lemont with different silicon nutrition exposed to enhanced UV-B radiation were increased，while the content of dissoluble proteins were reduced, and the same was true in Dular. But hydroxybenzene metabolism in Lemont were stronger than that in Dular under the two cooperation stresses. (3) The accumulation of phenolic substances was induced by silicon nutrition, which would reduce the damage of UV-B radiation stress. The result suggested that the different characterics of silicon nutrition in the two rice accessions might be due to the diversity of phenolics metabolism, consequently result in different UV-B resistance in the two rice accessions.