香稻不同生育时期叶片SOD·POD酶活性及MDA含量对播期的响应

Responses to SOD Activity,POD Activity and MDA Content in the Leaves of Aromatic Rice in Different Growth Stages to Sowing Date

[目的]探讨香稻抗氧化酶的作用机制及播期调控。[方法]以香稻桂香占和农香18为试验材料,研究不同播种期对香稻SOD活性、POD活性和MDA含量的影响。[结果]播期对香稻SOD活性的影响存在品种差异。早、晚季香稻的POD活性均呈先下降、后上升的趋势。早、晚季香稻的MDA含量均呈上升趋势。香稻在孕穗期主要是SOD在发挥抗氧化作用,在齐穗期和成熟期由SOD和POD协同起作用。[结论]在生产实践中可通过调整播期使香稻抗氧化酶活性维持在较高水平,以延缓叶片生理功能衰退。

[Objective] The research aimed to discuss the mechanism of antioxidant enzymes and regulation of sowing date of aromatic rice.[Method]Taking aromatic rice variety Guixiangzhan and Nongxiang 18 as test materials,the effects of different sowing date on SOD activity,POD activity and MDA content of aromatic rice were studied. [Result]The effects of different sowing date on SOD activity of aromatic rice had variety difference. POD activities of both Guixiangzhan and Nongxiang 18 in early season and late season showed first descending and then rising trends. MDA content in aromatic rice in early season and late season all showed the rising trends. SOD mainly played an antioxidant effect at booting stage,and SOD and POD worked together at full heading stage and maturity stage. [Conclusion] In the practical production,the activities of antioxidant enzymes could be kept at higher levels by adjusting sowing date,in order to delay leaf physiological function declining.