高温胁迫对扬稻6号剑叶生理特性的影响

Influence of High Temperature Stress on Some Physiological Characteristics of Flag Leaves of Rice Variety Yangdao 6

以扬稻6号为试验对象,通过在人工气候箱中进行高温处理,研究抽穗期高温胁迫对水稻剑叶生理特性的影响,旨在深入探讨高温对水稻的伤害机理。研究表明:高温胁迫加速剑叶叶绿素丧失,使超氧化物歧化酶(SOD)活性以及抗坏血酸(ASA)、还原型谷胱甘肽(GSH)、脯氨酸(Pro)、可溶性蛋白质和可溶性糖含量明显降低,并使细胞膜透性和丙二醛(MDA)含量显著增加。说明高温可加速叶片衰老,并影响植物体其他内源物质的变化,且有可能进一步降低作物光合能力。

The influence of the high temperature stress on some physiological characteristics of flag leaves of the rice variety Yangdao 6 during the heading stage was studied. The results showed that the loss of the chlorophyll in the flag leaves was accelerated under high temperature stress, while the activity of superoxide dismutase （SOD） , and the content of the ascorbic acid （ASA）, the glutathione （GSH） , the proline （Pro）, the soluble protein and the soluble sugar significantly reduced by high temperature stress as well. Whereas the content of the electrolyte leakage and the malondialdehyde （MDA） significantly increased. The high temperature stress accelerated the senescence of leaf and caused the changes of other inner source substances, and then could reduce photosynthesis capability of the crop.