小麦灌浆后期青枯骤死与体内活性氧代谢关系的研究

Study on Relationship between Green Wilt and Metabolism of Active Oxygen of Wheat Plants during the Late Filling Peroid

小麦灌浆后期遇到“V”字型温度剧烈变化,可导致旗叶的还原型谷跳甘肽(GSH)、还原型抗坏血酸(ASA)含量下降,过氧化氢酶(CAT)活性降低,膜脂过氧化产物丙二醛(MDA)含量增加,细胞膜透性增大,外部形态表现为青枯骤死症状,千粒重明显降低.“V”字型温度变化导致体内活性氧清除能力降低,膜脂过氧化作用加剧,可能是造成小麦灌浆后期青枯骤死的重要生理原因.

Wheat plants usually wilt suddenly when 'V type temperature conditions occurred during the late filling peroid. The phenomenon which causes obvious decrease in 1000-kernel weight is closely correlated with the decrease of the ability of scavenging active oxygen. 'V' type tempera-ture during the late filling peroid results in the rapid decrease of the contents of reductive glu-tathione and ascorbic acid and activity of catalase, the cumulative increase of the content of mal-ondialdehyde and permeability of cell membrane (electrolyte leakage percent) of the flag leaf. It is inferred that the green wilt of wheat plants may be the consequence of rapid membrane deteriora-tion due to disorder in the metabolism of active oxygen and the exacerbation of lipid peroxidation under the 'V' type temperature conditions during the late filling peroid.