不同抗寒性冬小麦叶鞘质膜的稳定性表现

为了解叶鞘质膜稳定性与小麦抗寒性的关系,以返青率不同的4个冬小麦品种(系)为材料,研究寒地冬小麦越冬期叶鞘质膜稳定性变化及其影响因素。结果表明,低温下,冬小麦叶鞘相对电导率与自由水和总水分含量呈显著正相关,丙二醛含量与SOD和POD活性、AsA含量呈显著正相关;封冻后,抗寒性强的冬麦品种(系)的SOD活性和GSH含量显著高于抗寒性弱的品种(系)。在深度封冻期保持叶鞘质膜稳定性有助于增强冬小麦抗寒性。

Plasma Membrane Stability in Leaf Sheath of Cold area Winter Wheat with Different Cold Resistance

Four varieties of winter wheat with different return green rates were used to analyze the plasma membrane stability and the factors that affect cold area winter wheat during winter. The results show that electrical conductivity reflects the degree of plasma membrane damaged under low temperatures was significantly correlated with the free water and the total water content. The malondialdehyde (MDA) content, which reflects the degree of membrane peroxidation, was very significantly correlated with superoxide dismutase (SOD), peroxidase, and ascorbic acid.After freezing period, the SOD activity and glutathione (GSH) content of the winter wheat varieties were relative to their cold resistance. During the deep freezing period, the MDA stability, SOD, GSH, and total water and free water content may be used to identify the cold resistance of winter wheat varieties.