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在不同温度下,抗冷性不同的水稻品种苗期叶片离子渗漏量有显著差别。抗冷性强的品种含自由氨基基团的类脂比不抗冷品种少,而磷脂、中性脂和糖脂则较多,其脂肪酸不饱和指数提高。线粒体膜结合ATP酶活性的Arrhenius图表明,抗冷性强的秋光,在5～25℃呈线性关系,在25～30℃处有一温度折点;抗冷性弱的品种红410温度折点落在10℃;抗冷性居间的早籼78130,密阳23温度折点落在15℃。这种酶活性变化与这4个品种苗期田间生长的抗冷性和耐热性的表现完全吻合,同时也反映根系活力与秧苗抗冷性密切相关。
At different temperatures, there were significant differences in leaf ion leakage at seedling stage between different cold tolerance rice varieties. Cold-tolerant varieties with free amino groups of lipid-resistant than cold-resistant varieties less, and phospholipids, neutral lipids and glycolipids are more fatty acid unsaturation index increased. The Arrhenius plot of mitochondrial membrane-bound ATPase activity showed that the cold-resistant autumn light had a linear relationship at 5-25 ° C and a temperature break at 25-30 ° C; the red cold-410 variety At 10 ℃; cold resistance intervening early Indica 78130, Mieyang 23 temperature break point at 15 ℃. The change of this enzyme activity is completely consistent with the performance of cold tolerance and heat tolerance of the four cultivars at the seedling stage, and also shows that the root activity is closely related to the cold resistance of the seedlings.