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本文将十八个不同抗寒性水稻品种幼苗在零度以上低温下对组织持水力、叶绿素含量、细胞液外渗量和过氧化物酶活性进行了研究。结果表明:低温使组织内自由水含量降低,束缚水含量相应提高。自由水的丧失量、束缚水的上升量与品种的抗寒性呈反比。低温处理后,叶绿素含量随品种抗寒性减弱而降低;细胞液外渗量都比对照高,并且抗寒性弱的外渗量大于抗寒性强的品种,籼稻大于粳稻;过氧化物酶活性处理比对照有明显的提高,而抗寒性强的品种上升幅度比抗寒性弱的品种低。这些品种间表现出的生理特性,可作为比较不同抗寒性品种生理生化指标的依据,并可供引种和育种参考。
In this paper, the water holding capacity, chlorophyll content, extracellular fluid infiltration and peroxidase activity of 18 cold-resistant rice cultivars at temperatures above zero were studied. The results showed that: low temperature to reduce the content of free water in the tissue, bound water content increased accordingly. The loss of free water and the increase of irreducible water are inversely proportional to the cold resistance of the cultivars. After low temperature treatment, the chlorophyll content decreased with the decreasing of cold tolerance of the cultivars. The extravasation amount of the cytosol was higher than that of the control, and the extra-osmotic amount of the cold hardiness was greater than that of the cold-resistant ones. The indica rice was bigger than the japonica rice. Active treatment significantly increased compared with the control, while cold hardiness varieties rose less than cold hardiness varieties. The physiological characteristics exhibited by these varieties can be used as a basis for comparison of physiological and biochemical indexes of different cold-resistant varieties, and can be used for reference for introduction and breeding.