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棉花幼苗子叶 SOD 活性在细胞内的分布是细胞溶质部分活性最高。其次是线粒体,再次是叶绿体。各细胞器 SOD 活性对盐分的敏感程度不同,依次是叶绿体>线粒体>细胞溶质部分。在盐分胁迫初期,棉花幼苗子叶能够维持较高 SOD 活性,但随着盐胁迫强度的增加,棉花幼苗子叶 SOD 活性下降和膜透性增加,幼苗表现出盐害症状,SOD 活性下降比膜透性增加出现的早。轻度盐分胁迫随时间延长,鲁棉6号的子叶 SOD 活性有一定增加,表明棉花幼苗具有一定的耐盐能力。耐盐性不同的两个品种在 SOD 活性和细胞质膜透性变化上有差异,并对 SOD 作为棉花抗盐碱育种指标进行讨论。
The distribution of SOD activity in cotyledon of cotton seedling is the highest activity of cytosolic part. Followed by mitochondria, chloroplasts again. The SOD activity of organelles is sensitive to different salinity, followed by chloroplast> mitochondria> cytosolic fraction. In the early stage of salt stress, the cotyledons of cotton seedlings could maintain higher SOD activity, but with the increase of salt stress intensity, the SOD activity and membrane permeability of cotyledon decreased, the seedlings showed salt damage symptoms, the SOD activity decreased more than the membrane permeability Increase appearing early. Mild salt stress prolonged with time, SOD activity in cotyledons of Lushian 6 increased to a certain extent, indicating that cotton seedlings have some salt tolerance. Salt tolerance of two different varieties of SOD activity and changes in plasma membrane permeability differences, and SOD as cotton salt resistance and alkali breeding indicators are discussed.