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利用杂交棉Ｈ２８一代杂交种及其母本９１２８８，研究了ＰＥＧ和ＮａＣｌ胁迫下两个品种的生理反应。ＰＥＧ胁迫下，两品种的生长发育和气孔扩散阻力基本一致，但Ｈ２８的ＰＯＤ活性逐渐上升，９１２８８的ＰＯＤ活性则保持较低水平；ＮａＣｌ胁迫下，Ｈ２８在生长发育和气孔阻力变化上表现出较高的耐受能力，其ＰＯＤ活性显著上升，但两品种Ｎａ＋积累量和Ｎａ＋／Ｋ＋未见明显差异。这些结果表明，棉花拒盐能力较弱，不同品种耐盐性的差别与盐离子积累量关系不大，而与ＰＯＤ活性升高密切相关；而棉花对ＰＥＧ胁迫的忍耐性与ＰＯＤ活性的相关关系不明显。
Physiological responses of two cultivars under PEG and NaCl stress were studied using hybrid H28 hybrids and their female parent 91288. Under PEG stress, the growth and development of two cultivars were basically consistent with that of stomatal diffusion, but the activity of POD in H28 increased gradually and the activity of POD in 91288 remained low. Under NaCl stress, H28 showed more changes in growth and stomatal resistance High tolerance ability, POD activity increased significantly, but the two varieties of Na + accumulation and Na + / K + no significant difference. These results showed that the ability of cotton to resist salt was weak and the difference of salt tolerance of different cultivars was not related to the accumulation of salt ions but closely related to the increase of POD activity. The correlation between the tolerance of cotton to PEG stress and POD activity Not obvious.