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２００ｍｍｏｌ／ＬＮａＣｌ处理，可以迅速改变叶片的气孔阻力，气孔阻力的变化速度品种间存在差异。１００ｍｍｏｌ／Ｌ的ＮａＣｌ胁迫，Ｈ２８的ＰＯＤ活性逐渐升高，其它３个品种的ＰＯＤ活性则是先降低后升高；２００ｍｍｏｌ／Ｌ的ＮａＣｌ胁迫，鲁棉１１的ＰＯＤ活性一直保持较低水平，其它３个品种也是先降低后升高，尤以Ｈ２８升高最为明显。棉株地上部Ｎａ＋积累量和Ｎａ＋／Ｋ＋随外界ＮａＣｌ浓度增加而升高，品种间未见明显差异。这些结果表明，棉花拒盐能力较弱，品种间耐盐性差异与离子积累量关系不大，而与叶片内有关酶的活性变化密切相关。文中对ＮａＣｌ胁迫信息在根冠间的传递进行了讨论
200mmol / LNaCl treatment, can quickly change the leaf stomatal resistance, stomatal resistance changes in the rate of variation between varieties. Under 100mmol / L NaCl stress, the POD activity of H28 increased gradually while that of the other three cultivars decreased firstly and then increased. Under 200mmol / L NaCl stress, the activity of POD in Lumi11 was kept at a low level. Three varieties are also reduced after the first increase, especially in H28 increased the most obvious. The accumulation of Na + and Na + / K + in shoots of cotton plant increased with the increase of NaCl concentration, but there was no significant difference among varieties. These results indicate that the ability of the cotton to resist salt is weak, and the difference of salt tolerance among cultivars is not related to the accumulation of ions, but closely related to the activity change of the related enzymes in the leaves. In this paper, the transmission of NaCl stress information between roots and canals is discussed