Na2CO3胁迫对星星草种子萌发过程中水分吸收及膜透性的影响

星星草种子萌发吸水过程可以分为３个阶段。吸水量随着Ｎａ２ＣＯ３浓度增高而逐渐降低。但不同阶段吸水量随着盐浓度的上升而下降的幅度不同，第１阶段降低幅度较小，第３阶段则较大。盐浓度大小于２．７５％时，星星草种萌发，吸水停滞于第２阶段。星星草种子吸涨初始时，膜透性较大，随着吸涨的进行，膜逐渐得以修复，Ｎａ２ＣＯ３胁迫的下，膜系统修复受阻，ＮａＣＯ３浓度与膜透性正相关极其显著。发芽率和膜透性之间极其显著的

EFFECTS OF SODIUM CARBONATE ON WATER ABSORPTION AND MEMBRANE PERMEABILITY OF PUCCINELLIA TENUIFLORA SEEDS DURING GERMINATION

Water absorption process of Puccinellia tenuiflora seeds during germination can be divided into three phases. The amount of water absorbed decreased gradually along with the concentration increasing of Na 2CO 3 solution, but the amount decreased in different phases is different, less in the first phase and more in the third one. The seeds could not germinate when the salt concentration was more than 2.75%, water absorbing stopped at stage 2. At the beginning of imbibition, the membrane permeability was higher, and decreased gradually because of the membrane restoration along with imbibition. The membrane restoration is inhibited by Na 2CO 3 stress. The membrane permeability has the significant positive correlation to Na 2CO 3 concentration. The significant negative correlation between germination percentage and membrane permeability indicates that inhibition of membrane restoration is a important reason that inhibits germination under salt stress.