EFFECTS OF SODIUM CARBONATE ON WATER ABSORPTION AND MEMBRANE PERMEABILITY OF PUCCINELLIA TENUIFLORA SEEDS DURING GERMINATION
Chen Yueyan Sun Guorong Li Jingxin (Department of Biology, Harbin Normal University, Harbin 150080)
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.