NaCl、Na_2SO_4对盐芥生长和生理胁迫效应的比较

COMPARATIVE STUDIES ON GROWTH AND PHYSIOLOGICAL REACTION OF THELLUNGIELLA SALSUGINEA UNDER NaCl AND Na_2SO_4 STRESSES

分别用含有0、100、150、200mmol/L NaCl和Na2SO4的Hoagland培养液处理盐芥幼苗,处理一定时间后测定其鲜重、干重、离子含量、质膜透性、Na+/K+比值、光合速率等的变化.结果表明:两种盐处理都能抑制盐芥的生长,并且Na2SO4处理比相同浓度的NaCl处理抑制更明显;盐芥肉质化程度降低;盐芥地上部及根部Na+含量远远高于对照,并且盐主要积累在地上部.这些结果说明盐芥不是稀盐盐生植物,也不是拒盐植物,推测其耐盐机制可能建立在基础生理生化的代谢上.

Seedlings of Thellungiella salsuginea growing in Hoagland nutrient solutions were treated with different concentrations of NaCI （0, 100, 150, 200 mmol/L） and Na2SO4（100, 150, 200 mmol/L）. Fresh weight, dry weight, ion contents, photosynthetic rate, c （Na）/c （ K ） and cytomembrane permeability were measured. The results showed that the growth of T. salsuginea was inhibited by salinity and the extent of inhibition under Na2SO4 stresses was greater than NaCI stresses. The degree of succulence decreased treated with salinity. The Na^＋ content of the shoots and the roots under salinity was great higher than the control and Na^＋ was mainly transported to shoots. These result showed that T. salsuginea was not salt - dilution halophyte or a pseudo - halophyte. The author hypothesized its salt - tolerence mechanism may be mainly related to the metabolism of the basic physiology and biochemistry .