Effect of salt stress on activity of superoxide dismutase （SOD） in Ulmus pumila L.

房间质膜的损害忍耐和在 Ulmus pumila 叶子的血浆膜保护系统的关联词酶活动由九集中对待(0.3%，0.6%，0.9%，1.2%，1.5%，1.8%，2.1%，2.4%，3.0%)在东北林地大学的一个温室 Na_2CO_3 和 NaHCO_3mixtures 被学习，哈尔滨，中国。电解质漏(REL ) 和草皮(Superoxide dismutase ) 的率在不同样品的叶子的活动被决定。结果证明在 U 的叶子的 REL。pumila 在盐集中介绍了一个慢慢地增加的趋势不到 1.5% ，它显示 U.pumila 的那房间质膜让相当强壮的抵抗有，并且在盐集中有重要增加到盐离子的损害超过 1.5% 。在 U 的叶子的草皮活动。pumila 在盐集中介绍了一个增加的趋势不到 1.5% ，幼苗的生长当盐集中超过了 1.5% 时，衰落，和发辫和叶子没有损害的症状， SODactivities 严厉地即时减少了， REL 增加了。

The injury tolerance of cell plasma membrane and the correlative enzymes activities of plasma-membrane protection system in the Ulmuspumila leaves treated by nine concentrations （0.3%, 0.6%, 0,9%, 1,2%, 1.5%, 1.8%, 2,1%, 2.4%, 3.0%） of Na2CO3 and NaHCO3 mixtures were studied in a greenhouse of Northeast Forestry University, Harbin, China. The rate of electrolyte leakage （REL） and SOD （Superoxide dismutase） activity in leaves of different samples were determined. Results showed that the REL in leaves of U. pumila presented a slowly increasing trend at the salt concentrations less than 1.5%, which indicated that cell plasma membrane of U. pumila leaves had rather strong resistance to the injury of salt ion, and had a significant increase at the salt concentrations more than 1.5%. The SOD activities in leaves of U, pumila presented an increased trend at salt concentrations less than 1.5%, the growth of seedlings did not decline, and tress and leaves had no symptom of injury, while the salt concentrations exceeded 1.5%, SOD activities sharply decreased and REL increased promptly.