CaCl_2和Ca（NO_3）_2对降低玉米幼苗质膜透性的作用

EFFECTS OF CaCl2 AND Ca(NO3)2 ON THE PERMEABILITY OF PLASMA MEMBRANE IN CORN SEEDLING

以玉米（鲁玉１１号）为实验材料．分别用１５０ｍｍｏｌ／ＬＮａＣｌ，１５０ｍｍｏｌ／ＬＮａＣｌ＋１５ｍｍｏｌ／ＬＣａＣｌ２及１５０ｍｍｏｌ／ＬＮａＣｌ＋１５ｍｍｏｌ／ＬＣａ（ＮＯ３）２的１／２浓度Ｈｏａｇｌａｎｄ溶液连续处理５天后，分别测定ＭＤＡ含量、质膜透性、植物鲜重、植物干重及植物体内Ｎａ＋含量．实验结果表明，ＮａＣｌ严重地抑制玉米的生长，而ＣａＣｌ２和Ｃａ（ＢＯ３）２均能降低由ＮａＣｌ引起的抑制效应，且Ｃａ（ＮＯ３）２优于ＣａＣｌ２此外，ＮａＣｌ增加细胞质膜透性、植物体内Ｎａ＋和ＭＤＡ含量ＣａＣｌ２和Ｃａ（ＮＯ３）２降低质膜遍性，减少植物体内Ｎａ十和ＭＤＡ含量，Ｃａ（ＮＯ３）２的这种效应好于ＣａＣｌ２．

Corn (Zea mays'L.Luyu 11)has been traied by 150 mmol/L NaCl, 150 mmol/LNaCl+15 mmol/L CaCl2, 150mmol/L NaCl+15mmol/L Ca(NO3)2in 1/2 Hongland solution for 5 days respectivelys MDA, permeability of plasma membrane,dry weight, fresh weight and concentration of Na+ in plants were determined after treatments. Results show that NaCl seriously inhibits the growth of corn,CaCl2 and Ca(NO3)2 have lowered the inhibition effects induced by NaCl.Besides,NaCl has increased plasmalemma permeability and the content of Na+ as well as MDA in plants. CaCl2 and Ca(NO3)2 have lowered plasmalemma permeability,while the content of Na+ and MDA has decreased, and the effect of Ca(NO)2,is bettr than that of CaCl2.