小麦苗在渗透胁迫下膜特性的变化及氯化钕的调控作用  

Changes in Membrane Characteristics of Wheat seedlings under Different Osmosis Stresses and the Effect of Neodymium chloride

作　　者：沈又佳[1] 陈靠山[1] 曹剑峰 刘世家[1] 周燮[1] 

机构地区：[1]南京农业大学农学系

出　　处：《江苏农业学报》1995年第1期6-10,共5页Jiangsu Journal of Agricultural Sciences

基　　金：宁夏科委资助

摘　　要：小麦苗在不同浓度的聚乙二醇中处理２４小时，叶片相对含水量（ＲＷＣ）在聚乙二醇浓度为２０％时降至８８％，以Ｋ＋渗出率与相对电导率衡量的质膜透性显著升高，过氧化物酶活性在轻微胁迫时增加，随胁迫增强又下降，膜脂肪酸配比无变化。ＮｄＣｌ３可减少胁迫下ＲＷＣ的下降，抑制Ｋ＋与电解质的渗出，但不改变膜脂肪酸的配比，并发现ＮｄＣｌ３在短时间内即有降低叶片电解质外渗的效应。After Wheat seedlings are treated with different concentrations of PEG-6000 for 24h,their relative water content(RWC)decreased to 88% when PEG concentration was 20%.While their plasma membrane permeability expressed in K+ leakage and electrical conductivity increased significantly.The peroxidase activity increased during slight stress and decreased during serious stress.The fatty acid composition in membrane lipids did not change apparently.Treating the seedlings with NdCl3 of 35μmol/L reduced decrease in RWC and leakage of K+ and electrolytes in 30 minutes,but did not affect the acid composition in membrane lipids.

关 键 词：小麦 氯化钕 膜透性 膜脂肪酸配比 渗透胁迫 

分 类 号：S512.101[农业科学—作物学]