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高寒山区牧草根质膜和脂肪酸组分对冷冻低温的适应反应
引用本文:周瑞莲,赵哈林.高寒山区牧草根质膜和脂肪酸组分对冷冻低温的适应反应[J].植物生态学报,2001,25(1):115-118.
作者姓名:周瑞莲  赵哈林
作者单位:1. 兰州大学
2. 中国科学院寒区旱区环境与工程研究所,
基金项目:国家自然科学基金(347940)和国家九七三(G1999043404)项目
摘    要: 在秋末冬初测定了高寒山区自然生境中生长的垂穗披碱草(Elymus nutans)、早熟禾(Poa sphyondylodes) 和花雀麦(Bromus sinensis)3种牧草根膜脂脂肪酸组分和质膜流动性及ATPase活力。结果表明:随着秋末冬初气温下降到0℃以下,3种牧草根中膜脂肪酸配比发生较大变化,棕榈酸相对百分含量下降40.29%,亚油酸增加3倍多,亚麻酸增加112.39%,脂肪酸不饱和指数(IUFA)增大;同时根质膜流动性在低温期间较大,在融冻阶段有下降,冰冻阶段增大;质膜Mn2+ATPase、Ca2+ ATPase活力增大,Mg2+ ATPase活力下降。在冷冻适应中牧草根膜脂脂肪酸不饱和度的增加直接影响着膜的流动性,影响膜功能和植物抗冻性,并在维持根细胞膜完整性和抵抗组织结冰伤害方面起重要作用。

关 键 词:脂肪酸组分  多年生牧草  冷冻适应  质膜特
修稿时间:1999年6月23日

FALL AND EARLY WINTER CHANGES IN ROOT FATTY ACID COMPOSITION AND MEMBRANE FLUIDITY OF THREE PERENNIAL ALPINE GRASSES
ZHOU Rui-Lian,ZHAO Ha-lin.FALL AND EARLY WINTER CHANGES IN ROOT FATTY ACID COMPOSITION AND MEMBRANE FLUIDITY OF THREE PERENNIAL ALPINE GRASSES[J].Acta Phytoecologica Sinica,2001,25(1):115-118.
Authors:ZHOU Rui-Lian  ZHAO Ha-lin
Abstract:Changes in fatty acid composition of roots of Elymus nutans, Poa sphyondylodes, and Bromus sinensis growing in alpine area were investigated over late fall and early winter. The results indicated that there were marked changes in the fatty acid composition in this period. The content of saturated palmitic acid (16:0) decreased by 40%, while the content of unsaturated linolenic acid (18:3) increased by 112%, resulting in an increase in IUFA (index of unsaturated fatty acid) melting level. Membrane fluidities were low at the freezing-melting stage, but higher in the freezing stage. Ca 2 , Mn 2 ATPase activities of plasma membranes increased, but Mg 2 ATPase activities decreased. The results suggested that increase in unsaturated fatty acid content of roots may be a very important physiological response to cold acclimation, which is directly associated with changes in the properties of plasma membranes, in maintaining membrane fluidity and controlling the activities of membrane integrated enzymes.
Keywords:Fatty acid composition  Perennial  grasses  Cold acclimation  Membrane fluidity
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