零下低温对杂交杨树皮层膜脂组成的影响  

Effects of below zero cold on the compositions of membrane lipids in the ou ter bark of hybrid poplars

作　　者：包宏[1] 关世英[1] 胡兹苓[1] 蒋敬 郭会玲 

机构地区：[1]南京林业大学,南京林业学校,中国林业科学研究院

出　　处：《植物资源与环境》1994年第4期39-43,共5页Journal of Plant Resources and Environment

基　　金：国家自然科学基金

摘　　要：以不耐寒的美洲黑杨（Ｐｏｐｕｌｕｓｄｅｌｔｏｉｄｅｓｃｖ．“Ｌｕｘ”Ｉ－６９／５５，父本）和耐寒性较强的欧美杨（Ｐ．ｅｕｒａｍｅｒｉｃａｎａｃｌｃｖ．Ｉ－４５／５１，母本）的４个杂交Ｆ＿１代无性系（９５杨、５５９杨、６００杨和１３８１杨）为材料，分析了零下低温寒潮前后枝条皮层的脂质组成。结果表明，寒潮影响下，皮层中磷脂含量增加而组成基本不变，膜脂脂肪酸组成的变化规律是：寒潮前脂肪酸不饱和指数（ＩＵＦＡ）值大的无性系，寒潮前后的ＩＵＦＡ值变化量小；寒潮前ＩＵＦＡ值较小的无性系，寒潮前后ＩＵＦＡ值变化量较大。本文借用力学概念，提出相对抗性概念，给出杨树无性系的相对抗性序列。序列表明Ｆ＿１代无性系的耐寒性已较不耐寒的父本提高，这与田间观察基本一致。he compositions of membrane lipids in outer bark of hybrid poplars collected before and after a below zero cold wave were determined. Samples were four F_1clones between Populus euramericanacl cv. I- 45/51 , as female P_1 with higer chilling-tolerance,and P. deltoides cv.“Lux”I-69/55 as male P_1, with lower chilling-tolerance. The results showed that the total amounts of phospholipids after cold wave increased whil the relative contents of phospholipids have did not marked variations.The changes of fatty acid compositions showed that F_1 colones with lower vaiue of Index of Unsaturated Fatty Acid(IUFA) before cold wave have apparent variations in IUFA after cold wave while others with higher IUFA before cold wave have less variations.This paper presents the relative resistance concept and the relative resistance order is inferred. It shows that the four F_1 sampled have got higher chilling-tolercence than their male P-1.This is approximately identical with the results of fjeld observation.

关 键 词：杨树 膜脂 杂交杨树 抗冻性 

分 类 号：S792.110.1[农业科学—林木遗传育种]