北京园林绿化耐热白桦种源筛选  

Identifying Heat Endurance Provenances of Betula platyphylla for Landscape Architecture of Beijing

作　　者：李子敬[1] 王永格[1] 卜燕华[1] 邢越[1] 丛日晨[1] 

机构地区：[1]北京市园林科学研究所,绿化植物育种北京市重点实验室,北京100102

出　　处：《科学技术与工程》2013年第16期4635-4638,4646,共5页Science Technology and Engineering

基　　金：北京市公园管理中心课题资助

摘　　要：为筛选适应北京地区气候的耐热白桦种源,丰富北京园林绿化植物种类,对收集的7个不同白桦种源进行高温胁迫处理,比较了胁迫后不同种源间的叶片相对水分含量、丙二醛含量、叶绿素含量、细胞膜透性和光合速率等指标的差异,并采用聚类分析的方法划分了几种白桦的耐热型。结果表明不同种源的相对电导率、光合速率和形态受害等级差异显著,种源"园科"在细胞膜透性和光合速率等方面表现出较小的胁迫伤害。结论认为相对电导率、光合速率和形态受害指标是白桦耐热性评价的重要指标,种源"园科"是适合于北京地区的最具栽培潜力的耐热白桦种源。The high temperature resistance of seven Betula platyphylla provenances ＇were compared by physio- biochemical indexes such as leaf relative water content, chlorophyll content, relative conductivity, photosynthetic rate, malondialdehyde and harmed grade after high temperature stress,in order to cultivate high- temperature-resist- ant-breed of B. platyphyUa and enrich plant species in Beijing landscape architecture. The heat endurance types of B. platyphylIa were divided by cluster analysis. The results showed that relative conductivity, photosynthetic rate and Harmed Grade among 7 provenances are significant. Provenances ＇ YK＇ were showed low relative conductivity and higher photosynthetic rate. The conclusion are 1 ） relative conductivity, photosynthetic rate and Harmed Grade are Key indexes of heat endurance ability of B. platyphylla, 2） provenances ＇ YK＇ is the most potential heat-resist- ance provenances for Beijing.

关 键 词：白桦 高温胁迫 生理生化指标 形态 

分 类 号：S722.5[农业科学—林木遗传育种]