干旱胁迫对不同小叶杨无性系生理特性的影响

Effects of drought stress on physiological characteristics of different Populus simonii clones

为了解不同小叶杨无性系在干旱胁迫下的抗旱性,为青海省的造林建设选出最适宜栽植的小叶杨无性系,本试验以5个不同小叶杨无性系为研究对象,通过控制浇水对小叶杨进行干旱胁迫,根据测定5个小叶杨无性系在干旱胁迫下的土壤含水量以及不同土壤含水量阶段下的叶绿素含量,超氧化物歧化酶(SOD)和游离脯氨酸(Pro)3个指标的变化,最终筛选出抗旱性最强的小叶杨无性系。结果表明:随着干旱胁迫的加剧,土壤含水量逐渐下降,而叶绿素含量、超氧化物歧化酶含量均表现为先升高后降低的趋势,游离脯氨酸含量则逐渐增加。因此,通过数据分析可以得出5个不同小叶杨无性系的抗旱性强弱为:青海海西地区小叶杨无性系>中国林科院杂交引进种小叶杨>青海祁连县小叶杨无性系>青海门源小叶杨无性系>辽宁小叶杨无性系。

In order to understand the drought resistance of different Populus simonii clones under drought stress,and screen the most suitable clones of Populus simonii for afforestation in Qinghai province,five different clones of Populus simonii were used as the research objects and drought stress was conducted by controlling watering. The soil water content,and chlorophyll superoxide dismutase (SOD) and proline (Pro) content of different Populus simonii clones under different soil water regimes were measured. The most drought-resistant Populus simonii clone was selected based on the three indicators. The results showed that with the increase of drought stress,soil water content decreased gradually,while chlorophyll and superoxide dismutase content increased first and then decreased,and proline content increased gradually. Through the analysis of the data of five different Populus simonii clones,the drought resistance was in order of Qinghai Haixi Populus simonii >introduced Populus simonii hybrid from Chinese Academy of Forestry>Qinghai Qilian Populus simonii >Qinghai Menyuan Populus simonii >Liaoning Populus simonii .