首页 | 本学科首页   官方微博 | 高级检索  
     检索      

PEG模拟干旱胁迫对玉竹生理特性的影响
引用本文:岳桦,孙珊珊,李玉珠.PEG模拟干旱胁迫对玉竹生理特性的影响[J].东北林业大学学报,2012,40(5):43-45,121.
作者姓名:岳桦  孙珊珊  李玉珠
作者单位:东北林业大学,哈尔滨,150040
摘    要:利用聚乙二醇6000(PEG6000)高渗溶液模拟干旱胁迫,研究了不同质量分数(10%、20%、30%)处理对玉竹(Polygonatum odoratum)5个生理指标的影响,评价其抗旱能力。结果表明:质量分数为20%、30%的PEG分别胁迫42、35 h,玉竹观赏价值逐渐丧失。随着PEG质量分数的增加和胁迫时间的延长:叶片相对含水量持续下降,复水后各处理均有5%~10%幅度的上升;电导率与胁迫程度呈极显著正相关,复水后质量分数为30%的PEG处理的电导率不能恢复;胁迫14 h后玉竹叶绿素b质量分数下降,同时叶绿素a质量分数上升;PEG质量分数为10%、20%处理的超氧化物歧化酶(SOD)活性在胁迫21 h后显著上升,35 h达到峰值,说明玉竹保护酶系统有清除活性氧自由基以抵御干旱胁迫的能力。研究表明:玉竹通过自身调节能够适应质量分数为20%和30%的PEG胁迫28~35 h,有较强的抗旱能力。

关 键 词:玉竹  PEG  干旱胁迫  生理特性

Effects of Drought Stress Simulated by PEG 6000 on Physiological Characteristics of Polygonatum odoratum
Yue Hua , Sun Shanshan , Li Yuzhu.Effects of Drought Stress Simulated by PEG 6000 on Physiological Characteristics of Polygonatum odoratum[J].Journal of Northeast Forestry University,2012,40(5):43-45,121.
Authors:Yue Hua  Sun Shanshan  Li Yuzhu
Institution:(School of Landscape Architecture,Northeast Forestry University,Harbin 150040,P.R.China)
Abstract:An experiment was conducted to study the effects of drought stress on five physiological characteristics of Polygonatum odoratum treated with different mass concentrations(10%,20%,and 30%) of Polyethylene glycol 6000(PEG6000) hypertonic solution in order to evaluate its drought resistance.Results showed that the ornamental value of P.odoratum disappeared gradually after 42 and 35 hours of stress by 20% and 30% PEG,respectively.With PEG concentration increasing and stress time prolonging,the leaf relative water content continued to decline,and then increased by 5%-10% after rewatering.There was a highly significant positive correlation between the electrical conductivity and the level of stress,and the electrical conductivity of P.odoratum stressed by 30% PEG could not resume after rewatering.Chlorophyll a content increased and chlorophyll b content declined after 14 hours of stress.Superoxide dismutase(SOD) activity increased significantly after 21 hours of stress by 10% and 20% PEG,with a peak value at 35 h after stress.It shows that the protective enzyme system of P.odoratum can resist drought stress by scavenging reactive oxygen free radicals.P.odoratum has a strong ability to resist drought stress,and it is able to adapt to 28-35 hours of stress by 20% and 30% PEG through self-regulation.
Keywords:Polygonatum odoratum  PEG  Drought stress  Physiological characteristics
本文献已被 CNKI 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号