摘要
为探究落羽杉(Taxodium distichum)幼苗在干旱胁迫下的生理机制,为落羽杉耐旱性的理论研究及消落带植被选择提供参考,以2年生落羽杉幼苗为研究对象,采用不同浓度聚乙二醇(PEG-6000)与霍格兰(Hoagland)混合液模拟干旱胁迫,设置6个PEG-6000浓度梯度(0、5%、10%、15%、20%和25%),研究不同干旱胁迫程度下落羽杉幼苗生理特性。结果表明,随干旱胁迫程度增加,叶绿素a、叶绿素b和总叶绿素含量均呈先降后升的趋势。可溶性糖、可溶性蛋白和丙二醛(MDA)含量及超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均随干旱胁迫程度增加而升高,抗坏血酸过氧化物酶(APX)活性呈先升后降的趋势。落羽杉幼苗对干旱胁迫有较好的调节能力和较强的耐受性,是适用于消落带景观改良和绿化的重要树种。
In order to explore physiological mechanism of Taxodium distichum seedlings under drought stress and provide a reference for drought tolerance study of T.distichum and selection of vegetation in fluctuating zone.A simulated drought stress experiment was conducted on two-year-old T.distichum seedlings by mixed solutions of PEG-6000 and Hoagland with different concentrations.Six PEG-6000 concentrations(0,5%,10%,15%,20%and 25%)were set to study physiological characteristics of T.distichum seedlings under differ‐ent drought stress.Results showed that with increase of drought stress,contents of chlorophyll a,chlorophyll b and total chlorophyll decreased firstly and then increased.Contents of soluble sugar,soluble protein and MDA,as well as SOD and POD activities increased with increase of drought degree,while APX activity increased first‐ly and then decreased.T.distichum seedlings had good ability to adjust to drought stress,which is important tree species that is suitable for landscape improvement and greening in fluctuating zone.
作者
梁炜文
周红英
杨景竣
覃奎
刘秀
Liang Weiwen;Zhou Hongying;Yang Jingjun;Qin Kui;Liu Xiu(Guangxi State-owned Gaofeng Forest Farm,Nanning,Guangxi 530001,China;Guangxi Forestry Research Institute,Nanning,Guangxi 530002,China;Guangxi University,Nanning,Guangxi 530004,China)
出处
《广西林业科学》
2022年第4期489-493,共5页
Guangxi Forestry Science
基金
广西壮族自治区财政林木良种繁育补助项目(湿地木本植物种质资源收集、筛选与评价)。
关键词
生理特性
干旱胁迫
落羽杉
幼苗
physiological characteristic
drought stress
Taxodium distichum
seedling
