干旱胁迫对脱皮榆幼苗生长及生理生化特性的影响  

Effect of Drought Stress on the Growth,Physiological and Biochemical Characteristies of Ulmus lamellosa seedlings

作　　者：刘洋 LIU Yang(Baotou Vocational&Technical College,Inner Mongolia,Baotou 014035,China)

机构地区：[1]包头职业技术学院,内蒙古包头014035

出　　处：《内蒙古林业科技》2024年第4期1-5,共5页Journal of Inner Mongolia Forestry Science and Technology

基　　金：内蒙古自治区自然科学基金(2023QN03037)。

摘　　要：以1 a生脱皮榆(Ulmus lamellosa)幼苗为研究对象,采用盆栽控水方法,设置土壤含水量分别为田间持水量的80%(对照)、60%(轻度干旱胁迫)、40%(中度干旱胁迫)和20%(重度干旱胁迫)4个处理水平梯度,研究干旱胁迫对脱皮榆幼苗生长和生理生化特性的影响。结果显示:随着干旱胁迫强度的增加,脱皮榆幼苗的株高和地下生物量呈逐渐下降的趋势,地上生物量、总生物量、过氧化氢酶(CAT)活性和脯氨酸(Pro)含量呈先上升后下降的趋势,超氧化物歧化酶(SOD)活性和过氧化物酶(POD)活性呈先下降后上升再下降的趋势,可溶性蛋白和丙二醛(MDA)含量呈先下降后上升的趋势。轻度干旱胁迫下幼苗的地上生物量和总生物量最大。脱皮榆幼苗的生长指标之间及生长与生理指标呈现一定的相关性。研究表明,在不同的干旱胁迫条件下,脱皮榆幼苗的生长受到一定程度的抑制,但能够通过调节自身生理代谢来抵御干旱胁迫,轻度干旱胁迫是脱皮榆幼苗生长的适宜土壤水分条件。Using one-year-old Ulmus lamellosa seedlings as the research object,a pot cultivation method was used to control water content,and four treatment levels of soil moisture content were set at 80%(control),60%(mild drought stress),40%(moderate drought stress),and 20%(severe drought stress)of the field capacity,to study the effects of drought stress on the growth and physiological and biochemical characteristics of Ulmus lamellosa seedlings.The results showed that with the increase in drought stress intensity,the plant height and underground biomass of the seedlings gradually decreased,while the aboveground biomass,total biomass,catalase(CAT)activity,and proline(Pro)content showed a trend of first increasing and then decreasing.Superoxide dismutase(SOD)and peroxidase(POD)first decreased and then increased,and then decreased again.The soluble protein content and malondialdehyde(MDA)content showed a trend of first decreasing and then increasing.Under mild drought stress,the aboveground biomass and total biomass of seedlings were the highest.There was a certain correlation between the growth indicators and between growth and physiological indicators of seedlings.The study showed that under different drought stress conditions,the growth of Ulmus lamellosa seedlings was inhibited to a certain extent,but they could resist drought stress by regulating their own physiological metabolism,and mild drought stress was a suitable soil moisture condition for the growth of Ulmus lamellosa seedlings.

关 键 词：脱皮榆 幼苗 干旱胁迫 生长指标 生理指标 

分 类 号：S792.19[农业科学—林木遗传育种]