白茎盐生草幼苗对干旱胁迫的响应研究  

Response of Halogeton arachnoideus seedling to drought stress

作　　者：赵广兴 徐天渊 李王成[1,2,3] 高海燕 赵相宇 ZHAO Guangxing;XU Tianyuan;LI Wangcheng;GAO Haiyan;ZHAO Xiangyu(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021;Engineering TechnologyResearch Center of Water-Savingand WaterResourceRegulation in Ningxia,Yinchuan 750021;EngineeringResearch Center for Efficient Utilization of Modern Agricultural WaterResources in AridRegions,Ministry of Education,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,银川750021 [3]旱区现代农业水资源高效利用教育部工程研究中心,银川750021

出　　处：《干旱区资源与环境》2021年第4期195-202,共8页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(51869023);宁夏高等学校一流学科建设(水利工程学科)项目(NXYLXK2017A03);宁夏自治区级青年拔尖人才项目(030103030008)资助。

摘　　要：采用盆栽试验对白茎盐生草幼苗进行为期0d、5d、10d、15d、20d、25d的自然失水胁迫,通过生理生长指标和叶片微观结构研究白茎盐生草幼苗对干旱胁迫的响应,为干旱半干旱区水土保持和生态恢复提供理论基础。研究表明:随干旱程度的加深,土壤含水率、白茎盐生草叶片肉质化程度、叶片相对含水量明显下降,而根冠比、质膜相对透性、株高、冠幅呈现不同程度的上升趋势。对白茎盐生草叶片进行扫描电镜观察发现:随着干旱天数的增加,气孔长度、气孔宽度、气孔开度减小、保卫细胞增厚、而气孔密度变化不明显。结论:白茎盐生草幼苗通过增大根冠比和质膜相对透性,减小叶片肉质化程度、叶片相对含水量,株高和冠幅的增长量也减小,减小气孔长度、气孔宽度、气孔开度来适应干旱胁迫。The pot experiment was conducted to investigate the natural water loss stress on Halogeton arachnoideus seedlings for 0 d,5 d,10 d,15 d,20 d and 25 d,and drought stress was studied through physiological growth indexes and leaf microstructure,so as to provide a theoretical basis for soil and water conservation and ecological restoration in arid and semi-arid regions.The results showed that soil moisture content,succulency degree and relative water content of Halogeton arachnoideus leaf significantly decreased,while the root-cap ratio,relative permeability of plasma membrane,plant height and crown width increased in different degrees with the increase of drought stress.Scanning electron microscope observation showed that stomatal length,stomatal width,stomatal opening decreased,guard cells thickened,but stomatal density did not change obviously with the increase of drought days.Conclusion:By increasing the root-cap ratio and the relative permeability of the plasma membrane,the leaf succulency degree,leaf relative water content,plant height and crown width were reduced,and stomatal length,stomatal width and stomatal opening were reduced to adapt to drought stress.

关 键 词：白茎盐生草 叶片微观结构 自然失水胁迫 

分 类 号：Q945.78[生物学—植物学]