白茎盐生草幼苗对干旱胁迫的响应研究

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、...

Response of Halogeton arachnoideus seedling to drought stress

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.