黄柳叶片对水分亏缺的生理响应

Physiological Response of Salix gordejevii Leaves Under the Conditions of Water Deficiency

在实验室通过离体叶片来模拟水分亏缺,对黄柳的各项生理指标进行了测定,以分析研究其叶片对水分亏缺的生理响应,结果表明:在水分亏缺条件下,黄柳叶片含水量和相对含水量较多,持水能力较强;随着水分亏缺程度的增加,黄柳叶片的Pro含量增加,对黄柳均有渗透调节作用;黄柳SOD活性和POD活性增加,且与CAT进行了较好的协调作用,以减缓自由基对细胞膜系统的伤害;黄柳叶片中MDA含量逐渐增加,说明膜系统的伤害程度也随水分亏缺程度的增加而加剧。因此,在生理特性上,黄柳亦表现出了对沙地干旱环境的适应特性。

Under the conditions capacity of Salix gordejevii of water deficiency, relative water content, bound water content and water - holding were high. With the increase of the water deficiency degree, soluble sugar content and Pro content of leaves increased, and had the effect of osmoregulation to Salix gordejevii; The SOD activity and POD activity raised, and assorted with CAT in order to mitigate hurt of O2^-. The content of MDA raised gradually. It was showed that hurtful degree of membrane protective system increased with the increase of water deficiency degree. Therefore, as viewed from physiological characteristics, Salix gordejevii exhibited adaptive character- istics of drought too.