干旱胁迫下4种委陵菜属植物叶片的超微结构

Leaf ultrastructures of four Potentilla species under drought stress

以4种野生委陵菜属(Potentilla)植物作为研究对象,通过透视电镜观察干旱胁迫条件下其叶片超微结构的变化。结果表明,随着干旱胁迫的加强,叶绿体和线粒体的受损程度逐渐增大,嗜锇颗粒的数量也逐渐增加,叶绿体逐渐减小且数量略有增加。通过对比同一干旱胁迫条件下4种植物叶绿体和线粒体的受损程度,判断其耐旱能力强弱为轮叶委陵菜(P.verticillaris)>白叶委陵菜(P.leucophylla)>翻白委陵菜(P.discolor)>委陵菜(P.chinensis)。因此,干旱胁迫下叶绿体、线粒体结构的破坏程度可以作为评价委陵菜属植物耐旱性强弱的形态结构指标之一。

In this study, leaf ultrastructures of Potentilla chinensis, P. discolor, P. leucophylla and P. verticillaris under drought stress were investigated by transmission electron microscopy. The results showed that with the drought stress strengthening, the damage of chloroplast and mitochondria gradually increased, the number and the volume of osmiophilic also gradually increased, and the chloroplast, s area gradually decreases and slightly increase in the number. Through the comparison of chloroplast and mito- chondrial damage of four kinds of plants in same drought stress gradient, it was found that the ability of drought stress was in the following order： P. verticillaris〉 P. leucophylla〉 P. discolor〉 P. chinensis. Therefore, the degrees of plant chloroplasts and mitochondria structural damage are related to drought tol- erance, which can be used to evaluate the strength of drought resistance of morphological traits of genus Potentilla.