干旱胁迫对绢毛委陵菜叶片解剖结构和生理指标的影响

Effects of drought stress on anatomical structures and physiological indexes of Potentilla sericea leaves

以绢毛委陵菜(Potentilla sericea)为材料,采用盆栽控水试验研究土壤干旱胁迫下叶片解剖结构和生理指标的变化。结果表明,随着干旱胁迫程度的增加叶片厚度、上下表皮厚度、栅栏组织和海绵组织的厚度均逐渐减小,且栅栏组织同海绵组织的厚度比大于未受干旱胁迫的植株。随着干旱胁迫时间的延长,叶绿素含量呈逐渐下降的趋势,丙二醛、脯氨酸的含量和超氧化物歧化酶的活性均呈先上升后下降的变化趋势。本研究表明,在干旱胁迫下绢毛委陵菜通过改变叶片生理功能和内部解剖构造来适应干旱环境。

In this paper, Potentilla sericea leaves were chosen as testing materials to research their anatomical structures and physiological indexes under drought stress, through controlling the moisture of soil in pots. The results showed that thicknesses of leaves, upper and lower epidermis, palisade tissue and spong- y parenchyma gradually decreased with the increasing of drought stress gradient, while the ratio of palisade tissue to spongy parenchyma was higher than that of non-water stress leaves. As the water stress pro- longed, the content of chlorophyll was gradually decreased; contents of MDA and proline, and the activity of superoxide dismutase all first increased and then decreased. These results indicated that P. sericea under drought stress could be to adapt to arid environments by changingthe physiological functions and anatomical structures of leaves.