土壤干旱胁迫对毛鸡骨草幼苗生长及某些生理特性的影响

Effect of soil drought stress on growth and some physiological properties of Abrus mollis seedlings

关键词:  毛鸡骨草  幼苗  干旱胁迫  生物特性  生理指标

Key words:  Abrus mollis  seedling stage  drought stress  biological character  physiological indexes

摘要:

以毛鸡骨草幼苗为试验材料，测定毛鸡骨草在不同水分条件下的生长状况和相关的生理生化指标，结果表明：随着干旱胁迫的增加，毛鸡骨草幼苗的株高、茎粗、复叶长等呈递减趋势，根直径、须根数呈递增趋势；根、叶片脯氨酸含量和叶片可溶性糖的含量均呈先降低再上升的趋势，水势随干旱胁迫的加剧呈先上升后降低的趋势，根系活力随干旱胁迫的加剧呈递减趋势。但是，在严重干旱胁迫下，各生长指标的增长均受到明显的抑制。

Abstract:

Experiments were implemented on physiological and biochemical properties of Abrus mollis seedlings under four different water stress treatments. The results indicated that with the increasing of drought stress，the plant height，stem diameter，compound leaf length of A.mollis showed tendency of decreasing，while root diameter，fibrous root number of A.mollis were presented with progressive tendency during in seedling stages；the free proline content in root and leaf as well as soluble sucrose content were decreased first and then increased，when the soil water decreased gradually；minase of A.mollis showed the tendency of increase first and then decrease，on the contrast，the root activity showed the tendency of decreasing with the aggravation of drought stress，but under severe drought stress，the growth of above indicators were inhibited.