皂角苗木对干旱胁迫的生理生化反应

对皂角Gleditsia sinensis的一年生实生苗进行盆栽控水干旱处理，并测定皂角的各个生理生化指标．结果表明：随着干旱胁迫的增强，超氧化物歧化酶（SOD）活性呈现先降后升；过氧化氢酶（CAT）活性、过氧化物酶（POD）活性、脯氨酸含量、可溶性糖含量及丙二醛（MDA）含量均表现为先升后降的趋势；苗木的可溶性蛋白含量及相对电导率随干旱胁迫强度的增加而增加．在干旱胁迫下，POD活性与CAT活性及脯氨酸含量、可溶性糖含量与脯氨酸含量的关系密切．在轻度干旱胁迫下，皂角表现出一定的抗旱性，可能与POD、CAT活性和渗透调节物质的影响有关．

Physiological and Biochemical Responses of Gleditsia sinensis Seedlings to Drought Stress

One-year-old seedlings of Gleditsia sinensis were studied under drought stress condition in order to evaluate their physiological and biochemical characteristics. With the increase of intensity of drought stress, SOD activity decreased and then increased, the activities of CAT and POD, proline content, the content of soluble sugar and MDA content showed an increase-and then-decrease trend, whereas soluble protein content and relative conductance rate kept a continual increasing trend. Under drought stress condition, POD activity was closely related to CAT activity and proline content. The content of soluble sugar was closely related to proline content. Under light drought stress condition, seedlings of Gleditsia sinensis showed up certain resistance to drought which was probably affected by POD, CAT and osmotic adjustment substances.