盐旱交叉胁迫对银沙槐幼苗生理生化特性的影响

以盆栽银沙槐（Ammodendron argenteum（Pall.）Kuntze）幼苗为材料,研究盐旱交叉胁迫对幼苗抗逆生理特性的影响,为其引种栽培提供理论依据。结果显示,随着交叉胁迫程度的加剧,银沙槐幼苗的根重比、根冠比、可溶性糖含量、叶绿素a/b（Chl a/Chl b）、类胡萝卜素（Car）含量显著上升,在各种重度胁迫处理下含量均维持在较高的水平;叶重比、根系活力、根系和叶片相对含水量（RWC）、叶绿素含量下降;过氧化氢酶（CAT）的活性呈现先上升后下降的趋势。分析认为银沙槐幼苗在盐旱交叉胁迫下表现出交叉适应性,适度的干旱胁迫可增加银沙槐的抗盐能力。

Effects of Salt-drought Intercross Stress on Physiological and Biochemical Characteristics of Ammodendron argenteum(Pall.)Kuntze Seedlings

Potted Ammodendron argenteum（Pall.） Kuntze seedlings were used to study the effects of salt-drought intercross stress on physiological and biochemical characteristics to supply the theoretical foundation for reprtroduction and cultivation.Results showed that root mass ratio,ratio of root and comb,soluble sugar content,Chl a/b,and carotenoid content increased significantly with intensified stress,and all remained at a high level under different severe stresses.In contrast,leaf mass ratio,root activity,relative water content,and chlorophyll content all decreased.Conversely,CAT activity first increased and then decreased with increasing intercross stress.Comprehensive analysis showed Ammodendron argenteum（Pall.） Kuntze seedlings had tolerance to intercross stress,which indicates that appropriate drought stress can increase seedling resistance to salt stress.