草业学报2016，Vol.25Issue(8)：74-80,7.DOI:10.11686/cyxb2016085
水杨酸对盐胁迫下沙打旺幼苗生长的影响
Effects of salicylic acid on growth ofAstragalus adsurgens seedlings under salt stress
摘要
Abstract
Salicylic acid (SA)has emerged as a plant hormone involved in the processes of growth and develop-ment,and induced resistance to various abiotic stresses in plants.Studies of the effects of exogenous SA on the growth of Astragalus adsurgens under salt stress will uncover the underlying mechanisms of stress relief. Seedlings of A.adsurgens were treated with 200 mmol/L NaCl and different concentrations of SA (0.2,0.4, 0.6,0.8 & 1.0 mmol/L);growth and physiological indexes were subsequently determined.The results showed that,compared with NaCl treatment without SA,exogenous SA ranging from 0.4 to 0.8 mmol/L in-creased soluble protein content and the activity of superoxide dismutase (SOD)in leaves of A.adsurgens .Sol-uble protein content increased by 51.9% and 42.6% respectively under 0.6 and 0.8 mmol/L exogenous SA treatments and the activity of SOD increased significantly by 1.58 and 1.68 times under 0.4 and 0.6 mmol/L SA concentrations.Leaf membrane permeability was reduced by SA.SA at 0.4,0.6 and 0.8 mmol/L reduced leaf conductivity by 19.2%,26.6% and 18.1% respectively.The photosynthetic capacity of A.adsurgens was also enhanced by exogenous SA treatment.For example,the net photosynthetic rate increased by 1.21 and 1.43 times under 0.4 and 0.6 mmol/L SA treatment.All SA treatments resulted in increased plant height and dry weight in A.adsurgens seedlings.The optimal level of exogenous SA was 0.6 mmol/L.These results in-dicated that the growth of A.adsurgens under salt stress was enhanced by exogenous SA.关键词
沙打旺/水杨酸/盐胁迫/生长Key words
Astragalus adsurgens/salicylic acid/salt stress/growth引用本文复制引用
王宝增,张一名,张江丽,秘树青,孔红..水杨酸对盐胁迫下沙打旺幼苗生长的影响[J].草业学报,2016,25(8):74-80,7.基金项目
廊坊师范学院科学研究项目（LSLY201403）和河北省科技支撑计划项目（13226430）资助。 （）
