草业学报2012，Vol.21Issue(6)：82-93,12.
不同水分胁迫下水杨酸对分枝期扁蓿豆生长及光合生理的影响
Effects of salicylic acid on growth and photosynthetic characteristics of Melilotoides ruthenica in branching stage under different water stress
摘要
Abstract
The pot experiment was conducted to determine the effects of the different concentrations [0(The control) , 0. 02, 0. 10, 0. 50, 2. 50 mmol/L] of salicylic acid on the growth, the physiology characteristics and photosynthetic characteristics of Melilotoid.es ruthenica in branching stage under normal irrigation (80% field capacity), mild water stress (60% field capacity), moderate water stress (40% field capacity)and severe water stress (20% field capacity) in order to understand the effects of salicylic acid on drought tolerance of M. ruthenica in branching stage. The results showed that under mild and moderate water stress, treatment with 0. 1 mmol/L salicylic acid significantly increased leaf relative water content, chlorophyll content, soluble protein content, the activities of superoxide dismutase (SOD), peroxidase (POD) and catlase (CAT), photosynthetic rate (Pn) and stomatal conductance (Gs) compared with the control, but stomatal limitation value (Ls) were significantly decreased; Under severe water stress, treatment with 0. 5 mmol/L salicylic acid significantly increased plant height, primary shoot number, leaf area, leaf relative water content, chlorophyll content, free proline content, soluble protein content, the activities of SOD, POD and CAT, Pn, Gs and water use efficiency (WUE) compared with the control, but electrolyte leakage, malondialdehyde (MDA) content and Ls were significantly decreased. The results suggested that salicylic acid with the appropriate concentrations could increase the drought resistance of M. ruthenica and improve its growth in branching stage under water stress.关键词
扁蓿豆/水杨酸/水分胁迫/分枝期/生理指标/光合特性Key words
Melilotoides ruthenica / salicylic acid/ the water stress/ branching stage/ physiology characteristics/ photosynthetic characteristics分类
农业科技引用本文复制引用
崔秀妹,刘信宝,李志华,孙凯燕,李卉,张婷婷..不同水分胁迫下水杨酸对分枝期扁蓿豆生长及光合生理的影响[J].草业学报,2012,21(6):82-93,12.基金项目
"十二五"农村领域国家科技计划项目(2011BAD17B03)和南京农业大学校级SRT(1115A27)项目资助. （2011BAD17B03）
