Stress Signaling Role of Salicylic Acid to Cadmium-Induced Ozidative Stress
(0) This study was undertaken to determine the physiological and biochemical changes in pea plants treated by SA during Cd- induced stress, to investigate whether this plant regulator is involved in the induction of defense response and to test the hypothesis that the observed protection of SA on photosynthesis against Cd stress is mediated by its effect on antioxidant defense system. The exposure of plants to Cd caused a gradual decrease in shoot and root fresh weight accumulation, CO2 fixation rate and the activity of RuBPCase, the effect being most expressed in 1 and 2 μM Cd. In vivo the excess of Cd induced alterations in the redox cycling of oxygen evolving centers and the assimilatory capacity of the pea leaves as revealed by changes in the thermolumeniscence emission. Treatment of plants with Cd decreased the activity of APX but caused over twice increase in SOD activity. Seeds pretreatment with SA alleviated the negative effect of Cd on growth, photosynthesis, and led to decrease in oxidative injuries caused by Cd. Treatment with SA prevents the high accumulation of Cd in pea roots, SA accumulation alone was higher in control than Cd-treated plants. The data suggest that SA might protect cells against oxidative damage and prevent photosynthesis upon cadmium toxicity.
ozidative stress photosynthesis thermoluminiscence salicylic acid
L POPOVA L MASLENKOVA R YORDANOVA T JANDA G SZALAI
Acad M Popov Institute of Plant Physiolpgy,Bulg Acad Sci,Sofia,Bulgaria Agricultural Research Institute,Hung Acad Sci,Martonvasar,Hungary
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
511-518
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）