Title: Effects of lead stress on growth and physiological index in leaves of tomato
Abstract:The growth and some physiological indexes in leaves of tomato plant grown in a nutrient solution containing different lead concentrations for 7 days were observed. The result showed that :the green de...The growth and some physiological indexes in leaves of tomato plant grown in a nutrient solution containing different lead concentrations for 7 days were observed. The result showed that :the green deficiency symptoms in the old leaves of tomato were visible when the lead concentration in nutrient solution was more than 1 000mg·L~(-1). The chlorophyll(Chl) content was obviously reduced with increasing concentration of lead. when the lead concentration in nutrient solution was 1 500mg·L~(-1), the Chl content decreased 84.63% in comparison with the control(no lead). Meanwhile, with increasing concentration of lead, the relative membrane permeability and malondialdehyde(MDA) content in leaves were significantly enhanced. There was a positive correlation between the relative membrane permeability,MDA content and the lead concentration.The coefficient of correlation is 0.89,0.82 respectively. The Chl content and the relative membrane permeability presented a significant negative correlation.The coefficient of correlation is 0.99. The activity of peroxidase(POD) were irregular to the lead concentration. However, the activity of catalase(CAT) was first stimulated and then inhibited with increasing concentration of lead.Read More
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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