Effects of copper on growth, antioxidant enzymes and phenylalanine ammonia-lyase activities in Jatropha curcas L. seedling
2008
Gao, S.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering | Yan, R.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering | Cao, M.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering | Yang, W.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering | Wang, S.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering | Chen, F.,Sichuan Univ., Chengdu (China). Key Lab. of Resource Biology and Biopharmaceutical Engineering
The effects of different concentrations of copper (0-800 micromol) on growth, protein contents, peroxidase (POD), catalase (CAT), superoxide dismutase (SOD), and phenylalanine ammonia lyase (PAL) in Jatropha curcas seedlings were assessed by means of pot experiments. Increased Cu concentrations led to decreased shoot elongation and seedling biomass. Protein content in the leaves and roots reached their highest levels at the Cu concentrations of 400 micromol, while the highest protein content in the stem was observed at 800 micromol Cu. POD activity in leaves and stems was unaffected at low Cu concentrations, but showed a considerable variation at high Cu concentrations. In roots, the highest POD activity was observed at 200 micromol Cu. Under Cu stress, SOD activity in leaves increased concomitantly with increasing Cu up to 400 micromol, and SOD activity in stems and roots showed a slight increase. Catalase activity significantly elevated in leaves and roots but showed no significant changes in stems of the seedlings exposed to Cu. A gradual increase of PAL activity in leaves and roots at the Cu concentration of 400 and 200 micromol was observed, while PAL activity remained unchanged in stems.
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