Effects of Cadmium Stress on Antioxidant Enzyme Activities and Photosynthesis in Melon Seedlings

doi:10.11924/j.issn.1000-6850.casb15060050

Abstract

Abstract: The experiment was carried out on ‘Hamilv’ and ‘Xiulv’ in climate chambers and substrates to investigate the effects of cadmium stress on growth, antioxidant enzyme activities and photosynthesis of melon seedlings in order to explore the possible mechanisms of cadmium tolerance of melon. The results showed that, with the increasing cadmium concentration, melon-seedling growth, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and stomatal limitation (Ls) decreased; meanwhile, intercellular carbon dioxide concentration (Ci) increased significantly. The plant growth and photosynthetic apparatus of ‘Hamilv’ were less affected than that of ‘Xiulv’. Antioxidant enzyme activities and soluble protein content first increased, then decreased with the increasing concentration of cadmium. Proline content of ‘Hamilv’ increased significantly, meanwhile, the proline content of ‘Xiulv’ increased first followed by a decrease. With the increasing cadmium concentration, MDA content and O₂·^- producing rate increased and ‘Hamilv’ were less affected than ‘Xiulv’. These findings suggested that there was significant genotypical difference in melon in response to cadmium toxicity.

CLC Number:

S652.4

Zhang Yongping,Shen Ruogang,Yao Xueqin and Chen Youyuan. Effects of Cadmium Stress on Antioxidant Enzyme Activities and Photosynthesis in Melon Seedlings[J]. Chinese Agricultural Science Bulletin, 2015, 31(34): 82-88.

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