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Phosphorus mediation of cadmium stress in two mangrove seedlings Avicennia marina and Kandelia obovata differing in cadmium accumulation
- Dai, Minyue, Lu, Haoliang, Liu, Wenwen, Jia, Hui, Hong, Hualong, Liu, Jingchun, Yan, Chongling
- Ecotoxicology and environmental safety 2017 v.139 pp. 272-279
- Avicennia marina, Kandelia, cadmium, ecosystems, glutathione, hydroponics, leaves, malondialdehyde, phosphorus, photosynthesis, physiological response, phytochelatins, proline, roots, secretion, seedlings, thiols
- Mangrove ecosystems are vulnerable to environmental threats. In order to elucidate the effect of phosphorus (P) on cadmium (Cd) tolerance and physiological responses in mangroves under Cd stress, a mangrove specie with salt exclusion Kandelia obovata and a specie with salt secretion Avicennia marina were compared in a hydroponic experiment. The results showed that most Cd was accumulated in mangrove roots and that P addition induced Cd immobilisation in them. Cd stress significantly increased malonaldehyde content, whereas P significantly decreased malonaldehyde in mangroves. Phosphorus positively regulated the photosynthetic pigment, proline content and synthesis of non-protein thiols, glutathione and phytochelatins in the leaves under Cd stress conditions. The results suggest different adaptive strategies adopted by two mangroves in a complex environment and A. marina showed a stronger Cd tolerance than K. obovata. The study provides a theoretical basis for P mediated detoxification of Cd in mangrove plants.