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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
Published on: July 13, 2016
Physiological and proteomic analyses reveal that phosphorus alleviates cadmium toxicity in Kandelia obovata roots
Weiwei Zhao1, Zhijun Shen2, Dan Yang3
1College of the Environment and Ecology, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China.
Abstract:
Elevated cadmium (Cd) exposure poses a significant threat to plant growth and productivity. Phosphorus (P) alleviates Cd toxicity in plants to some extent; however, the mechanisms underlying this effect remain poorly understood. In this study, the effect of phosphorus on cadmium toxicity was investigated using Kandelia obovata (S., L.) Yong roots from physiological and proteomic perspectives. Under Cd stress, P application was associated with enhanced root activity and antioxidant enzyme functions (peroxidase and superoxide dismutase) within the roots of Kandelia obovata, while concurrently reducing malondialdehyde levels. Proteomic analysis identified 494 and 110 differentially expressed proteins in the cadmium stress vs. the untreated control (Cd vs. CK) group and the exogenous phosphorus addition under Cd stress vs. the phosphorus-only treatment (HP + Cd vs. HP) group, respectively. Enrichment results indicated that P treatment was associated with metabolic adjustments related to cell wall biosynthesis, protein synthesis, and intracellular transport. These coordinated responses suggest that P supplementation may improve Cd tolerance in K. obovata roots.
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