title: Phosphorus and cadmium interactions in Kandelia obovata (S. L.) in relation to cadmium tolerance.
abstract: This study focused on the cadmium (Cd) tolerance of mangroves with application of phosphate (P) in order to explore whether exogenous P can alleviate Cd stress on these intertidal species. Kandelia obovata (S. L.) seedlings were cultivated in rhizoboxes under different levels of Cd and P concentrations. The speciation distributions of Cd in the rhizosphere and non-rhizosphere sediments were examined by sequential extraction procedures; organic acid in plant tissues and soil solution was measured by high-performance liquid chromatography; Cd and P accumulation in the plants was also determined. Results showed that considerable differences existed in Cd speciation distributions between rhizosphere and non-rhizosphere sediments. Root activity influenced the dynamics of Cd, P application increased the organic acid content in root tissues, P also increased Cd accumulation in roots whilst lowering Cd translocation from root to the above-ground tissues, and a significant positive correlation was found between Cd and P in roots (r = 0.905). It is postulated that Cd detoxification of K. obovata (S. L.) is associated with higher Cd immobilization in the presence of higher P and organic acid contents in root tissue.
authors.affiliation: Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361005, China.
authors.forename: Jingna
authors.initials: J
authors.lastname: Du
authors.forename: Chongling
authors.initials: C
authors.lastname: Yan
authors.forename: Zhaodeng
authors.initials: Z
authors.lastname: Li
mesh_terms: D000222:Adaptation, Physiological; D002104:Cadmium / Q000737:chemistry* / Q000633:toxicity; D010758:Phosphorus / Q000737:chemistry* / Q000633:toxicity; D018517:Plant Roots / Q000502:physiology; D043982:Rhizophoraceae / Q000502:physiology*; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry
chemical_list: D012987:Soil; D002104:Cadmium; D010758:Phosphorus