Jingna Du, Chongling Yan, Zhaodeng Li.Environ

Sci Pollut Res.2014 (21):355–365

This

study focused on the cadmium (Cd) toleranceof mangroves with application of

phosphate (P) in order toexplore whether exogenous P can alleviate Cd stress on

theseintertidal species. Kandelia obovata (S. L.) seedlings werecultivated in

rhizoboxes under different levels of Cd and Pconcentrations. The speciation

distributions of Cd in therhizosphere and non-rhizosphere sediments were

examinedby sequential extraction procedures; organic acid in planttissues and

soil solution was measured by high-performanceliquid chromatography; Cd and P

accumulation in the plantswas also determined. Results showed that considerable

differences existed in Cd speciation distributions between rhizosphere and

non-rhizosphere sediments. Root activityinfluenced the dynamics of Cd, P

application increased theorganic acid content in root tissues, P also increased

Cdaccumulation in roots whilst lowering Cd translocation fromroot to the

above-ground tissues, and a significant positivecorrelation was found between

Cd and P in roots (r=0.905).It is postulated that Cd detoxification of K.

obovata (S. L.) isassociated with higher Cd immobilization in the presence

ofhigher P and organic acid contents in root tissue.

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