Jingna Du, Chongling Yan, Zhaodeng Li.Marine

Pollution Bulletin.2013 (74): 105-109

In

this study, a pot experiment was conducted to investigate the formation of iron

plaque under Cd stress and its role in Cd uptake and translocation by mangrove

Kandalar. Obovata (S.L.). Results showed:

1.

the Fe in dithionite–citrate–bicarbonate (DCB) extracts

increased with an increasing rate of Cd treatments.

2.

the Cd in DCB extracts and in roots and above-ground tissues significantly

increased with an increasing Cd application;

3.

significant positive correlation between concentration of Cd and Fe in DCB

extracts existed (p < 0.05);

4.

the proportion of Cd in DCB extracts was significantly lower than that in roots

or above-ground tissues (p < 0.001).

In

conclusion, formation of Fe plaque can precipitate Cd on root surfaces and

impede its uptake and translocation in Kandalar. Obovata (S.L.). However, in

comparison with root tissues, Fe plaque is of little significance. It is the

mangrove root tissue that acts as the main buffer to Cd uptake and

translocation.

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