Journal of Tropical Oceanography >
Study on stress responses and bioaccumulation of multiple heavy metals by the leaves of Kandelia candel
Received date: 2009-02-12
Revised date: 2009-06-03
Online published: 2010-12-15
Supported by
国家自然科学基金项目(41076070); 中国科学院知识创新工程重要方向性项目(KSCX2-SW-132);“十一五”国家科技支撑
计划重点项目(2009BADB2B0606)
In order to probe into physiological effects of heavy metals on mangrove plant Kandelia candel, the changes of some physiological characteristics in the seedlings of Kandelia candel exposed to five various concentrations (T0, T1, T3, and T4) of multiple heavy metals (Cd, Pb, and Hg) for 30 days were studied using sand culture method. The results show that the concentration of Cd, Pb, and Hg in the leaves of Kandelia candel increased with increasing concentration of multiple heavy metals in the growth solution. The toxic effect and oxidative stress caused by heavy metals were evident by the reduction in photosynthetic pigments. Ascrobate (AsA) content increased up to T3 while down at T4. The content of glutathione (GSH) significantly increased when Kandelia candel was exposed to T2 and above. The activities of ascorbate peroxidase (APX) and glutathione reductase (GR) followed the same trends as AsA, which first increased up to T3 and then decreased. Glutathione peroxidase (GPX) activity showed significant induction at all heavy metal treatment. The results of the present study suggest that Kandelia candel was able to accumulate and tolerate heavy metals. Kandelia candel responded to heavy metals induced oxidative stress by modulating non-enzymatic antioxidants and enzymatic antioxidants.
HUANG Guo-yong,WANG You-shao,SUN Cui-ci,SONG Hui, . Study on stress responses and bioaccumulation of multiple heavy metals by the leaves of Kandelia candel[J]. Journal of Tropical Oceanography, 2010 , 29(6) : 104 -109 . DOI: 10.11978/j.issn.1009-5470.2010.06.104
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