期刊
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
卷 8, 期 2, 页码 226-238出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-013-0582-4
关键词
cadmium (Cd); low-Cd cultivar; pakchoi (Brassica chinensis L.); subcellular distribution; chemical forms
资金
- National Natural Science Foundation of China [20877104]
- Key Research Project of Guangdong Province [2009B030802006]
- State Key Project for Science and Technology Development of China [2009ZX07211-002-3]
Subcellular distributions and chemical forms of cadmium (Cd) in the leaves, stems and roots were investigated in low-Cd accumulation cultivars and high-Cd accumulation cultivars of pakchoi (Brassica chinensis L.). Root cell wall played a key role in limiting soil Cd from entering the protoplast, especially in the low-Cd cultivars. The high-Cd cultivars had significantly higher leaf and stem Cd concentrations than the low-Cd cultivars in cell wall fraction, chloroplast/trophoplast fraction, organelle fraction and soluble fraction. In low-Cd cultivars, which were more sensitive and thus had greater physiological needs of Cd detoxification than high-Cd cultivars, leaf vacuole sequestrated higher proportions of Cd. Cd in the form of pectate/protein complexes (extracted by 1 mol.L-1 NaCl) played a decisive role in Cd translocation from root to shoot, which might be one of the mechanisms that led to the differences in shoot Cd accumulation between the two types of cultivars. Furthermore, the formation of Cd-phosphate complexes (extracted by 2% HAc) was also involved in Cd detoxification within the roots of pakchoi under high Cd stress, suggesting that the mechanisms of Cd detoxification might be different between low- and high-Cd cultivars.
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