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J Environ Sci (China). 2009;21(8):1125-8.

Cadmium uptake and speciation changes in the rhizosphere of cadmium accumulator and non-accumulator oilseed rape varieties.

Author information

1
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China. dcsu@cau.edu.cn

Abstract

Characteristics of cadmium (Cd) uptake kinetics and distribution of Cd speciation in the rhizosphere for Cd accumulator and non-accumulator oilseed rape varieties were investigated under nutrient solution and rhizobox soil culture conditions. The results showed that the maximal influx (V(max)) for Cd2+ and Km were significantly different for the two oilseed rape varieties. The value of V(max) for Cd accumulator oilseed rape Zhucang Huazi was two-fold greater than that for oilseed rape Chuan you II-93. The exchangeable Cd concentration in the rhizosphere was significantly lower than in non-rhizospheric soils supplemented with CdSO4 for both the varieties. Carbonate-bound Cd in the rhizosphere of Cd accumulator oilseed rape was significantly higher than that in the rhizosphere of non-accumulator oilseed rape and non-rhizospheric soil. Cd accumulator oilseed rape had a higher Cd2+ affinity and more ability to uptake insoluble Cd in the soil than the non-accumulator oilseed rape.

PMID:
19862927
DOI:
10.1016/s1001-0742(08)62391-8
[Indexed for MEDLINE]

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