| Literature DB >> 18162271 |
Fanrong Zeng1, Song Chen, Ying Miao, Feibo Wu, Guoping Zhang.
Abstract
The effect of chromium (Cr) stress on the changes of rhizosphere pH, organic acid exudation, and Cr accumulation in plants was studied using two rice genotypes differing in grain Cr accumulation. The results showed that rhizosphere pH increased with increasing level of Cr in the culture solution and with an extended time of Cr exposure. Among the six organic acids examined in this experiment, oxalic and malic acid contents were relatively higher, and had a significant positive correlation with the rhizosphere pH, indicating that they play an important role in changing rhizosphere pH. The Cr content in roots was significantly higher than that in stems and leaves. Cr accumulation in plants was significantly and positively correlated with rhizosphere pH, and the exudation of oxalic, malic and citric acids, suggesting that an increase in rhizosphere pH, and exudation of oxalic, malic and citric acid enhances Cr accumulation in rice plants.Entities:
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Year: 2007 PMID： 18162271 DOI： 10.1016/j.envpol.2007.11.019
Source DB: PubMed Journal: Environ Pollut ISSN： 0269-7491 Impact factor: 8.071