Pedosphere 24(3): 322--329, 2014
ISSN 1002-0160/CN 32-1315/P
©2014 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Growth and Cd accumulation of Orychophragmus violaceus as affected by inoculation of Cd-tolerant bacterial strains |
LIANG Xia, HE Chi-Quan ，NI Gang, TANG Gui-E, CHEN Xue-Ping and LEI Yan-Ru |
| School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444(China) |
| ABSTRACT |
| Beneficial interactions between microorganisms and plants,particularly in the rhizosphere, are a research area of globalinterest. Four cadmium (Cd)-tolerant bacterial strains were isolated from heavy metal-contaminated sludge and their effects on Cd mobility in soil and root elongation and Cd accumulation of Orychophragmus violaceus were explored to identify the capability of metal-resistant rhizobacteria for promoting the growth of O. violaceus roots on Cd-contaminated soils. The isolated strains, namely, Bacillus subtilis, B. cereus, B. megaterium, and Pseudomonas aeruginosa,significantly enhanced the plant Cd accumulation. The Cd concentrations in the roots and shoots were increased by up to 2.29- and 2.86-fold, respectively, by inoculation of B. megaterium, as compared with the uninoculated control. The bacterial strains displayed different effects on the shoot biomass. Compared with the uninoculated plants, the shoot biomass of the inoculated plants was slightly increased by B. megaterium and significantly decreased by the other strains. B. megaterium was identified as the best candidate for enhancing Cd accumulation in O. violaceus. Thus, this study provides novel insight into the development of plant-microbe systems for phytoremediation. |
| Key Words: heavy metals, phytoremediation, plant-microbe systems, rhizobacteria,soil contamination |
| Citation: Liang, X., He, C. Q., Ni, G., TANG Gui-E, Chen, X. P. and Lei, Y. R. 2014. Growth and Cd accumulation of Orychophragmus violaceus as affected by inoculation of Cd-tolerant bacterial strains. Pedosphere. 24(3): 322-329. |
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