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Growth stimulatory effect of Ochrobactrum intermedium and Bacillus cereus on Vigna radiata plants
Author(s) -
Faisal M.,
Hasnain S.
Publication year - 2006
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.2006.01977.x
Subject(s) - vigna , radiata , bioremediation , bacillus cereus , cereus , biology , rhizosphere , chromium , horticulture , germination , botany , inoculation , bacteria , chemistry , genetics , organic chemistry
Aims: This study assessed the plant growth‐promoting ability of the bacterial strains Ochrobactrum intermedium (isolate CrT‐1) and Bacillus cereus (isolate S‐6). Methods and Results: Two chromium resistant bacterial strains isolated from chromium‐contaminated wastewater and soils were identified as O. intermedium CrT‐1 and B. cereus S‐6. These strains were inoculated on seeds of mungbean Vigna radiata var NM‐92, which were germinated and grown under chromate salts (300 μ g ml −1 of CrCl 3 or K 2 CrO 4 ). The data show that Cr(VI) was more toxic because of its better availability to plants roots when compared with Cr(III). The major part of Cr(VI) supplied to the seedlings was reduced to Cr(III) in the rhizosphere by the bacterial strains, thus lowering the toxicity of chromium to seedlings. Conclusions: Strains have significant Cr(VI) resistance and reduction potential and have ability to enhance mungbean plant growth under chromium stress. Significance and Impact of the study: These strains could be utilized for the growth of economically important cash crops as well as for the bioremediation of chromium‐polluted soils.