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IAA production by Bacillus sp. JH 2‐2 promotes Indian mustard growth in the presence of hexavalent chromium
Author(s) -
Shim Jaehong,
Kim JinWon,
Shea Patrick J.,
Oh ByungTaek
Publication year - 2015
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.201400311
Subject(s) - brassica , hexavalent chromium , rhizosphere , phytoremediation , inoculation , strain (injury) , chromium , horticulture , rhizobacteria , bacillus (shape) , chemistry , botany , nuclear chemistry , bacteria , biology , microbiology and biotechnology , heavy metals , environmental chemistry , genetics , organic chemistry , anatomy
Bacillus sp. strain JH 2‐2, isolated from the rhizosphere of plants at a multi‐metal contaminated mine site, has the potential to reduce Cr(VI) to Cr(III) and promote plant growth by reducing Cr toxicity and producing IAA. The minimum inhibitory concentration of Cr(VI) to Bacillus sp. JH 2‐2 was 1000 mg L −1 and the strain reduced 99% of 10 mg Cr(VI) L −1 to Cr(IV) within 24 h. Lower Cr(VI) stress (10 mg L −1 ) stimulated IAA production, but much less IAA was produced at 30 or 50 mg Cr(VI) L −1 . Inoculation with Bacillus sp. JH 2‐2 increased the length of Brassica juncea L. roots by 364% and stems by 735% in the presence of 10 mg Cr(VI) L −1 from those of uninoculated control plants. These findings suggest potential use of Bacillus sp. JH 2‐2 to promote phytoremediation of soil contaminated with Cr(VI).