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Research Journal of Botany
Year: 2006  |  Volume: 1  |  Issue: 1  |  Page No.: 24 - 29

Plant Growth Promotion by Brevibacterium under Chromium Stress

Muhammad Faisal and Shahida Hasnain    

Abstract: Three chromium resistant bacterial strains originally isolated from chromium-contaminated wastewater, were tested in the field experiments for the growth promotion of Helianthus annuus in the presence of different chromium salts. Much reduction in seed germination was observed under Cr(VI) stress but all bacterial strains promoted seed germination with respect to non-inoculated control. Inoculation increased plant length in sunflower by 14 to 26%. Sunflower plants showed medium and high increases in their fresh weight in response to inoculation with these strains. Inoculation with these strains increased dry weight up to 15% as compared to non-inoculated control. The contribution of the strains to promote auxin content in these plants varied from 88% when sunflower plants were inoculated with strain CrT-6, to 174% when strain CrM-6 was used. All the three strains showed similar effects in respect to chromium accumulation when supplied with 300 μg g-1 of K2CrO4.

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