Productivity of greengram in tebuconazole-stressed soil, by using a tolerant and plant growth-promoting Bradyrhizobium sp. MRM6 strain

• Autorzy: Ahemad M. , Khan M. S.
• Języki publikacji: EN

Abstrakty

EN

In this study, a total of 50 rhizobial isolates were recovered from the root nodules of greengram plants. Of the 50 isolates, 9 bradyrhizobial strains namely, MRM1, MRM2, MRM3, MRM4, MRM5, MRM6, MRM7, MRM8, and MRM9, exhibiting a higher tolerance levels of 600, 800, 1,200, 1,000, 1,000, 1,600, 1,400, 1,400, and 1,000 µg ml⁻¹, respectively, to triazole fungicide tebuconazole (chromatographically pure) were selected and tested for plant growth-promoting activities. Generally, the rhizobial strain with maximum fungicide-tolerance ability produced higher amounts of plant growth-promoting substances. Among the nine bacterial strains, Bradyrhizobium strain MRM6 was preferably selected due to its ability to tolerate tebuconazole maximally (up to 1,600 µg ml⁻¹) on minimal salt agar medium. In addition, the strain MRM6 grew well in minimal salts medium supplemented with 100 (recommended), 200 (two times of the recommended), and 300 µg tebuconazole l⁻¹ (three times of the recommended rate) and synthesized highest amounts of plant growthpromoting substances like indole acetic acid, siderophores, exopolysaccharides, hydrogen cyanate, and ammonia, both in the absence and presence of 100, 200, and 300 µg l⁻¹ of tebuconazole. Following these properties, the strain MRM6 was used as inoculant and the inoculated greengram plants was raised in soils treated separately with recommended, two and three times the recommended dose of tebuconazole. Generally, tebuconazole at recommended and the higher rates decreased biomass, nodulation, nutrientuptake, and grain yield of uninoculated greengram plants. Interestingly, Bradyrhizobium sp. (vigna) strain MRM6 when used with any concentration of tebuconazole, significantly increased the measured phyto-chemical-parameters of greengram plants when compared with those grown in soils treated exclusively (without inoculant) with tebuconazole. This study inferred that the strain MRM6 of Bradyrhizobium sp. (vigna) was compatible with tebuconazole and may be co-inoculated with this fungicide for enhancing the production of legumes especially greengram in soils poisoned with fungicides.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2012
• Tom: 34
• Numer: 1
• Opis fizyczny: p.245-254,fig.,ref.

Twórcy

autor

Ahemad M.

• Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, UP, India

autor

Khan M. S.

• Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, UP, India

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