Journal of Pure and Applied MicrobiologyVol. 9 No. 1

Does a Plant Growth Promoting Rhizobacteria Enhance Agricultural Sustainability?

Ashok Kumar1,2*, I. Bahadur1, B. R. Maurya1, R. Raghuwanshi2, V.S. Meena1, 3, D. K. Singh1 and J. Dixit1

1Department of Soil Science and Agricultural Chemistry, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi - 221 005, India. 2Department of Botany, MMV, Banaras Hindu University, Varanasi - 221 005, India. 3ICAR-Vivekananda Institute of Hill Agriculture, Almora - 263 601, Uttarakhand, India.

Received on 06 November 2014 and accepted on 30 December 2014

 

ABSTRACT

Rhizosphere soil has large diversity of microbial community, including microorganisms which caused plant growth promoting activity. The plant growth promoting rhizobacteria (PGPR) colonize roots, increased root branching, root number and enhanced growth through direct and indirect mechanisms. PGPR modified root architecture by production of phytohormones, siderophores, HCN, Nitrogen fixation and Phosphate solubilization mechanisms. PGPR also modify root functioning, improve plant nutrition and influence the physiology of the whole plant. N-fixers and P-solubilizers play key role in plant growth and yield of various crops. However the PGPR also play very crucial role to maintain the soil fertility and health. In this paper, we address the effect of PGPR on growth, yield and fertility status in rhizosphere soil. Synergetic interactions of combined inoculation of PGPR strains might be more effective for various crops growth and yield. PGPR along with integrated nutrient management may be more effective for growth, yield and fertility status under sustainable agriculture.

Keywords : N-fixers, PGPR, phytohormone, P-solubilizers, rhizosphere, Siderophores, Yield.