Plant growth promoting rhizobia: challenges and opportunities

Gopalakrishnan, S and Sathya, A and Vijayabharathi, R and Varshney, R K and Gowda, C L L and Krishnamurthy, L (2015) Plant growth promoting rhizobia: challenges and opportunities. 3 Biotech, 5 (4). pp. 355-377. ISSN 2190-5738

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Modern agriculture faces challenges, such as loss of soil fertility, fluctuating climatic factors and increasing pathogen and pest attacks. Sustainability and environmental safety of agricultural production relies on eco-friendly approaches like biofertilizers, biopesticides and crop residue return. The multiplicity of beneficial effects of microbial inoculants, particularly plant growth promoters (PGP), emphasizes the need for further strengthening the research and their use in modern agriculture. PGP inhabit the rhizosphere for nutrients from plant root exudates. By reaction, they help in (1) increased plant growth through soil nutrient enrichment by nitrogen fixation, phosphate solubilization, siderophore production and phytohormones production (2) increased plant protection by influencing cellulase, protease, lipase and β-1,3 glucanase productions and enhance plant defense by triggering induced systemic resistance through lipopolysaccharides, flagella, homoserine lactones, acetoin and butanediol against pests and pathogens. In addition, the PGP microbes contain useful variation for tolerating abiotic stresses like extremes of temperature, pH, salinity and drought; heavy metal and pesticide pollution. Seeking such tolerant PGP microbes is expected to offer enhanced plant growth and yield even under a combination of stresses. This review summarizes the PGP related research and its benefits, and highlights the benefits of PGP rhizobia belonging to the family Rhizobiaceae, Phyllobacteriaceae and Bradyrhizobiaceae

Item Type: Article
Divisions: RP-Grain Legumes
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Rhizobium; PGPR; Biocontrol; Stress; Heavymetal; Co-inoculation
Subjects: Mandate crops > Chickpea
Mandate crops > Pigeonpea
Depositing User: Ms K Syamalamba
Date Deposited: 05 Sep 2014 08:00
Last Modified: 21 Oct 2016 06:10
Official URL:
Acknowledgement: UNSPECIFIED
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