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Perspectives of PGPR in Agri-Ecosystems

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Bacteria in Agrobiology: Crop Ecosystems

Abstract

Bacteria inhabiting the rhizosphere and beneficial to plants are termed as plant growth-promoting rhizobacteria (PGPR). A putative rhizobacteria qualifies as PGPR when it is able to produce a positive effect on the plant upon inoculation, hence demonstrating good competitive skills over existing rhizosphere communities. Generally 2–5% of rhizosphere bacteria are PGPR. A thorough understanding of the PGPR action mechanisms is fundamental to manipulating the rhizosphere in order to maximize the process within the system that influence plant productivity. Scientists have divided the mechanism of action into direct and indirect. Direct mechanisms are those that occur inside the plant and directly affect the plants metabolism while indirect mechanisms require participation of the plants defensive metabolic process, which transduce the signal sent from the bacteria influencing the plant. PGPR benefit plants indirectly by providing protection against phytopathogens by production of secondary metabolites, while direct mechanisms include production of phytohormones, nitrogen fixation, and phosphate solubilization. Hence, these plant-associated bacteria have implications as biofertilizers. A better understanding of the challenges in the development of PGPR as efficient commercial bioinoculants would facilitate the use of these organisms for sustainable agricultural development. This review article provides an insight into some of the very basic characteristics that define the persona of a PGPR strain and the developmental challenges faced by it.

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Authors and Affiliations

  1. Department of Microbiology, Gujarat University, Ahmedabad, 380009, Gujarat, India

    Meenu Saraf

  2. Institute of Science, Nirma University, S. G. Highway, Ahmedabad, 382481, Gujarat, India

    Shalini Rajkumar & Tithi Saha

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  1. Meenu Saraf
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  2. Shalini Rajkumar
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  3. Tithi Saha
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Correspondence to Meenu Saraf .

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Editors and Affiliations

  1. , Dept. of Botany Microbiology, Gurukul Kangri University, Haridwar (Uttarakhand), 249404, India

    Dinesh K. Maheshwari

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Saraf, M., Rajkumar, S., Saha, T. (2011). Perspectives of PGPR in Agri-Ecosystems. In: Maheshwari, D. (eds) Bacteria in Agrobiology: Crop Ecosystems. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18357-7_13

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