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Microbial Rhizobacteria-Mediated Signalling and Plant Growth Promotion

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Bioactive Molecules in Plant Defense

Abstract

Bacteria are the most abundant microorganisms in soil compared to fungi and other microbes. They play a major role in maintaining soil fertility and plant growth. The rhizosphere is the region of soil that is directly influenced by root exudates of plants and associated with several soil microbes. The root exudates offer carbon-rich nutrients to the microbes, which in turn promotes plant growth indirectly and has a significant role in chemotaxis and biofilm formation. The relationship creates a symbiotic association between plants and microorganisms as a beneficial role such as atmospheric nitrogen fixation, increasing the availability of plant nutrients as well as water, root architecture modification, phytohormone production, microbial volatile production and induced systemic resistance (ISR). During the tripartite (plant-pathogen-rhizobacteria) interaction, different signalling pathways, viz. jasmonic acid (JA), salicylic acid (SA) and ethylene (ET) are activated, which ultimately results in enhanced systemic resistance. JA regulates plant defence through intricate crosstalks with diverse signalling networks manipulated by other phytohormones such as salicylic acid (SA), ethylene (ET) and nitric oxide (NO). The role of non-secondary metabolites, volatile organic compounds and phytohormones in plant growth promotion and inducing resistance is discussed in the chapter.

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  1. Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, 641003, India

    G. Karthikeyan, L. Rajendran, M. Suganyadevi & T. Raguchander

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  2. L. Rajendran
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  4. T. Raguchander
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Correspondence to G. Karthikeyan .

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  1. Laboratory of Plant Healthcare and Diagnostics, PG Department of Biotechnology and Microbiology, Karnatak University, Dharwad, India

    Sudisha Jogaiah

  2. Arid Land Research Center, Tottori University, Tottori, Japan

    Mostafa Abdelrahman

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Karthikeyan, G., Rajendran, L., Suganyadevi, M., Raguchander, T. (2019). Microbial Rhizobacteria-Mediated Signalling and Plant Growth Promotion. In: Jogaiah, S., Abdelrahman, M. (eds) Bioactive Molecules in Plant Defense. Springer, Cham. https://doi.org/10.1007/978-3-030-27165-7_3

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