Abstract
The rhizosphere is a hot spot for bidirectional plant-microbe interaction that occurs through the exchange of signals between both the partners. Due to the sessile nature of plants, it utilizes crying-for-help strategies to combat various biotic and abiotic challenges by producing a wide array of root exudates and root volatile compounds in the rhizosphere. Whereas microbe releases various microbial volatile organic compounds (MVOCs), phytohormones, quorum-sensing compounds, and establish a relationship with plants. Such signal compounds determine the structure, abundance, and richness of the rhizomicrobiome (rhizobiome). We know the role of specific plant-microbe interactions, e.g., Rhizobium and legumes, mycorrhizae with roots of higher plants, and some plant growth-promoting rhizobacteria (PGPR) and plant growth-promoting fungi (PGPF) with plants.
Nevertheless, several unknown signals and their role in specific interactions have yet to be understood. In this chapter, (i) we will discuss the role of plant-microbe signaling in shaping the rhizomicrobiome population, (ii) chemo-attraction of beneficial PGPR and PGPF (iii), the role of microbe-plant signaling in priming and eliciting the induced systemic response (ISR) and systemic acquired resistance (SAR), (iv) modification of host plant gene expression, and regulation of hormones (salicylic acid (SA), jasmonic acid (JA), and ethylene (ET)) and their role in biotic and abiotic stress management, and (vi) intra- and inter-specific signal exchanges of quorum sensing (QS) molecules, volatile organic compounds, and microbial phytohormones are described. We will also discuss the role of plant and microbial signal in rhizosphere functioning and sustainability as an alternative solution for increased plant fitness.
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Acknowledgments
Hemant S. Maheshwari acknowledges the Ministry of Agriculture and Farmer Welfare, Govt of India and Director, ICAR-Indian Institute of Soybean Research, Khandwa Road, Indore-452001, India for providing financial assistance for pursuing doctoral studies at the University of Groningen, the Netherlands (ICAR-NS-IF-2017), under the supervision of Dr. J.T.M Elzenga (Professor, Ecophysiology of Plants Lab, University of Groningen, the Netherlands).
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Maheshwari, H.S. et al. (2020). Signaling in the Rhizosphere for Better Plant and Soil Health. In: Sharma, S.K., Singh, U.B., Sahu, P.K., Singh, H.V., Sharma, P.K. (eds) Rhizosphere Microbes. Microorganisms for Sustainability, vol 23. Springer, Singapore. https://doi.org/10.1007/978-981-15-9154-9_6
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