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The Potential of Rhizobacteria for Plant Growth and Stress Adaptation

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Re-visiting the Rhizosphere Eco-system for Agricultural Sustainability

Part of the book series: Rhizosphere Biology ((RHBIO))

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Abstract

Plants host a very rich microbiome comprising fungi, bacteria, and protozoa. Bacteria proliferate inside tissues or around roots, where carbon-rich compounds exert positive chemotaxis. Many physiological functions in crops are related to symbiotic events with Gram-positive or Gram-negative bacteria, which influence growth, development, nutrition, and immunity and fine-tune root tropisms. This potentiates the exploration of the substrate and may confer stress tolerance. The production of secondary metabolites and volatile compounds has been thoroughly investigated in Gram-positive bacteria in recent years, and a few of these info-chemicals increase the endogenous auxin levels and/or response, whereas Gram-negative species releases quorum-sensing signals of the N-acyl-homoserine type that are recognized by roots to strengthen root branching and immunity. This chapter reviews the contributions of rhizobacteria to enhance crop fitness in the field to make agriculture safer and more sustainable and highlights a few examples of how cross-kingdom signaling influences root behavior.

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Correspondence to José López-Bucio .

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Ravelo-Ortega, G., López-Bucio, J. (2022). The Potential of Rhizobacteria for Plant Growth and Stress Adaptation. In: Singh, U.B., Rai, J.P., Sharma, A.K. (eds) Re-visiting the Rhizosphere Eco-system for Agricultural Sustainability. Rhizosphere Biology. Springer, Singapore. https://doi.org/10.1007/978-981-19-4101-6_11

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