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Drought-Tolerant Plant Growth-Promoting Rhizobacteria Associated with Millets

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Millet Rhizosphere

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

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Abstract

Millets are drought-resistant, low-maintenance crops, and are a perfect fit for multiple crop** systems under irrigated and dryland farming. Drought resilience in millets is partially attributed to the plant’s ability to selectively encourage the growth of drought-adaptive, multifarious plant growth-promoting rhizobacteria (PGPR). Beneficial PGPR plays a key role in aiding millet’s growth under water-limited stress conditions as well as protects the plants from various drought-associated biotic and other abiotic stresses. As a component of the plant-soil feedback mechanism, millets actively restructure the rhizosphere microbial assemblages, and their functions through modulations in the composition, and concentration of the root exudates. Therefore, microbiome engineering poses an interesting avenue for formulating a productive abiotic stress management system for crops cultivated under drought-related stress environments. Our current understanding of the complex crosstalk between root-associated microbes and crops are grown under drought is largely drawn from non-millet plants. Limited resources and studies have revealed that effective PGPR employs fundamental mechanisms of drought stress alleviation that include the regulation of phytohormones (auxin and cytokinin), solubilization of phosphate, production of ACC deaminase to lower ethylene level, accumulation of compatible solutes, etc. In this chapter, we discussed how millets exposed to water-limited conditions influence the rhizosphere microbial colonization as a component of the cry-for-help strategy. Additionally, we highlighted the role of beneficial PGPR and their core strategies of drought amelioration in various millet crops. We propose that future research efforts should attempt to elucidate the interactions of PGPR strains with the host plant in field conditions and to gain insights into PGPR-induced molecular and metabolic switches in millet crops.

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Authors and Affiliations

  1. DBT-Northeast Centre for Agricultural Biotechnology (DBT-NECAB), Assam Agricultural University, Jorhat, Assam, India

    Sudipta Sankar Bora,  Anshu & Madhumita Barooah

  2. Heredity Biosciences, Guwahati, Assam, India

    Priyadarshini Deka

  3. Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, Assam, India

    Madhumita Barooah

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  1. Sudipta Sankar Bora
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  2. Anshu
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  3. Priyadarshini Deka
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  4. Madhumita Barooah
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Correspondence to Madhumita Barooah .

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Editors and Affiliations

  1. Amity Institute of Nanotechnology, Amity University Uttar Pradesh, Noida, India

    Ramesh Namdeo Pudake

  2. Defence Research and Development Organisation, Delhi, India

    Maya Kumari

  3. Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, Noida, India

    Deepak Rameshwar Sapkal

  4. Department of Biological Sciences, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, India

    Anil Kumar Sharma

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Bora, S.S., Anshu, Deka, P., Barooah, M. (2023). Drought-Tolerant Plant Growth-Promoting Rhizobacteria Associated with Millets. In: Pudake, R.N., Kumari, M., Sapkal, D.R., Sharma, A.K. (eds) Millet Rhizosphere . Rhizosphere Biology. Springer, Singapore. https://doi.org/10.1007/978-981-99-2166-9_4

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