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Auxins of microbial origin and their use in agriculture

Applied Microbiology and Biotechnology volume 104, pages 8549–8565 (2020)Cite this article

Abstract

To maintain the world population demand, a sustainable agriculture is needed. Since current global vision is more friendly with the environment, eco-friendly alternatives are desirable. In this sense, plant growth–promoting rhizobacteria could be the choice for the management of soil-borne diseases of crop plants. These rhizobacteria secrete chemical compounds which act as phytohormones. Indole-3-acetic acid (IAA) is the most common plant hormone of the auxin class which regulates various processes of plant growth. IAA compound, in which structure can be found a carboxylic acid attached through a methylene group to the C-3 position of an indole ring, is produced both by plants and microorganisms. Plant growth–promoting rhizobacteria and fungi secrete IAA to promote the plant growth. In this review, IAA production and mechanisms of action by bacteria and fungi along with the metabolic pathways evolved in the IAA secretion and commercial prospects are revised.

Key points

• Many microorganisms produce auxins which help the plant growth promotion.

• These auxins improve the plant growth by several mechanisms.

• The auxins are produced through different mechanisms.

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All the authors have contributed equally, have read and approved the manuscript.

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Authors and Affiliations

  1. Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi, India

    Chetan Keswani & Surya Pratap Singh

  2. Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, India

    Satyendra Pratap Singh

  3. Instituto de Biotecnología de León (INBIOTEC), Parque Científico de León, Av, Real, 1, 24006, León, Spain

    Laura Cueto & Carlos García-Estrada

  4. Departamento de Ciencias Biomédicas, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain

    Carlos García-Estrada

  5. Département de Microbiologie Faculté SNV, LMA UFA Sétif 1, Sétif, Algeria

    Samia Mezaache-Aichour

  6. Bio-Protection Research Centre, Lincoln University, PO Box 85084, Lincoln, 7647, New Zealand

    Travis R. Glare

  7. Humboldt-Universität zu Berlin, Institut für Biologie, Berlin, Germany

    Rainer Borriss

  8. Nord Reet UG, Marienstr. 27a, 17489, Greifswald, Germany

    Rainer Borriss

  9. Instituto de Biología Molecular y Celular de Plantas, CSIC-Universitat Politècnica de València, 46022, Valencia, Spain

    Miguel Angel Blázquez

  10. Facultad De Ciencias Químicas, Benemérita Universidad Autónoma De Puebla, 72590, Puebla, Pue, México

    Estibaliz Sansinenea

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  1. Chetan Keswani
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  3. Laura Cueto
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  7. Rainer Borriss
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  8. Surya Pratap Singh
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  10. Estibaliz Sansinenea
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Keswani, C., Singh, S.P., Cueto, L. et al. Auxins of microbial origin and their use in agriculture. Appl Microbiol Biotechnol 104, 8549–8565 (2020). https://doi.org/10.1007/s00253-020-10890-8

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Keywords

  • Indole-3-acetic acid
  • Plant hormones
  • Plant growth
  • promoting bacteria