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Auxins of microbial origin and their use in agriculture

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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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