O PAPEL DAS BACTÉRIAS PRODUTORAS DE ÁCIDO INDOLACÉTICO (AIA) NO ENRAIZAMENTO E CRESCIMENTO VEGETAL

Abstract

Indoleacetic acid (IAA) is the main natural auxin involved in regulating plant growth-promoting bacteria. In recent years, the scientific community has focused its attention on the use of plant growth-promoting bacteria (PGPB), especially those capable of producing IAA, as a sustainable alternative to stimulate germination, rooting, and development in different plant species. This review brings together evidence from studies demonstrating the effectiveness of these bacteria in various agricultural crops and plant species, including vegetables and plants propagated by cuttings or micropropagation. Among the microorganisms most cited in the literature are species of the genera Rhizobium, Bacillus, Pseudomonas, Enterobacter, Pantoea, Burkholderia, and Azospirillum, recognized for their ability to synthesize IAA and promote plant growth. The results analyzed indicate that, when well selected, these bacteria have the potential to improve root development, promote nutrient absorption, and contribute to increased plant vigor, potentially reducing the use of synthetic inputs partially or totally. However, some studies indicate that excessive concentrations of IAA can cause negative physiological effects, highlighting the importance of proper management of these microorganisms. It is concluded that the rational use of AIA-producing bacteria represents a promising strategy for strengthening