Genetic Evidence for Algal Auxin Production in and Its Role in Algal-bacterial Mutualism

Overview

Journal iScience

Publisher Cell Press

Date 2024 Jan 25

PMID 38269098

Authors

Victoria Calatrava

Erik F Y Hom

Qijie Guan

Angel Llamas

Emilio Fernandez

Aurora Galvan

Affiliations

Soon will be listed here.

Abstract

Interactions between algae and bacteria are ubiquitous and play fundamental roles in nutrient cycling and biomass production. Recent studies have shown that the plant auxin indole acetic acid (IAA) can mediate chemical crosstalk between algae and bacteria, resembling its role in plant-bacterial associations. Here, we report a mechanism for algal extracellular IAA production from L-tryptophan mediated by the enzyme L-amino acid oxidase (LAO1) in the model . High levels of IAA inhibit algal cell multiplication and chlorophyll degradation, and these inhibitory effects can be relieved by the presence of the plant-growth-promoting bacterium (PGPB) , whose growth is mutualistically enhanced by the presence of the alga. These findings reveal a complex interplay of microbial auxin production and degradation by algal-bacterial consortia and draws attention to potential ecophysiological roles of terrestrial microalgae and PGPB in association with land plants.

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