Indole-3-acetic acid promotes growth in bloom-forming Microcystis via an antioxidant response.

Autor: Baylous HR; Department of Biology, James Madison University, Harrisonburg, VA 22801, USA., Gladfelter MF; School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA., Gardner MI; Department of Biology, James Madison University, Harrisonburg, VA 22801, USA., Foley M; Department of Biology, James Madison University, Harrisonburg, VA 22801, USA., Wilson AE; School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA., Steffen MM; Department of Biology, James Madison University, Harrisonburg, VA 22801, USA. Electronic address: steffemm@jmu.edu.
Jazyk: angličtina
Zdroj: Harmful algae [Harmful Algae] 2024 Mar; Vol. 133, pp. 102575. Date of Electronic Publication: 2024 Jan 20.
DOI: 10.1016/j.hal.2024.102575
Abstrakt: Interactions between bacteria and phytoplankton in the phycosphere facilitate and constrain biogeochemical cycling in aquatic ecosystems. Indole-3-acetic acid (IAA) is a bacterially produced chemical signal that promotes growth of phytoplankton and plants. Here, we explored the impact of IAA on bloom-forming cyanobacteria and their associated bacteria. Exposure to IAA and its precursor, tryptophan, resulted in a strong growth response in a bloom of the freshwater cyanobacterium, Microcystis. Metatranscriptome analysis revealed the induction of an antioxidant response in Microcystis upon exposure to IAA, potentially allowing populations to increase photosynthetic rate and overcome internally generated reactive oxygen. Our data reveal that co-occurring bacteria within the phycosphere microbiome exhibit a division of labor for supportive functions, such as nutrient mineralization and transport, vitamin synthesis, and reactive oxygen neutralization. These complex dynamics within the Microcystis phycosphere microbiome are an example of interactions within a microenvironment that can have ecosystem-scale consequences.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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