Indole-3-acetic acid promotes growth in bloom-forming Microcystis via an antioxidant response.
Harmful Algae
; 133: 102575, 2024 03.
Article
em En
| MEDLINE
| ID: mdl-38485434
ABSTRACT
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.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cianobactérias
/
Microcystis
/
Microbiota
/
Ácidos Indolacéticos
Idioma:
En
Revista:
Harmful Algae
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Estados Unidos