Cited by 62Plant-Microbe Interactions and ImmunityAlgal biology and biofuel productionLegume Nitrogen Fixing Symbiosis

Involvement of indole-3-acetic acid produced by Azospirillum brasilense in accumulating intracellular ammonium in Chlorella vulgaris

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Meza, Beatriz, de-Bashan, Luz E., Bashan, Yoav·2015·Research in Microbiology

Abstract

Accumulation of intracellular ammonium and activities of the enzymes glutamine synthetase (GS) and glutamate dehydrogenase (GDH) were measured when the microalgae Chlorella vulgaris was immobilized in alginate with either of two wild type strains of Azospirillum brasilense or their corresponding indole-3-acetic acid (IAA)-attenuated mutants. After 48 h of immobilization, both wild types induced higher levels of intracellular ammonium in the microalgae than their respective mutants; the more IAA produced, the higher the intracellular ammonium accumulated. Accumulation of intracellular ammonium in the cells of C. vulgaris followed application of four levels of exogenous IAA reported for A. brasilense and its IAA-attenuated mutants, which had a similar pattern for the first 24 h. This effect was transient and disappeared after 48 h of incubation. Immobilization of C. vulgaris with any bacteria strain induced higher GS activity. The bacterial strains also had GS activity, comparable to the activity detected in C. vulgaris, but weaker than when immobilized with the bacteria. When net activity was calculated, the wild type always induced higher GS activity than IAA-attenuated mutants. GDH activity in most microalgae/bacteria interactions resembled GS activity. When complementing IAA-attenuated mutants with exogenous IAA, GS activity in co-immobilized cultures matched those of the wild type A. brasilense immobilized with the microalga. Similarity occurred when the net GS activity was measured, and was higher with greater quantities of exogenous IAA. It is proposed that IAA produced by A. brasilense is involved in ammonium uptake and later assimilation by C. vulgaris.

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  • A. brasilense affects activities of key enzymes in metabolic pathways in Chlorella spp., resulting in enhancement of production of metabolites of biotechnological importance.

    “Several studies have shown that A. brasilense affects the activities of key enzymes in metabolic pathways in Chlorella spp., resulting in the enhancement in production of metabolites of biotechnological importance, as is discussed later.”

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Authors
Meza, B., de-Bashan, L. E., & Bashan, Y.
Affiliations
Centro de Investigaciones Biológicas del Noroeste S.C. (MX)
Venue
Research in Microbiology
Publisher
Elsevier BV
Published
2015-02
Volume
166
Issue
2
Pages
72-83
ISSN
  • 0769-2609 (ISSN-L)
  • 0923-2508
OpenAlex
W2155840931
Cited by
61
References
84
Citations by year
2026: 3 · 2025: 7 · 2024: 7 · 2023: 10 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 5 · 2018: 1 · 2017: 5 · 2016: 5 · 2015: 4
FWCI
5.45
Type
journal article
Language
en
Open access
Locations
  • Research in Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Consejo Nacional de Ciencia y Tecnología of Mexico (130656, 164548)
  • The Bashan Foundation
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant-Microbe Interactions and Immunity
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Legume Nitrogen Fixing Symbiosis
Keywords
indole-3-acetic acid, Azospirillum brasilense, Chlorella vulgaris, glutamine synthetase, glutamate dehydrogenase, ammonium assimilation, ammonium uptake, alginate immobilization, microalgae-bacteria interactions, plant growth-promoting rhizobacteria
MeSH terms
Alginates, Glutamate Dehydrogenase, Glutamate-Ammonia Ligase, Hexuronic Acids, Indoleacetic Acids, Azospirillum brasilense, Cells, Immobilized, Glucuronic Acid, Chlorella vulgaris, Microbial Interactions, Ammonium Compounds

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