Evidence map›Paper›PMID 39420440›Full record

ArticleMicrobiome2024

Widespread production of plant growth-promoting hormones among marine bacteria and their impacts on the growth of a marine diatom.

Abeeha Khalil, Anna R Bramucci, Amaranta Focardi, Nine Le Reun, Nathan L R Willams, Unnikrishnan Kuzhiumparambil, Jean-Baptiste Raina, Justin R Seymour

Abstract read
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In one paragraph

Article in Microbiome, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

6 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Abeeha KhalilClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia. abeeha.khalil@student.uts.edu.au.
Anna R BramucciClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
Amaranta FocardiClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
Nine Le ReunClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
Nathan L R WillamsUniversity of Southern California, Los Angeles, CA, USA.
Unnikrishnan KuzhiumparambilClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
Jean-Baptiste RainaClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
Justin R SeymourClimate Change Cluster, University of Technology Sydney, Ultimo, NSW, 2007, Australia.

Funding

Australian Research Council Grant DP180100838Australian Research Council Grant FT210100100
6 · The paper itself

Abstract

backgroundReciprocal exchanges of metabolites between phytoplankton and bacteria influence the fitness of these microorganisms which ultimately shapes the productivity of marine ecosystems. Recent evidence suggests that plant growth-promoting hormones may be key metabolites within mutualistic phytoplankton-bacteria partnerships, but very little is known about the diversity of plant growth-promoting hormones produced by marine bacteria and their specific effects on phytoplankton growth. Here, we aimed to investigate the capacity of marine bacteria to produce 7 plant growth-promoting hormones and the effects of these hormones on Actinocyclus sp. growth.

resultsWe examined the plant growth-promoting hormone synthesis capabilities of 14 bacterial strains that enhance the growth of the common diatom Actinocyclus. Plant growth-promoting hormone biosynthesis was ubiquitous among the bacteria tested. Indeed all 14 strains displayed the genomic potential to synthesise multiple hormones, and mass-spectrometry confirmed that each strain produced at least 6 out of the 7 tested plant growth-promoting hormones. Some of the plant growth-promoting hormones identified here, such as brassinolide and trans-zeatin, have never been reported in marine microorganisms. Importantly, all strains produced the hormone indole-3 acetic acid (IAA) in high concentrations and released it into their surroundings. Furthermore, indole-3 acetic acid extracellular concentrations were positively correlated with the ability of each strain to promote Actinocyclus growth. When inoculated with axenic Actinocyclus cultures, only indole-3 acetic acid and gibberellic acid enhanced the growth of the diatom, with cultures exposed to indole-3 acetic acid exhibiting a two-fold increase in cell numbers.

conclusionOur results reveal that marine bacteria produce a much broader range of plant growth-promoting hormones than previously suspected and that some of these compounds enhance the growth of a marine diatom. These findings suggest plant growth-promoting hormones play a large role in microbial communication and broaden our knowledge of their fuctions in the marine environment. Video Abstract.

Indexed as

BacteriaDiatomsPlant Growth RegulatorsAquatic OrganismsIndoleacetic AcidsPhytoplanktonSeawaterSymbiosisindoleacetic acidIndoleacetic AcidsPlant Growth RegulatorsBacteria-phytoplankton interactionsMarine bacteriaMarine diatomPlant growth promoting hormonesSymbiosis

Identifiers

PMID39420440
PMCPMC11487934

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LicenceCC BY-NC-ND
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.