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

IF 13.8 1区 生物学 Q1 MICROBIOLOGY Microbiome Pub Date : 2024-10-17 DOI:10.1186/s40168-024-01899-6
Abeeha Khalil, Anna R Bramucci, Amaranta Focardi, Nine Le Reun, Nathan L R Willams, Unnikrishnan Kuzhiumparambil, Jean-Baptiste Raina, Justin R Seymour
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Abstract

Background: Reciprocal 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.

Results: We 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.

Conclusion: Our 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.

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海洋细菌广泛产生植物生长促进激素及其对海洋硅藻生长的影响。
背景:浮游植物和细菌之间代谢产物的相互交换影响着这些微生物的适应性,最终决定了海洋生态系统的生产力。最近的证据表明,促进植物生长的激素可能是浮游植物-细菌互助合作关系中的关键代谢物,但人们对海洋细菌产生的促进植物生长的激素的多样性及其对浮游植物生长的具体影响知之甚少。在此,我们旨在研究海洋细菌产生 7 种植物生长促进激素的能力以及这些激素对放线菌生长的影响:结果:我们研究了 14 种能促进常见硅藻 Actinocyclus 生长的细菌菌株的植物生长促进激素合成能力。在所测试的细菌中,植物生长促进激素的生物合成无处不在。事实上,所有 14 株菌株都具有合成多种激素的基因组潜能,质谱分析证实,在 7 种测试的植物生长促进激素中,每种菌株至少能产生 6 种。其中一些植物生长促进激素,如黄铜内酯和反式玉米素,从未在海洋微生物中报道过。重要的是,所有菌株都能产生高浓度的吲哚-3-乙酸(IAA),并将其释放到周围环境中。此外,吲哚-3 乙酸的胞外浓度与每种菌株促进放线菌生长的能力呈正相关。当接种到腋生放线菌培养物中时,只有吲哚-3-乙酸和赤霉素能促进硅藻的生长,接触吲哚-3-乙酸的培养物细胞数量增加了两倍:我们的研究结果表明,海洋细菌产生的植物生长促进激素的种类比以前怀疑的要多得多,其中一些化合物能促进海洋硅藻的生长。这些发现表明,植物生长促进激素在微生物交流中发挥着重要作用,并拓宽了我们对其在海洋环境中作用的认识。视频摘要。
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来源期刊
Microbiome
Microbiome MICROBIOLOGY-
CiteScore
21.90
自引率
2.60%
发文量
198
审稿时长
4 weeks
期刊介绍: Microbiome is a journal that focuses on studies of microbiomes in humans, animals, plants, and the environment. It covers both natural and manipulated microbiomes, such as those in agriculture. The journal is interested in research that uses meta-omics approaches or novel bioinformatics tools and emphasizes the community/host interaction and structure-function relationship within the microbiome. Studies that go beyond descriptive omics surveys and include experimental or theoretical approaches will be considered for publication. The journal also encourages research that establishes cause and effect relationships and supports proposed microbiome functions. However, studies of individual microbial isolates/species without exploring their impact on the host or the complex microbiome structures and functions will not be considered for publication. Microbiome is indexed in BIOSIS, Current Contents, DOAJ, Embase, MEDLINE, PubMed, PubMed Central, and Science Citations Index Expanded.
期刊最新文献
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