Nitrogen Fixation Activity and Genome Analysis of a Moderately Haloalkaliphilic Anoxygenic Phototrophic Bacterium Rhodovulum tesquicola

Комова, А. В.; Bakhmutova, Elizaveta D.; Izotova, A. O.; Kochetova, Evelina S.; Toshchakov, Stepan V.; Намсараев, З. Б.; Golichenkov, M. V.; Korzhenkov, Aleksei A.

doi:10.3390/microorganisms10081615

Cited by 1 publication

(1 citation statement)

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“…These associations between seagrass and sulfide-oxidizing bacteria could alleviate toxic sulfate accumulation, produce higher biomass and form more complex rhizome structures [ 118 ]. Besides, some other enriched bacteria, such as Psychromonas (enriched in SJSW) [ 119 ] and Rhodobacteraceae (enriched in SJRS) [ 120 ], are capable of nitrite reduction, nitrate assimilation and/or nitrogen fixation, which may aid Z. marina in maintaining health under kelp culture pressure. MAGs of Rhodobacteraceae were also obtained from the metagenomic data, and these bacteria had potential nitrogen fixation ability with NifU annotated.…”

Section: Discussionmentioning

confidence: 99%

Novel insights into the rhizosphere and seawater microbiome of Zostera marina in diverse mariculture zones

Sun,

Wang,

Liu

et al. 2024

Microbiome

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Background Seagrasses offer various ecosystem services and possess high levels of primary productivity. However, the development of mariculture has affected the homeostasis of seagrass meadow ecosystems. Plant-microbiome associations are essential for seagrasses health, but little is known about the role of environmental microbiomes and how they affect seagrass in a mariculture environment. In this study, we investigated the influence of mariculture on the rhizosphere and seawater microbiome surrounding Zostera marina and focused on the bacterial, eukaryotic, and fungal components in the composition, diversity, metabolism, and responses to mariculture-related environmental factors. Results Significant differences in the composition, richness, diversity, and internal relations of the bacterial community between the seawater and rhizosphere sediment surrounding Z. marina were observed, while differences in the eukaryotic and fungal communities were less significant. More complex bacterial and fungal co-occurrence networks were found in the seawater and rhizosphere sediment of the Saccharina japonica (SJ) and sea cucumber (SC) culture zones. The seawater in the SJ zone had higher levels of dissimilatory and assimilatory nitrate reduction, denitrification, and nitrogen fixation processes than the other three zones. The assimilatory sulfate reduction enzymes were higher in the rhizosphere sediments of the SJ zone than in the other three zones. Tetracycline, sulfonamide, and diaminopyrimidine resistance genes were enriched in the mariculture SJ and SC zones. Conclusions Our findings might contribute to a better understanding of the effects of mariculture on the seagrass and the meadow ecosystems and thus revealing their potential operating mechanisms. These insights may serve to raise awareness of the effects of human activities on natural ecosystems, regulation of antibiotic usage, and environmental restoration.

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Section: Discussionmentioning

confidence: 99%