Bacterial Community Assembly, Succession, and Metabolic Function during Outdoor Cultivation of Microchloropsis salina
Abstract
Outdoor cultivation of microalgae has promising potential for renewable bioenergy, but there is a knowledge gap on the structure and function of the algal microbiome that coinhabits these ecosystems. Here, we describe the assembly mechanisms, taxonomic structure, and metabolic potential of bacteria associated with Microchloropsis salina cultivated outdoors. Open mesocosms were inoculated with algal cultures that were either free of bacteria or coincubated with one of two different strains of alga-associated bacteria and were sampled across five time points taken over multiple harvesting rounds of a 40-day experiment. Using quantitative analyses of metagenome-assembled genomes (MAGs), we tracked bacterial community compositional abundance and taxon-specific functional capacity involved in algal-bacterial interactions. One of the inoculated bacteria (Alteromonas sp.) persisted and dispersed across mesocosms, whereas the other inoculated strain (Phaeobacter gallaeciensis) disappeared by day 17 while a taxonomically similar but functionally distinct Phaeobacter strain became established. The inoculated strains were less abundant than 6 numerically dominant newly recruited taxa with functional capacities for mutualistic or saprophytic lifestyles, suggesting a generalist approach to persistence. This includes a highly abundant unclassified Rhodobacteraceae species that fluctuated between 25% and 77% of the total community. Overall, we did not find evidence for priority effects exerted by themore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); University of the Philippines, Quezon City (Philippines)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1876956
- Report Number(s):
- LLNL-JRNL-823856
Journal ID: ISSN 2379-5042; 1036966
- Grant/Contract Number:
- AC52-07NA27344; SCW1039; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- mSphere
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2379-5042
- Publisher:
- American Society for Microbiology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; algae-bacteria interactions; metagenome-assembled-genomes; community assembly; rhodobacteraceae; microchloropsis
Citation Formats
Morris, Megan M., Kimbrel, Jeffrey A., Geng, Haifeng, Tran-Gyamfi, Mary Bao, Yu, Eizadora T., Sale, Kenneth L., Lane, Todd W., and Mayali, Xavier. Bacterial Community Assembly, Succession, and Metabolic Function during Outdoor Cultivation of Microchloropsis salina. United States: N. p., 2022.
Web. doi:10.1128/msphere.00231-22.
Morris, Megan M., Kimbrel, Jeffrey A., Geng, Haifeng, Tran-Gyamfi, Mary Bao, Yu, Eizadora T., Sale, Kenneth L., Lane, Todd W., & Mayali, Xavier. Bacterial Community Assembly, Succession, and Metabolic Function during Outdoor Cultivation of Microchloropsis salina. United States. https://doi.org/10.1128/msphere.00231-22
Morris, Megan M., Kimbrel, Jeffrey A., Geng, Haifeng, Tran-Gyamfi, Mary Bao, Yu, Eizadora T., Sale, Kenneth L., Lane, Todd W., and Mayali, Xavier. Wed .
"Bacterial Community Assembly, Succession, and Metabolic Function during Outdoor Cultivation of Microchloropsis salina". United States. https://doi.org/10.1128/msphere.00231-22. https://www.osti.gov/servlets/purl/1876956.
@article{osti_1876956,
title = {Bacterial Community Assembly, Succession, and Metabolic Function during Outdoor Cultivation of Microchloropsis salina},
author = {Morris, Megan M. and Kimbrel, Jeffrey A. and Geng, Haifeng and Tran-Gyamfi, Mary Bao and Yu, Eizadora T. and Sale, Kenneth L. and Lane, Todd W. and Mayali, Xavier},
abstractNote = {Outdoor cultivation of microalgae has promising potential for renewable bioenergy, but there is a knowledge gap on the structure and function of the algal microbiome that coinhabits these ecosystems. Here, we describe the assembly mechanisms, taxonomic structure, and metabolic potential of bacteria associated with Microchloropsis salina cultivated outdoors. Open mesocosms were inoculated with algal cultures that were either free of bacteria or coincubated with one of two different strains of alga-associated bacteria and were sampled across five time points taken over multiple harvesting rounds of a 40-day experiment. Using quantitative analyses of metagenome-assembled genomes (MAGs), we tracked bacterial community compositional abundance and taxon-specific functional capacity involved in algal-bacterial interactions. One of the inoculated bacteria (Alteromonas sp.) persisted and dispersed across mesocosms, whereas the other inoculated strain (Phaeobacter gallaeciensis) disappeared by day 17 while a taxonomically similar but functionally distinct Phaeobacter strain became established. The inoculated strains were less abundant than 6 numerically dominant newly recruited taxa with functional capacities for mutualistic or saprophytic lifestyles, suggesting a generalist approach to persistence. This includes a highly abundant unclassified Rhodobacteraceae species that fluctuated between 25% and 77% of the total community. Overall, we did not find evidence for priority effects exerted by the distinct inoculum conditions; all mesocosms converged with similar microbial community compositions by the end of the experiment. Instead, we infer that the 15 total populations were retained due to host selection, as they showed high metabolic potential for algal-bacterial interactions such as recycling alga-produced carbon and nitrogen and production of vitamins and secondary metabolites associated with algal growth and senescence, including B vitamins, tropodithietic acid, and roseobacticides.},
doi = {10.1128/msphere.00231-22},
journal = {mSphere},
number = 4,
volume = 7,
place = {United States},
year = {Wed Jun 22 00:00:00 EDT 2022},
month = {Wed Jun 22 00:00:00 EDT 2022}
}
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