Abstract
Plant microbiota that associate with pioneer plants are essential to their growth and adaptation to harsh conditions found in the Central Volcanic Zone of the Andes. In this sense, the rhizosphere of pioneer species represents a unique opportunity to examine how bacterial communities are recruited and support the growth of plants under abiotic stress conditions, such low nutrient availability, high solar irradiation, water scarcity, soil salinity, etc. In this study, we explored the community composition and potential functions of rhizobacteria obtained from specimens of Parastrephia quadrangularis (Meyen) Cabrera, commonly called Tola, grown on the slopes of the Guallatiri, Isluga, and Lascar volcanoes in the Atacama Desert of Chile by using 16S rRNA amplicon sequencing. Sequence analysis showed that the Actinobacteria, Proteobacteria, Acidobacteria, and Bacteroidetes were the most abundant phyla of the rhizobacterial communities examined. A similar diversity, richness, and abundance of OTUs were also observed in rhizosphere samples obtained from different plants. However, most of OTUs were not shared, suggesting that each plant recruits a specific rhizobacterial communities independently of volcanoes slope. Analyses of predicted functional activity indicated that the functions were mostly attributed to chemoheterotrophy and aerobic chemoheterotrophy, followed by nitrogen cycling (nitrate reduction and denitrification), and animal parasites or symbionts. In addition, co-occurrence analysis revealed that complex rhizobacterial interactions occur in P. quadrangularis rhizosphere and that members of the Patulibacteraceae comprise a keystone taxon. This study extends our understanding on the composition and functions of the rhizobiome, which is pivotal for the adaptability and colonization of pioneer plant to harsh conditions of the Atacama Desert, widely recognized as the driest place on planet Earth.
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Claims 6
Claim · model-written summary
Actinobacteria, Proteobacteria, Acidobacteria and Bacteroidetes were the most abundant phyla of the rhizobacterial communities.
- Taxon
- Parastrephia quadrangularis
Parastrephia quadrangularise0 - Interactor
- rhizobacterial communitiese1other
- Outcome
- most abundant phylae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“Actinobacteria, Proteobacteria, Acidobacteria, and Bacteroidetes were the most abundant phyla of the rhizobacterial communities examined”
Claim · model-written summary
Diversity, richness and abundance of OTUs were similar in rhizosphere samples from different plants.
- Taxon
- Parastrephia quadrangularisParastrephia quadrangularise0
- Organ / stage
- rhizospheree1
- Outcome
- diversity, richness, and abundance of OTUse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“A similar diversity, richness, and abundance of OTUs were also observed in rhizosphere samples obtained from different plants”
Claim · model-written summary
Most OTUs were not shared among plants, suggesting that each plant recruits a specific rhizobacterial community independently of volcano slope.
- Taxon
- Parastrephia quadrangularisParastrephia quadrangularise0
- Interactor
- rhizobacterial communitiese1other
- Outcome
- most of OTUs were not sharede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“most of OTUs were not shared, suggesting that each plant recruits a specific rhizobacterial communities independently of volcanoes slope”
Claim · model-written summary
Predicted functions were mostly chemoheterotrophy and aerobic chemoheterotrophy, followed by nitrogen cycling and animal parasites or symbionts.
- Taxon
- Parastrephia quadrangularisParastrephia quadrangularise0
- Outcome
- functions were mostly attributed to chemoheterotrophy and aerobic chemoheterotrophye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“the functions were mostly attributed to chemoheterotrophy and aerobic chemoheterotrophy, followed by nitrogen cycling (nitrate reduction and denitrification), and animal parasites or symbionts”
Claim · model-written summary
Co-occurrence analysis revealed complex rhizobacterial interactions in the P. quadrangularis rhizosphere.
- Taxon
- Parastrephia quadrangularisParastrephia quadrangularise0
- Organ / stage
- rhizospheree1
- Outcome
- complex rhizobacterial interactionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“complex rhizobacterial interactions occur in P. quadrangularis rhizosphere”
Claim · model-written summary
Members of the Patulibacteraceae comprise a keystone taxon in the rhizobacterial community.
- Taxon
- Parastrephia quadrangularisParastrephia quadrangularise0
- Interactor
- PatulibacteraceaePatulibacteraceaee1other
- Outcome
- keystone taxone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parastrephia quadrangularis”
e1“members of the Patulibacteraceae comprise a keystone taxon”