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Area of Science:

  • Microbiology
  • Plant Science
  • Environmental Science

Background:

  • The rhizosphere microbiome plays a crucial role in plant health and soil ecosystems, especially in extreme environments like Antarctica.
  • Understanding plant-microbe interactions is vital for assessing ecosystem resilience and function in polar regions.

Purpose of the Study:

  • To investigate and compare the rhizosphere microbiome of native Antarctic plants Deschampsia antarctica and Colobanthus quitensis.
  • To explore the influence of environmental factors, particularly soil temperature, on these microbial communities.
  • To predict the functional roles of the rhizosphere microbiome in Antarctic soil development and plant growth.

Main Methods:

  • 16S rRNA gene sequencing (metagenomics) was employed to characterize bacterial communities.
  • Comparative analysis was performed between Deschampsia antarctica, Colobanthus quitensis, and a related temperate species, D. cespitosa.
  • In silico metabolic predictions using PICRUSt 2.0 were utilized to infer functional capabilities.

Main Results:

  • Rhizosphere microbial communities of D. antarctica and D. cespitosa exhibited high taxon richness, contrasting with the lower diversity in C. quitensis.
  • Proteobacteria, Bacteroidetes, and Actinobacteria were dominant in D. antarctica, while Actinobacteria dominated C. quitensis.
  • High heterogeneity at the amplicon sequence variant (ASV) level was observed, linked to microscale soil surface temperature variations (UTII index).
  • Predicted functions included lignin degradation, suggesting a role in primary soil development.

Conclusions:

  • Antarctic plant rhizospheres harbor distinct microbial communities influenced by temperature.
  • These microbiomes are potentially crucial for soil development and support the growth of native Antarctic vascular plants.
  • Experimental validation is recommended to confirm the predicted functional roles of these microbial communities.