Contrasting Microbial Taxonomic and Functional Colonisation Patterns in Wild Populations of the Pan-Palaeotropical C4 Grass, Themeda triandra.

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Riley J Hodgson, Christian Cando-Dumancela, Tarryn Davies, Elizabeth A Dinsdale, Michael P Doane, Robert A Edwards, Craig Liddicoat, Shawn D Peddle, Sunita A Ramesh, Jake M Robinson, Martin F Breed
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引用次数: 0

Abstract

The interactions between native plants and soil microbiota are not well characterised, despite growing recognition of their importance for host plant fitness and ecological functioning. We used shotgun metagenomics to examine microbial taxonomic and functional colonisation patterns in wild populations of the pan-palaeotropical C4 grass, Themeda triandra, across a globally representative aridity gradient (aridity index 0.318-0.903). We investigated these patterns through the two-step selection process whereby microbes are recruited from bulk soils into rhizospheres (soil on the root surface), and root interiors (endospheres). We provide clear evidence of this process through decreasing microbial taxonomic diversity from bulk soil to T. triandra roots. Surprisingly, microbial functional potential showed the opposite trend: the diversity of potential functions (exponent of Shannon's diversity) increased from bulk soil to the rhizosphere and endosphere, but functional richness did not. Finally, we found that increasing aridity was associated with rhizospheres that were more compositionally similar, yet remained highly diverse in functional potential. Overall, aridity is strongly associated with the root-associated microbiome of T. triandra, selecting for microbiota that likely support plant resilience under dry conditions. Furthermore, microbial functional potential closely tracks taxonomic composition and aridity trends, highlighting how native plants can shape their microbial communities.

泛古热带C4禾草野生种群微生物分类和功能定植模式对比
原生植物与土壤微生物群之间的相互作用尚未得到很好的表征,尽管人们越来越认识到它们对寄主植物适应性和生态功能的重要性。研究人员利用散弹枪宏基因组学方法,在具有全球代表性的干旱梯度(干旱指数0.318-0.903)上,研究了泛古热带C4草(Themeda triandra)野生种群的微生物分类和功能定植模式。我们通过两步选择过程研究了这些模式,即微生物从散装土壤中招募到根际(根表面的土壤)和根内部(根内球)。我们通过从块状土壤到三叶草根的微生物分类多样性的减少,提供了这一过程的明确证据。令人惊讶的是,微生物功能势呈现相反的趋势,从散装土到根际和内圈,势功能多样性(Shannon’s多样性指数)呈增加趋势,但功能丰富度没有增加。最后,我们发现干旱的增加与根际的成分更相似,但在功能潜力上仍然高度多样化有关。总的来说,干旱与三头草根相关的微生物群密切相关,选择可能支持植物在干燥条件下恢复力的微生物群。此外,微生物功能潜力密切跟踪分类组成和干旱趋势,突出了原生植物如何塑造其微生物群落。
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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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