Taxonomical and functional microbial community selection in soybean rhizosphere

In order to filter the data for reduced network complexity, we considered high correlations with cutoff at r 40.7 and statistically significant P-value o0.01 and o0.001 for taxonomy and function, respectively, taking into account all replicates

Lucas W Mendes; Eiko E Kuramae; Acácio A Navarrete; Johannes A van Veen; Siu M Tsai

2014

Scholarcy highlights

  • Within the soil system, the immediate surroundings of the plant root, that is, rhizosphere, is a microbial hot spot considered to be one of the most dynamic interfaces on earth
  • The neutral theory predicts that the structure and composition of species communities is related to the geographic distance between samples as a result of dispersal limitation, as many species are functionally equivalent in their ability to exploit niches
  • The niche-based theory predicts that changes in species community composition are related to changes in environmental variables, as species have unique properties that allow them to exploit unique niches available. Their species abundances will follow pre-emption, broken stick, log-normal and Zipf– Mandelbrot models. Both theories are well connected with environmental factors, but neither suggest how the microbial community assembly in Southeastern Brazilian Amazon, in the state of Mato the main hot spot of life in soil, that is, the Grosso, Brazil, in the municipalities of Ipiranga do rhizosphere, is driven
  • The ordination of the taxonomic profiles revealed a clear separation between bulk soil and rhizosphere samples, which indicates a selective change in the bacterial community structure in the rhizosphere as compared with the composition of the bulk soil community as has been shown by others
  • A network analysis was accomplished in order to gain a more integrated understanding of the microbial community composition and functional traits and to compare the complexity of networks operating in the bulk soil and the rhizosphere
  • Our results suggest that soybean selects a specific microbial community inhabiting the rhizosphere based on functional traits, which may be related to benefits to the plant, as growth promotion and nutrition
  • Further analysis are needed to better understand the mechanisms by which the plant selects the rhizospheric community, whereby the study of the role of rhizodeposits in shaping microbial communities is of prime importance

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