Verrucomicrobial community structure and abundance as indicators for changes in chemical factors linked to soil fertility

  • Navarrete A
  • Soares T
  • Rossetto R
 et al. 
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Abstract

Here we show that verrucomicrobial community structure and abundance are
extremely sensitive to changes in chemical factors linked to soil
fertility. Terminal restriction fragment length polymorphism fingerprint
and real-time quantitative PCR assay were used to analyze changes in
verrucomicrobial communities associated with contrasting soil nutrient
conditions in tropical regions. In case study Model I
({''}Slash-and-burn deforestation{''}) the verrucomicrobial community
structures revealed disparate patterns in nutrient-enriched soils after
slash-and-burn deforestation and natural nutrient-poor soils under an
adjacent primary forest in the Amazonia (R = 0.819, P = 0.002). The
relative proportion of Verrucomicrobia declined in response to increased
soil fertility after slash-and-burn deforestation, accounting on
average, for 4 and 2 % of the total bacterial signal, in natural
nutrient-poor forest soils and nutrient-enriched deforested soils,
respectively. In case study Model II ({''}Management practices for
sugarcane{''}) disparate patterns were revealed in sugarcane rhizosphere
sampled on optimal and deficient soil fertility for sugarcane (R =
0.786, P = 0.002). Verrucomicrobial community abundance in sugarcane
rhizosphere was negatively correlated with soil fertility, accounting
for 2 and 5 % of the total bacterial signal, under optimal and
deficient soil fertility conditions for sugarcane, respectively. In
nutrient-enriched soils, verrucomicrobial community structures were
related to soil factors linked to soil fertility, such as total
nitrogen, phosphorus, potassium and sum of bases, i.e., the sum of
calcium, magnesium and potassium contents. We conclude that community
structure and abundance represent important ecological aspects in soil
verrucomicrobial communities for tracking the changes in chemical
factors linked to soil fertility under tropical environmental
conditions.

Author-supplied keywords

  • Bioindicators
  • Land-use changes
  • Slash-and-burn
  • Sugarcane
  • Tropical soils

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