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Related Experiment Video

Updated: May 9, 2025

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Plant nickel-exclusion versus hyperaccumulation: a microbial perspective.

Julie Dijoux1, Sarah Gigante2, Gael Lecellier2

  • 1Institute of Exact and Applied Sciences, University of New Caledonia, 145 Avenue James Cook, Noumea, New Caledonia, BP R4, 98851. juu.dijoux@gmail.com.

Microbiome
|May 4, 2025
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Summary
This summary is machine-generated.

Microbial communities in metallophytes differ based on metal hyperaccumulation or exclusion. This study reveals distinct microbial biomarkers in nickel-hyperaccumulating and non-accumulating Psychotria species, essential for understanding plant adaptation to heavy metals.

Keywords:
Psychotria sp.BacteriaFungiHyperaccumulationMetabarcodingMetallophytesMicrobiotaNickelUltramafic Substrates

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Area of Science:

  • Plant and Microbial Ecology
  • Environmental Science
  • Genomics

Background:

  • New Caledonia's ultramafic soils host unique metallophytes adapted to heavy metals.
  • These plants interact with specialized microorganisms that aid in nutrient acquisition and stress tolerance.
  • Plant-microbiota interactions are crucial for plant adaptation to harsh, metal-rich environments.

Purpose of the Study:

  • To investigate if microbial associations within plant compartments correlate with metal hyperaccumulation or exclusion phenotypes.
  • To compare the microbiomes of two sympatric Psychotria species with differing nickel responses.

Main Methods:

  • Systematic comparative metabarcoding of fungal and bacterial communities.
  • Analysis of aboveground and underground compartments of two Psychotria species (nickel-hyperaccumulator and non-accumulator).

Main Results:

  • Fungal communities were structured by both plant phenotype and compartment.
  • Bacterial communities were primarily shaped by belowground compartments, with lower diversity in aboveground tissues.
  • Distinct microbial signatures (biomarkers) were identified for each plant species and compartment.

Conclusions:

  • This is the first study to systematically compare metallophyte microbiomes across compartments and phenotypes in New Caledonia.
  • Distinct microbial biomarkers differentiate nickel-hyperaccumulating from non-accumulating Psychotria species.
  • Identified biomarkers may enhance phytoextraction and phytostabilization, highlighting the importance of microbial roles in plant metal adaptation.