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A Simple Protocol for Mapping the Plant Root System Architecture Traits
Published on: February 10, 2023
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Evolutionary history and root trait coordination predict nutrient strategy in tropical legume trees
Mia Marcellus1, Ellie M Goud2, Natalie Swartz1
1Department of Biology, McGill University, Montreal, QC, H3A 1B1, Canada.
The New Phytologist
|July 15, 2024
Summary
Phylogeny influences plant nutrient traits, even in closely related species. Nitrogen-fixing trees may trade nitrogen for enhanced phosphorus acquisition, highlighting the importance of evolutionary history in plant functional trait studies.
Area of Science:
- Plant Ecology
- Evolutionary Biology
- Biogeochemistry
Background:
- Plant nutrient use and acquisition traits vary widely.
- The influence of phylogeny on trait combinations is not fully understood.
- Nitrogen (N) fixation is a key trait used in plant functional groups, but phylogeny may confound these classifications.
Purpose of the Study:
- To investigate how phylogeny, trait coordination, and resource investment trade-offs shape nutrient traits in tropical Fabaceae trees.
- To examine the relationship between nitrogen (N) fixation and other traits, particularly phosphorus acquisition strategies.
- To determine the role of evolutionary history in trait variation within and between functional groups.
Main Methods:
- Quantified growth, carbon metabolism, N-fixation rate, root phosphatase activity (RPA), mycorrhizal colonization, and leaf/root morphology/chemistry in 22 tropical Fabaceae species.
- Analyzed trait variation and correlations, accounting for phylogenetic nonindependence.
- Compared fixing and nonfixing species under common conditions.
Main Results:
- High belowground trait variation observed, even among related species.
- Most traits, including N-fixation rate and nodule biomass, showed a significant phylogenetic signal.
- Strong positive correlations between physiological traits (e.g., RPA and root respiration) were found.
- RPA increased significantly with N-fixation rate, supporting a nitrogen-for-phosphorus trade-off hypothesis.
- Differences in specific root length and root N between functional groups were significant, but other trait differences diminished after controlling for phylogeny.
Conclusions:
- Evolutionary history (phylogeny), trait coordination, and N-fixation ability collectively shape plant nutrient traits at the species level.
- Phylogenetic nonindependence must be explicitly considered when analyzing plant functional groups and trait relationships.
- The findings challenge simple functional classifications and emphasize the complex interplay of factors driving trait diversity.
Keywords:
Fabaceaebelowground traitsmycorrhizasnitrogen fixationnutrient tradingphosphatase enzymesphylogenyroot economicsMore Related Videos
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