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Ecologically driven selection of nonstructural carbohydrate storage in oak trees.

Morgan E Furze1, Dylan K Wainwright2, Brett A Huggett3

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Deciduous oak species evolve higher nonstructural carbohydrate (NSC) concentrations, particularly starch in stems, compared to evergreen relatives. This suggests a deciduous leaf habit aids resilience to environmental stress.

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Quercusleaf habitnonstructural carbohydrate (NSC)phylogenetic comparative methodstrees

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Area of Science:

  • Plant Biology
  • Evolutionary Biology
  • Ecology

Background:

  • Leaf habit significantly impacts plant diversity and carbon balance, as leaves are central to photosynthesis.
  • Nonstructural carbohydrates (NSCs) are crucial for plant energy storage and stress resilience.
  • The evolutionary relationship between leaf habit and NSC storage remains underexplored.

Purpose of the Study:

  • To investigate if leaf habit explains variations in NSC storage across oak species.
  • To analyze the evolutionary drivers of NSC storage in relation to leaf habit.

Main Methods:

  • Comparative physiological analysis of 51 oak species (Quercus spp.) in a common garden.
  • Measurement of sugar and starch concentrations in different leaf habits (deciduous, brevideciduous, evergreen).
  • Evolutionary model fitting to determine trait evolution patterns.

Main Results:

  • Deciduous oak species show significantly higher NSC concentrations than brevideciduous and evergreen species.
  • Elevated starch concentrations, a key storage molecule, were observed in the stems of deciduous oaks.
  • Evolutionary models supported leaf habit as a significant factor influencing NSC storage.

Conclusions:

  • Leaf habit is a key evolutionary driver of nonstructural carbohydrate storage strategies in oaks.
  • A deciduous strategy may provide an adaptive advantage against environmental stressors.
  • Findings offer insights into plant adaptation mechanisms in a changing global environment.