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SEASONAL PATTERNS OF LEAF PHOTOSYNTHETIC CAPACITY IN SUCCESSIONAL NORTHERN HARDWOOD TREE SPECIES.

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Herbivore-induced Blueberry Volatiles and Intra-plant Signaling
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Leaf dynamics and profitability in wild strawberries.

Thomas W Jurik1, Brian F Chabot1

  • 1Section of Ecology and Systematics, Cornell University, 14853, Ithaca, NY, USA.

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|March 18, 2017
PubMed
Summary

Wild strawberry leaf dynamics reveal that longer-lived leaves, especially in high-light conditions, maximize carbon gain and overall plant profit. Leaf age and light exposure significantly impact photosynthetic efficiency and resource allocation.

Area of Science:

  • Plant Ecology
  • Photosynthesis Research
  • Carbon Cycling

Background:

  • Understanding leaf dynamics is crucial for predicting plant carbon gain and survival.
  • Wild strawberry species (Fragaria virginiana and F. vesca) offer insights into adaptation to varying light environments.
  • Successional regrowth sites provide natural gradients to study environmental influences on plant physiology.

Purpose of the Study:

  • To evaluate leaf dynamics and carbon gain in two wild strawberry species across successional gradients.
  • To model plant growth and CO2 exchange to estimate carbon balances under different environmental conditions.
  • To determine the impact of leaf age, light, water stress, and temperature on leaf carbon gain.

Main Methods:

  • Field studies of leaf biomass dynamics over two to three years in five wild strawberry populations.

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  • Utilized a computer-based model integrating field data with gas exchange rates for carbon balance estimation.
  • Analyzed leaf area, lifespan, and Specific Leaf Weight (SLW) in relation to leaf production time and light availability.

    • Main Results:

    • Leaves produced throughout the growing season, with highest area and lifespan for late spring leaves.
    • Specific Leaf Weight (SLW) varied among populations and increased with light exposure; F. vesca had longer-lived leaves.
    • Leaf age significantly affected carbon gain in high-light environments; light was the primary factor in low-light conditions.

    Conclusions:

    • Leaves in high-light environments exhibited greater lifetime carbon profit and higher profit-to-cost ratios.
    • Increasing leaf lifespan substantially boosted carbon profit, particularly for low-light leaves.
    • Optimizing leaf longevity and photosynthetic potential in high-light conditions is key for maximizing wild strawberry carbon gain.