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Phenotypic plasticity and growth temperature: understanding interspecific variability.

O K Atkin1, B R Loveys, L J Atkinson

  • 1Department of Biology, University of York, PO Box 373, York YO1 5YW, UK. OKA1@york.ac.uk

Journal of Experimental Botany
|December 24, 2005
PubMed
Summary

Long-term temperature changes impact plant growth by altering metabolic acclimation and trait plasticity. Understanding these shifts in net assimilation rates (NAR) and specific leaf area (SLA) is crucial for predicting plant responses to climate change.

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Area of Science:

  • Plant Physiology
  • Ecology
  • Climate Change Biology

Background:

  • Plant growth is significantly influenced by long-term temperature fluctuations.
  • Thermal acclimation of plant metabolism is closely tied to biochemical and morphological trait plasticity.

Purpose of the Study:

  • To review the impact of long-term temperature changes on plant growth and its components.
  • To explore the relationship between thermal acclimation, trait plasticity, and plant responses to varying temperatures.

Main Methods:

  • Review of existing literature on plant growth, temperature effects, and trait plasticity.
  • Analysis of trade-offs between net assimilation rates (NAR) and biomass allocation (SLA).
  • Examination of the roles of photosynthesis and respiration in determining NAR.

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Main Results:

  • Fast-growing species show greater temperature-dependent changes in RGR, SLA, and NAR compared to slow-growing species.
  • Species from favorable habitats exhibit greater temperature-mediated changes in RGR and NAR, but not consistently in SLA.
  • Biomass allocation (leaf-to-root ratio) is more plastic in slow-growing species under contrasting temperatures.

Conclusions:

  • Interspecific variation in NAR explains more RGR variability at lower temperatures, while SLA dominates at higher temperatures.
  • The importance of SLA in determining RGR variability may increase with rising global temperatures.
  • Plant trait plasticity is a key factor in adapting to changing thermal environments.