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CONTRASTING STOMATAL RESPONSES TO VARIABLE SUNLIGHT IN TWO SUBALPINE HERBS.

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Subalpine herbs show varied responses to fluctuating sunlight. Water stress significantly impacts stomatal conductance in Helianthella quinquenervis, reducing gas exchange during shade, while Frasera speciosa remains less affected.

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Area of Science:

  • Plant physiology
  • Ecology
  • Environmental science

Background:

  • Plants acclimate to changing light conditions through physiological adjustments.
  • Stomatal conductance (g) regulates gas exchange and is sensitive to environmental factors like light and water availability.
  • Non-steady-state gas exchange responses to fluctuating photosynthetic photon flux density (PPFD) can be influenced by water stress.

Purpose of the Study:

  • To investigate the gas exchange responses of two subalpine herbs, Helianthella quinquenervis and Frasera speciosa, to simulated natural cloud patterns (alternating sun and shade).
  • To determine the influence of seasonal water stress on these gas exchange responses.
  • To test the hypothesis that water stress affects non-steady-state gas exchange responses to PPFD fluctuations.

Main Methods:

  • Gas exchange measurements, including stomatal conductance (g) and net photosynthesis, were conducted on H. quinquenervis and F. speciosa.
  • Plants were subjected to alternating periods of sun and shade simulating natural cloud patterns.
  • Measurements were taken across a range of PPFD levels and as seasonal water stress increased, with comparisons to irrigated plants.

Main Results:

  • H. quinquenervis exhibited significant reductions in g (up to 75%) during shade periods, particularly when experiencing water stress later in the season.
  • F. speciosa showed minimal changes in g in response to light fluctuations, irrespective of water stress, likely due to slower stomatal responses.
  • Early in the season or in well-watered plants, H. quinquenervis showed little reduction in g during shade, but this response intensified with increasing water stress.

Conclusions:

  • The seasonal adjustment in stomatal response to shade in H. quinquenervis allows for maximized carbon gain when water is abundant and water conservation during drought.
  • F. speciosa exhibits a more consistent, less responsive stomatal behavior to light fluctuations, regardless of water status.
  • Understanding these differential responses is crucial for predicting subalpine herb survival and carbon dynamics under variable environmental conditions.