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Elevated CO2 Effects during Leaf Ontogeny (A New Perspective on Acclimation).

A. Miller1, C. H. Tsai, D. Hemphill

  • 1Department of Botany (A.M., C.-H.T., D.H., M.E., S.R., M.S.), and Interdepartmental Plant Physiology Program (A.M., D.H., S.R., M.S.), Iowa State University, Ames, Iowa 50011.

Plant Physiology
|September 12, 2002
PubMed
Summary
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Elevated carbon dioxide (CO2) reduces plant photosynthesis. In tobacco, high CO2 accelerates leaf development stages, leading to an earlier decline in photosynthetic rates due to altered leaf ontogeny.

Area of Science:

  • Plant physiology
  • Plant biochemistry
  • Photosynthesis research

Background:

  • Elevated CO2 often decreases photosynthetic rates in plants.
  • Leaf ontogeny, the developmental process of leaves, can influence acclimation responses.
  • Understanding these responses is crucial for predicting plant productivity in changing environments.

Purpose of the Study:

  • To investigate the role of leaf ontogeny in the acclimation of photosynthesis to elevated CO2.
  • To compare photosynthetic patterns in tobacco leaves grown under ambient and high CO2 conditions.

Main Methods:

  • Monitoring of photosynthesis and related parameters in tobacco leaves.
  • Short-interval measurements throughout leaf ontogenetic development.
  • Comparison of plants under ambient (350 µL L⁻¹) and high (950 µL L⁻¹) CO2.

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Main Results:

  • Photosynthetic rate patterns were similar in both CO2 treatments but temporally shifted under high CO2.
  • High CO2 exposure led to an earlier maximum photosynthetic rate and a subsequent earlier decline.
  • Ribulose-1,5-biphosphate carboxylase/oxygenase activity was a key regulator of photosynthesis in both conditions.

Conclusions:

  • Lowered photosynthetic rates during acclimation to high CO2 result from a temporal shift in leaf ontogeny.
  • The normal decline in photosynthetic rates associated with senescence begins earlier under elevated CO2.
  • A new model is proposed to explain CO2 acclimation based on altered leaf development timing.