Regulation of Photosynthetic Carbon Metabolism in Water-Stressed Sunflower

  • D. W. Lawlor
  • Carmen Gimenez
  • D. A. Ward
  • A. T. Young
Part of the NATO ASI Series book series (NSSA, volume 168)


Water stress limits plant production in many parts of the world. When leaf mesophyll cells lose water and turgor their capacity for photosynthesis declines1,2 and the rate of photosynthesis per unit leaf area decreases. This is not caused by stomatal closure only, but by inhibition of metabolism1,2,3. The mechanisms by which cell water deficit affects metabolism and slows CO2 assimilation are not well understood4,5. Light harvesting and electron transport in thylakoid membranes are less sensitive to water stress than is photophosphorylation4,5,6, which takes place in the chloroplast stroma and may be affected by increased concentrations of stromal components. Without an understanding of the effects of water stress on the mechanisms of photosynthesis, selection of plants with characteristics better adapted to drought will be hindered, as will direct manipulation of the photosynthetic system.


Water Stress Mesophyll Cell Leaf Water Potential Total Soluble Protein Energy Charge 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • D. W. Lawlor
    • 1
  • Carmen Gimenez
    • 2
  • D. A. Ward
    • 1
  • A. T. Young
    • 1
  1. 1.AFRC Institute of Arable Crops ResearchRothamsted Experimental Station HarpendenHerts.UK
  2. 2.Department of AgronomyETSIACordobaSpain

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