reviewAnnals of BotanyJan 19, 2009HYBRID OA

Causes of decreased photosynthetic rate and metabolic capacity in water-deficient leaf cells: a critical evaluation of mechanisms and integration of processes

DWDavid W. LawlorWTWilmer Tezara

Rothamsted Research · Central University of Venezuela

PubMed
Indexed incrossrefpubmed

Abstract

BACKGROUND: Water deficit (WD) decreases photosynthetic rate (A) via decreased stomatal conductance to CO(2) (g(s)) and photosynthetic metabolic potential (A(pot)). The relative importance of g(s) and A(pot), and how they are affected by WD, are reviewed with respect to light intensity and to experimental approaches. SCOPE AND CONCLUSIONS: With progressive WD, A decreases as g(s) falls. Under low light during growth and WD, A is stimulated by elevated CO(2), showing that metabolism (A(pot)) is not impaired, but at high light A is not stimulated, showing inhibition. At a given intercellular CO(2) concentration (C(i)) A decreases, showing impaired metabolism (A(pot)). The C(i) and probably chloroplast CO(2)…

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Topics & keywords

Topics
Keywords
  • Photosynthesis
  • Photorespiration
  • Biology
  • RuBisCO
  • Electron transport chain
  • ATP synthase
  • Biophysics
  • Chloroplast
UN Sustainable Development Goals
  • Clean water and sanitation
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