Journal
PHOTOSYNTHESIS RESEARCH
Volume 117, Issue 1-3, Pages 31-44Publisher
SPRINGER
DOI: 10.1007/s11120-013-9849-7
Keywords
D1 protein; Oxygen-evolving complex; Photochemical efficiency; Photoprotection; Photosystem II; Source-sink balance
Categories
Funding
- National Science Foundation [IOS-0841546, DEB-1022236]
- University of Colorado at Boulder
- Division Of Environmental Biology
- Direct For Biological Sciences [1022236] Funding Source: National Science Foundation
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Photoinhibition in leaves in response to high and/or excess light, consisting of a decrease in photosynthesis and/or photosynthetic efficiency, is frequently equated to photodamage and often invoked as being responsible for decreased plant growth and productivity. However, a review of the literature reveals that photoinhibited leaves characterized for foliar carbohydrate levels were invariably found to possess high levels of sugars and starch. We propose that photoinhibition should be placed in the context of whole-plant source-sink regulation of photosynthesis. Photoinhibition may represent downregulation of the photosynthetic apparatus in response to excess light when (1) more sugar is produced in leaves than can be utilized by the rest of the plant and/or (2) more light energy is harvested than can be utilized by the chloroplast for the fixation of carbon dioxide into sugars.
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