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Photoprotection and Other Responses of Plants to High Light Stress

Photoprotection and Other Responses of Plants to High Light Stress This review deals with the responses of the photosynthetic organs of plants to high light, with an emphasis on a recently recognized mechanism that protects 0066-4294/92/0601-0599$02.00 DEMMIG-ADAMS & ADAMS the photosynthetic apparatus against damage under conditions frequently encountered by plants. As Powles (123) did before us, we restrict our discussion to light absorbed by chlorophyll-Leo visible light. Light stress results not from high light per se, but rather from an excess of absorbed light beyond that utilized in photosynthesis. An excess of light can arise when the ratio of photon flux density (PFD) to photosynthesis is high. This ratio can increase through increases in PFD or through decreases in photosynthesis at a constant PFD, such as might occur under chilling conditions or in response to water stress. Plants exhibit an entire spectrum of responses to increasing PFD (Figure I). Over a range of PFDs, an increase in the absorption of light by chlorophyll will result in an increase in photosynthetic CO2 fixation. Above a certain PFD, however, photosynthesis will be incapable of utilizing all the energy absorbed by chlorophyll. In this range of PFDs various mechanisms operate that protect the photosynthetic apparatus against damage from the accumula­ tion http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Photoprotection and Other Responses of Plants to High Light Stress

Demmig-Adams, B; Adams, W W
Annual Review of Plant Biology , Volume 43 (1) – Jun 1, 1992
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References (30)

Publisher
Annual Reviews
Copyright
Copyright 1992 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
DOI
10.1146/annurev.pp.43.060192.003123
Publisher site
See Article on Publisher Site

Abstract

This review deals with the responses of the photosynthetic organs of plants to high light, with an emphasis on a recently recognized mechanism that protects 0066-4294/92/0601-0599$02.00 DEMMIG-ADAMS & ADAMS the photosynthetic apparatus against damage under conditions frequently encountered by plants. As Powles (123) did before us, we restrict our discussion to light absorbed by chlorophyll-Leo visible light. Light stress results not from high light per se, but rather from an excess of absorbed light beyond that utilized in photosynthesis. An excess of light can arise when the ratio of photon flux density (PFD) to photosynthesis is high. This ratio can increase through increases in PFD or through decreases in photosynthesis at a constant PFD, such as might occur under chilling conditions or in response to water stress. Plants exhibit an entire spectrum of responses to increasing PFD (Figure I). Over a range of PFDs, an increase in the absorption of light by chlorophyll will result in an increase in photosynthetic CO2 fixation. Above a certain PFD, however, photosynthesis will be incapable of utilizing all the energy absorbed by chlorophyll. In this range of PFDs various mechanisms operate that protect the photosynthetic apparatus against damage from the accumula­ tion

Journal

Annual Review of Plant Biology – Annual Reviews

Published: Jun 1, 1992

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