Journal
PHOTOSYNTHESIS RESEARCH
Volume 63, Issue 1, Pages 97-107Publisher
SPRINGER
DOI: 10.1023/A:1006303611365
Keywords
Arabidopsis thaliana (L.) Heynh.; cytochrome f; Digitalis purpurea L.; light flecks; oxygen evolution; photosynthetic acclimation; Rubisco; Silene dioica (L.) Clairv.; sunflecks
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This paper describes a study into the potential of plants to acclimate to light environments that fluctuate over time periods between 15 min and 3 h. Plants of Arabidopsis thaliana (L.) Heynh., Digitalis purpurea L. and Silene dioica (L.) Clairv. were grown at an irradiance 100 mu mol m(-)2 s(-)1. After 4-6 weeks, they were transferred to light regimes that fluctuated between 100 and either 475 or 810 mu mol m(-)2 s(-)1, in a regular cycle, for 7 days. Plants were shown, in most cases, to be able to undergo photosynthetic acclimation under such conditions, increasing maximum photosynthetic rate. The extent of acclimation varied between species. A more detailed study with S. dioica showed that this acclimation involved changes in both Rubisco protein and cytochrome f content, with only marginal changes in pigment content and composition. Acclimation to fluctuating light, at the protein level, did not fully reflect the acclimation to continuous high light - Rubisco protein increased more than would be expected from the mean irradiance, but less than expected from the high irradiance; cytochrome f increased when neither the mean nor the high irradiance would be expected to induce an increase.
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