Photosynthetic acclimation of higher plants to growth in fluctuating light environments |
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Authors: | Yin Zu-Hua Johnson Giles N |
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Institution: | (1) School of Biological Sciences, 3.614 Stopford Building, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK |
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Abstract: | 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 mol m-2 s-1. After 4–6 weeks, they were transferred to light regimes that fluctuated between 100 and either 475 or 810 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.This revised version was published online in October 2005 with corrections to the Cover Date. |
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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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