Abstract
The effect of light quality during plant growth of chloroplast membrane organization and function in peas (Pisum sativum L. cv. Alaska) was investigated. In plants grown under photosystem (PS) I-enriched (far-red enriched) illumination both the PSII/PSI stoichiometry and the electrontransport capacity ratios were high, about 1.9. In plants grown under PSII-enriched (far-red depleted) illumination both the PSII/PSI stoichiometry and the electron-transport capacity ratios were significantly lower, about 1.3. In agreement, steady-state electron-transport measurements under synchronous illumination of PSII and PSI demonstrated an excess of PSII in plants grown under far-red-enriched light. Sodium dodecylsulfate polyacrylamide gel electrophoretic analysis of chlorophyll-containing complexes showed greater relative amounts of the PSII reaction center chlorophyll-protein complex in plants grown under farred-enriched light. Additional changes were observed in the ratio of light-harvesting chlorophyll a/b protein to PSII reaction center chlorophyll-protein under the two different light-quality regimes. The results demonstrate the dynamic nature of chloroplast structure and support the notion that light quality is an important factor in the regulation of chloroplast membrane organization and-function.
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Abbreviations
- Chl:
-
chlorophyll
- CPa:
-
PSII reaction center chlorophyll protein complex
- CPI:
-
PSI chlorophyll protein complex
- FR-D:
-
light depleted in far-red sensitizing primarily PSII
- FR-E:
-
light enriched in far-red sensitizing primarily PSI
- LHCP:
-
PSII light-harvesting chlorophyll a/b protein complex
- P 700 :
-
primary electron donor of PSI
- PSI, PSII:
-
photosystems I and II, respectively
- Q :
-
primary electron acceptor of PSII
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Glick, R.E., McCauley, S.W. & Melis, A. Effect of light quality on chloroplast-membrane organization and function in pea. Planta 164, 487–494 (1985). https://doi.org/10.1007/BF00395964
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DOI: https://doi.org/10.1007/BF00395964