Effect of light quality on chloroplast-membrane organization and function in pea |
| |
Authors: | R. E. Glick S. W. McCauley A. Melis |
| |
Affiliation: | (1) Division of Molecular Plant Biology, University of California, 313 Hilgard Hall, 94720 Berkeley, CA, USA |
| |
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.Abbreviations and symbols 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 - P700 primary electron donor of PSI - PSI, PSII photosystems I and II, respectively - Q primary electron acceptor of PSII |
| |
Keywords: | Chlorophyll protein Light and chloroplast structure Photosynthesis (electron transport, reaction center Pisum (chloroplasts) Thylakoid organization |
本文献已被 SpringerLink 等数据库收录! |
|