Relationships among cell chlorophyll content, photosystem II light-harvesting and the quantum yield for oxygen production inChlorella
✍ Scribed by Arthur C. Ley
- Book ID
- 104627908
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 403 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0166-8595
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✦ Synopsis
Cells of the green alga Chlorella vul~arls were grown under conditions where total Chl/cell varied by a factor of almost 80; from 0.02 fmol/cell to nearly 1.6 fmol/cell. The change in Chl/cell was accomplished by an approximately ll-fold increase in RCII/cell along with a 7-fold increase in Chl/RCII. The effective absorption cross section per RCII at 596 nm varied by a factor of 6, increasing with Chl/cell from a minimum of 20 A 2 to a maximum of 116 A 2. In contrast, over the same range of Chl/cell, the quantum requirement for 02 production remained relatively constant at I0.4~ 1.8 quanta absorbed/O 2 evolved. The results are well described by a simple model in which changes in Chl/cell are produced by coordinated changes in reaction center and llght-harvesting complexes. The model predicts that between 20 and 40% of the light-harvesting chlorophyll-protein complexes commonly assigned to PSII, do not function as antenna for PSII.