Photosynthetica 1998, 35(4):611-619 | DOI: 10.1023/A:1006995410998
Analysis of Photosynthetic Responses and Adaptation to Nitrogen Starvation in Chlorella Using In Vivo Chlorophyll Fluorescence
- 1 Department of Botany, Faculty of Science, University of Minia, El-Minia, Egypt
Nitrogen (N) starvation resulted in degreening, inhibition of photosynthetic oxygen evolution and dark respiration, reduced survival, and increased age-specific mortality in both Chlorella fusca and Chlorella vulgaris. Analysis of in vivo chlorophyll (Chl) fluorescence induction kinetics revealed the presence of N-starvation-induced changes at the level of degreened thylakoids in both species. These changes included decreased yield of the photochemistry of photosystem 2 (PS2), and a declined photosynthetic efficiency. Synthesis of secondary carotenoids represented a biochemical change in carotenogenesis that had a photoprotective effect in degreened C. fusca. This inferred photoprotection was reflected in the delayed inhibition of oxygen evolution and improved survival of C. fusca under N-starvation. The effect was further elucidated by comparison with C. vulgaris which was not able to synthesize secondary carotenoids under the same conditions.
Additional key words: carotenoids; oxygen evolution; photosystem 2; species differences; respiration
Prepublished online: December 1, 1998; Published: January 1, 1998 Show citation
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