Journal
JOURNAL OF PHYCOLOGY
Volume 47, Issue 6, Pages 1266-1273Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1529-8817.2011.01060.x
Keywords
diatoxanthin; FCP; photosystem II; thylakoids; xanthophyll cycle
Categories
Funding
- DFG [DFG Bu 812/4-1]
Ask authors/readers for more resources
The diatom Cyclotella meneghiniana Katz. (SAG 1020-a) was cultured under high-light (HL) and low-light (LL) conditions with either high (12 mu M) or low (1 mu M) iron in the media. Changes in cell morphology, especially cell volume and chloroplast size, were observed in cells grown under low iron. In contrast, HL had a much stronger influence on the photosynthetic apparatus. PSII function was unimpaired under lowered iron supply, but its quantum efficiency and reoxidation rate were reduced under HL conditions. As reported before, HL induced changes in antenna polypeptide composition. Especially the amount of Fcp6, an antenna protein related to LI818 and known to be involved in photoprotection, was increased under HL but was significantly reduced under lowered iron. The diatoxanthin content correlated with the amount of Fcp6 in isolated FCPa antenna complexes and was thus increased under HL and reduced under low iron as well. While the diatoxanthin (Dt) content of whole cells was enhanced under HL, no decrease was observed under lowered iron supply, ruling out the possibility that the decreased amounts in FCPa were due to a hampered diadinoxanthin de-epoxidase activity under these conditions. Thus, diatoxanthin not bound to FCPa has to be responsible for protection under the slight reduction in iron supply used here.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available