The light‐harvesting complex (LHC) ofGiraudyopsis stelliferDangeard was isolated on a sucrose density gradient after digitonin treatment, and the pigment composition was analyzed by reverse‐phase high‐pressure liquid chromatography. The LHC is a chlorophyll (Chl) a/c/fucoxanthin/violaxanthin complex, depleted of β‐carotene, comparable to the LHC of Fucophyceae. The excitation transfer from Chlcand fucoxanthin to Chlais efficient in whole cells. Immunological reactions indicate a close relationship between Chrysophyceae and Fucophyceae. The immunocytochemical labeling confirms the lack of segregation of the LHC in the appressed membranes of the three associated thylakoids and its localization in the intrapyrenoid thylakoid. The violaxanthin‐antheraxanthin‐zeaxanthin cycle is operative in the cells and efficiently protects photosystem II reaction centers against photoinhibition.
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Lichtlé et al. (1995) studied this question.
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