Abstract
The thylakoids of two cryptomonads,Chroomonas sp. andCryptomonas sp., were examined in thin sections and freeze-fracture preparations. The thylakoids of both species were organized into stacks of typically 2 thylakoids, with regions of adhesion evident between adjacent membranes. The stacked membranes had a higher EF particle density (EFs face) than unstacked membranes (EFu face). However, no differences in size between EFs and EFu particles was observed; both faces had 15 nm particles. Two types of PF faces were observed in stacked membranes, a PFs face and a PFs1 face. The PFs1 face was identical to the PFu face. These results suggest that there is partial segregation of photosystem II into stacked membranes and photosystem I into unstacked membranes. However, the extent to which segregation occurred varied between the two species, as indeed did other aspects of thylakoid organization.
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