By M. Levendowsky (Eds.)
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Additional info for Biochemistry and Physiology of Protozoa
He published, for the first time, details of the "cryptonucleus" (later called "nucleomorph") found in the periplastidial compartment of these organisms. He also pointed out that, although starch was present in the cytoplasm of the rhodophytes and dinoflagellates and in the, periplastidial compartment of the Cryptophyceae, it was not found at all in the chrysophyte groups (Chromophyta). Consequently it was suggested that cryptophytes could have retained a primitive condition which had been lost, together with the nucleomorph, during evolution along the chrysophyte line.
There are also some dinoflagel- 2. The Phytoflagellates: Fine Structure and Phylogeny 31 lates of the genus Gymnodinium, which have chloroplasts with internal pyrenoids and fucoxanthin pigment but no girdle lamella and no second nucleus in the cell (Dodge, 1975b). One study has been made of circadian changes in the structure of the chloroplasts ofGonyaulax polyedra (Herman and Sweeney, 1975). Here, it was found that the spacing between the lamellae in the parts of the chloroplasts near the centre of the cell was wider during the day than at night.
A quite distinctive type of chloroplast is found in Glenodinium foliaceum (Dodge, 1975b; Jeffrey and Vesk, 1976) and P. balticum (Tomas and Cox, 1973). Here there is a distinct girdle lamella, there are connections between adjacent lamellae, and an internal pyrenoid is present. These two species contain the carotenoid pigment fucoxanthin and have a supernumerary nucleus in addition to the typical mesokaryotic type. As the chloroplasts and extra nucleus appear to be completely enclosed by a single-membrane envelope, it has been suggested that they represent a symbiont from the Chrysophyceae (Tomas and Cox, 1973).
Biochemistry and Physiology of Protozoa by M. Levendowsky (Eds.)