OOGONIA OF MACROALGA UNDARIA PINNATIFIDA ARE ALKALINE-PHOSPHATASE POSITIVE AND CONTAIN GERMINAL BODY-LIKE STRUCTURES

It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The oogonia exhibited a higher level of APA than in its initials. Electron...

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Bibliographic Details
Published in:Journal of phycology 2008-06, Vol.44 (3), p.712-715
Main Authors: Alexandrova, Ya N, Reunov, A.A
Format: Article
Language:English
Subjects:
alkaline-phosphatase activity
germinal body-like structures
Laminariales
Metazoa
Phaeophycophyta
Phaeophyta
ultrastructure
Undaria
Undaria pinnatifida
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Summary:It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The oogonia exhibited a higher level of APA than in its initials. Electron-dense granular ovoid structures ~0.5-0.6 μm were present in the cytoplasm of oogonia. These inclusions were not membrane bound and do not appear to be associated with any particular organelles. The number of the inclusions was 1 to 2 in a single section of the cell. In essential details, the specific APA and subcellular germinal body-like structure of the developing female gamete in U. pinnatifida were very similar to those in metazoan oocytes.
ISSN:0022-3646
1529-8817
DOI:10.1111/j.1529-8817.2008.00514.x