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COMPARATIVE STUDIES ON THE BEHAVIOR OF ALLOGAMOUS PENNATE DIATOMS IN AUXOSPORE FORMATION
Author(s) -
Geitler Lothar
Publication year - 1969
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1969.tb09719.x
Subject(s) - biology , gamete , botany , evolutionary biology , mating type , navicula , diatom , genetics , sperm , gene
Auxospore formation by allogamy in pennate diatoms has been known for a long time, but more recently many kinds of peculiar behavior have come to light. An example of these is the amazing and quite unexpected relationships existing between the alternative site of epi‐ and hypotheca and the establishment of plasmatic gradients in the cell on the one hand and the determination of mating types on the other. Furthermore, there are remarkable specific relations between the formation of copulation‐tubes (or canals) and the mode of pairing, as well as the kind of gamete fusion. There are, too, specific relationships between the mode of gamete fusion and the position of the polar axes in the auxospores and the primary cells. Although there are great variations, one can determine certain types and rules of behavior in pairing and auxospore formation. On the other hand there are certain events, e.g., a “spontaneous plasmolysis” in the auxospores of some races of Navicula cryptocephala , by which the abnormal shape of the primary cell—otherwise inevitable—is avoided.