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Sexual auxosporulation of the marine diatom Navicula directa var. directa
Author(s) -
Mizuno Makoto
Publication year - 2000
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1046/j.1440-1835.2000.00191.x
Subject(s) - biology , gamete , zygote , navicula , botany , zoology , diatom , sperm , fishery , embryo , embryogenesis
SUMMARY Sexual auxosporulation was observed in a mixed culture of two strains of Navicula directa var. directa . Two gametes did not re‐arrange in their gametangium and each adhered to the inner surfaces of the gametangial theca. Each of the two gametes of one gametangium fused with a gamete of the other gametangium iso‐gamously. As a result, two zygotes and hence two auxo‐spores were produced per paired gametangia. As the gametangial thecae kept close to the gametes during fusion, the zygote became associated with two different thecae. The presence of type IB2a of Geitler's (1973) system was confirmed by the present observations.