| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
Recent studies have led to a rapid increase in knowledge on auxospore formation in diatoms. However, these studies have been limited to centric and raphid pennate diatoms and there is still very little information for the araphid pennate group. We studied the diversity of the auxospore and the initial cell of about 30 taxa in Japanese samples. Genus Lampliscus, Arachnoidiscus, Grammatophora, Ethmia, Gephiria, Eunotia, Achnanthes, Cocconeis, Neidium, Diploneis, Amphora, Entomoneis.
These materials were studies using LM and SEM. SEM observation revealed that many transverse perizonial bands, all of which were incomplete rings. There was an irregular longitudinal structure beneath the ventral suture of the transverse perizonium. This structure is presumably equivalent to the longitudinal perizonium in other pennate diatoms. Scales were found both in the inner wall of the perizonium and around the primary perizonial bands in almost species. Presence or absence of scales reflect the phylogenetical trends of diatoms, and when and where exist scales depends on the auxospore structure.
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