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© 1974 Oxford University Press

RESEARCH-ARTICLE

Vacuolation in Nitella flexilis (Characeae)

B. A. SILVERBERG and T. SAWA

Department of Botany, University of Toronto Toronto, M5S 1A1, Canada

In Nitella flexilis, a species belonging to the section Anarthrodactylae of the genus Nitella (Characeae), some mature cells, with the exception of those of the nodal complex and the rhizoid, show numerous spherical vacuoles occupying the entire central region of the cell. These vacuoles are fairly uniform in size measuring 30–40 µm in diameter. Evidence is presented from investigations with the light and electron microscopes suggesting that some mature cells of a certain group of Nitella species may not have a huge central vacuole. Vacuolation in young cells of the apex apparently begins by progressive dilation of the endoplasmic reticulum. The Golgi complex may also be involved in vacuolation. The necessity for re-examination of certain biological activities in the giant internode cell is explored.


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