Abstract

The course of cytoplasmic fission in the vegetative cells of a mutant of the multicellular green alga Ulva mutabilis is described on the basis of electron micrographs. The division involves rearrangement of chloroplast, nucleus and Golgi apparatus relative to each other and the importance of these movements to morphogenesis is discussed. The chloroplast is bisected by the advancing division furrow and its division might involve synthesis of thylacoid membranes. This might explain why photosynthetic capacity increases during the division period as reported earlier.

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