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On the Morphogenetics of the Desmids

Paavo Kallio
Bulletin of the Torrey Botanical Club
Vol. 80, No. 4 (Jul. - Aug., 1953), pp. 247-263
Published by: Torrey Botanical Society
DOI: 10.2307/2481760
Stable URL: http://www.jstor.org/stable/2481760
Page Count: 17
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On the Morphogenetics of the Desmids
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Abstract

1. Artificially produced uni-, tri- and quadriradiate cells of some species of Micrasterias have been described. 2. The theory of plasmastructural units facilitates the understanding of the morphological similarities between diploid biradiate cells and haploid uniradiate cells as well as the similar features of the rays in the biradiate haploid and quadriradiate diploid cells. 3. In all instances increased nuclear influence per cytoplasmic axis corresponding to one ray results in "diploid features": in the diploid cell because the number of the rays has remained unaltered while the nuclear mass has increased and in the uniradiate cell because the number of the rays has decreased while the nucleus has remained unaltered. 4. On the other hand one characteristic depending on the relative nuclear effect is very significant: the number of plasmastructural units (number of the rays) and the nuclear mass per cell are correlated in a high degree. The increase in the number of plasmastructural units has resulted from a branching of the existing plasmastructural units at an early stage of the formation of these units. The nucleoplasmic ratio is preserved to a large degree and thus the number and the size of the rays compensate each other.

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