Asexual nuclear division in <i>Neocosmospora</i>

Abstract

A fungus isolated from soybean stem material showed marked similarities to two existing species of Neocosmospora, i.e. N. vasinfecta E. F. Smith and N. africana von Arx. The processes o f somatic nuclear division in authentic cultures of these two species and the new isolate were examined to determine the nature of the mechanism of nuclear division and whether there were any differences among the cultures. N o significant differences were observed. The divisions showed asynchronous anaphase disjunction but there was no evidence o f aneuploidy or irregular reconstitution of daughter nuclei. Nuclear division was interpreted as being strictly mitotic. RESUME CAR YOCINESE ASEXUEE CHEZ NEOCOSM OSPORA Une moisissure isolee de tiges de soya a montre des res semblances marquees avec deux especes existantes de Neocosm ospora, soil N. vasinfecta E. F. Smith et N. africana von Arx. Les processus de caryocinese somatique out ete examines dans des cultures authentiques de ces deux especes et dans le nouvel isolat pour determiner la nature du mecanisme caryocinetique et rioter les differences entre cultures s'il y en a. On n a pas observe de differences significatives. Les divisions ont montre une dislonction asynchrone a I'anaphase, mais il n y avail aucun signe d'aneuploidie ou de reconstitution irreguliere de noyaux-fils. La caryocinese a ete interpretee comme etant strictement mitotique. REVIEWReported mechanisms of somatic nuclear division in the fungi seem to fall into two basic categories, i.e. divisions which are essentially mitotic, differing only slightly from the classical concept, and nonmitotic divisions in which completely different processes are operative.Divisions in a large variety of fungi were shown to differ from mitosis in higher plants only in that the nuclear membrane was persistent throughout the

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