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Journal of Cell Science, Vol 11, 49-58, Copyright © 1972 by Company of Biologists

Submitted on December 26, 1971

Acceleration of Nuclear Growth and Advanced Initiation of Mitosis in U.V.-Irradiated Plasmodia of Physarum Polycephalum

MAUREEN M. TELATNYK 1 and E. GUTTES 1

1 Division of Biology, The University of Texas at Dallas, Texas 75230, U.S.A

In the multinucleated plasmodia of Physarum polycephalum the intermitotic period lasts from 2.5-5 days on diluted (1:8) growth medium and 3-7 days on non-nutrient balanced salt solution. When such plasmodia were irradiated with u.v. light approx. 15-20 h after mitosis, the next mitosis was considerably advanced and the intermitotic period lasted only between 36-48 h. During this time, numerous nuclei became pyknotic and disappeared, while the others became larger than in unirradiated controls. It is proposed that the abbreviation of the intermitotic period preceding the first post-irradiation mitosis was caused by incorporation into the surviving nuclei of a substance(s) which was released from the degenerating nuclei.

Submitted on December 26, 1971






© The Company of Biologists Ltd 1972