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Nuclear sieving ofDidymium iridisplasmodia

Authors
Journal
Experimental Mycology
0147-5975
Publisher
Elsevier
Publication Date
Volume
4
Issue
1
Identifiers
DOI: 10.1016/0147-5975(80)90046-8
Keywords
  • Didymium Iridis
  • Heteroplasmon
  • Plasmodium
  • Polyploidy
  • Senescent

Abstract

Abstract The normal diploid plasmodium of the slime mold Didymium iridis can pass through a membrane filter having a uniform pore size of 3 μm and form a new reticulum on the other side; tetraploid plasmodia will not pass through this filter. In similar experiments using senescent plasmodia (which contain both diploid and large polyploid nuclei) only diploid nuclei and cytoplasm pass through the filter. The resultant “filtered” plasmodia live longer than untreated subline plasmodia. Studies involving the transfilter contact of two plasmodia across 1-μm-pore-size Nucleopore filters indicate that heterokyaron incompatibility does not involve a cytoplasmic toxin.

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