Abstract
In order to evaluate the occurrence of diffuse kinetochores in Rhynchospora (Cyperaceae), chromosomes of R. pubera were fragmented or fused by g irradiation. This material was investigated in subsequent cell generations, in both mitosis and meiosis. Alterations in number and size of chromosomes were detected, but the anaphase behavior of irradiated chromosomes was normal and no micronucleus was observed. All these data point to the presence of diffuse kinetochores in R. pubera .
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