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Among 25 accessions of Brachiaria brizantha in the Embrapa Beef Cattle collection, one accession (GC 1113/95) presented a severe case of chromosome stickiness in meiosis, impairing normal chromosome segregation. Accession was tetraploid (2n =4x=36) with chromosomes pairing in bivalents and few quadrivalents at diakinesis. Stages of prophase I were normal and chromosome stickiness became evident from metaphase I persisting to microspore stage. Bridges of different thickness were formed in anaphase I and II by chromosomes that did not separate. Some of them even persisted until telophase stages. The precise causes of chromosome stickiness could not be ascertained, but genetic factors might be controlling the phenomenon, since only this accession cultivated on Brazilian savannas under the same environmental conditions of the 24 other accessions presented the abnormality.

A Severe Case of Chromosome Stickness in Pollen Mother Cells of Brachiaria brizantha (Hochst.) Stapf (Gramineae).