chromosome elimination

Different timing and spatial separation of parental chromosomes in intergeneric somatic hybrids between Brassica napus and Orychophragmus violaceus

L. Ding, Zhao, Z. G., Ge, X. H., and Li, Z. Y., Different timing and spatial separation of parental chromosomes in intergeneric somatic hybrids between Brassica napus and Orychophragmus violaceus, vol. 13, pp. 2611-2618, 2014.

Experimental and newly formed hybrids and polyploids generated by wide crosses usually show varying degrees of cytological instability. The spatial separation of parental genomes and uniparental chromosome elimination in hybrid cells has been reported in many hybrids from plants and animals. Herein, the behavior of parental genomes in intergeneric somatic hybrids between Brassica napus and Orychophragmus violaceus was analyzed using genomic in situ hybridization (GISH). In mitotic and meiotic cells, the chromosomes from O.

Mitotic behavior in root tips of Brachiaria genotypes with meiotic chromosome elimination during microsporogenesis

M. F. Felismino, Silva, N., Pagliarini, M. S., and Valle, C. B., Mitotic behavior in root tips of Brachiaria genotypes with meiotic chromosome elimination during microsporogenesis, vol. 7, pp. 336-341, 2008.

Three accessions of Brachiaria brizantha, three of B. humidicola, and two interspecific hybrids between B. ruziziensis and B. brizantha were analyzed with regard to their mitotic behavior in root tips. All these genotypes revealed chromosome elimination or lack of chromosome affinity in previous analyses of microsporogenesis. Analyses of root tips showed a normal mitotic division in all accessions and hybrids, reinforcing the notion that the genetic control of meiosis is totally independent of that of mitosis.

Origin of a polyploid accession of Brachiaria humidicola (Poaceae: Panicoideae: Paniceae)

K. R. Boldrini, Micheletti, P. L., Gallo, P. H., Mendes-Bonato, A. B., Pagliarini, M. S., and Valle, C. B., Origin of a polyploid accession of Brachiaria humidicola (Poaceae: Panicoideae: Paniceae), vol. 8, pp. 888-895, 2009.

Brachiaria humidicola, a species adapted to poorly drained and infertile acid soils, is widely used throughout the tropics. Cytological characterization of 54 accessions of B. humidicola for breeding purposes revealed 2n = 36, 42, and 54 chromosomes. One accession (H030), with 2n = 42 chromosomes, showed a different meiotic behavior. In most accessions from the genus Brachiaria previously studied, the basic chromosome number is x = 9, but the putative basic number in H030 appears to be x = 6.

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