Abstract
Abstract The intersectional hybrids, Oncidium altissimum × O. sarcodes and O. floridanum × maculatum, and the intergeneric hybrid, Odontoglossum stenoglossum × O. macuiatum (all with 2n = 56), showed near normal meiosis with 27 or 28 bivalents per pollen mother cell indicating strong homology of parental genomes. Trichocentrum albopurpureum (2n = 24) × O. lanceanum (2n = 26) exhibited fair homology of parental genomes with the formation of 6 to 10 bivalents out of the possible 12. The other intersectional hybrids, O. pulvinatum (2n = 42) × O. floridanum (2n = 56), O. triquetrum (2n = 42) × O. floridanum (2n = 56), O. microchilum (2n = 36) × O. floridanum (2n = 56) and O. microchilum (2n = 36) × O. onustum (2n = 56) and the intergeneric hybrid, Comparettia falcata (2n = 42) × O. onustum (2n = 56) showed highly irregular meiotic behavior with poor chromosome pairing. The number of bivalents in these hybrids ranged from 1.4 to 9.5, indicating poor genome relationships of the parental species.
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