Cytogenetic Characterization of Species and Hybrids of Orchids of Cattleya Genus

This paper aims to study the cytogenetic characterization of Cattleya nobilior species and C. bowringiana and hybrids of orchids C. violacea “type”×C. granulosa, C. violacea “type”×C. harrisoniae “perola,” and C. violacea “type”×C. nobilior “amaliae.” Cattleya nobilior has 2n=2x=30 metacentric chromosomes, with size ranging from 0.54 to 1.58 µm and an active NOR in the first chromosome pair, and C. bowringiana has 2n=2x=34 metacentric chromosomes, from 0.38 to 1.46 µm of size and an active NOR in the first chromosome pair. As for the hybrids, C. violacea “type”×C. harrisoniae “pérola” has 2n=2x=32 metacentric chromosomes, with size from 0.47 to 1.73 µm and an active NOR in the second chromosome pair, C. violacea “type”×C. nobilior “amaliae” has 2n=2x=66 metacentric chromosomes, with size between 0.22 to 1.48 µm and active NORs in chromosome pairs 1 and 3, and C. violacea “type”×C. granulosa with 2n=2x=86 metacentric chromosomes, with size from 0.26 to 1.56 µm and an active NOR in chromosome pairs 3 and 23.