Cytogenetic Characterization of Species and Hybrids of Orchids of <i>Cattleya</i> Genus

Abstract

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.