ISHS Acta Horticulturae 813: VI International Symposium on New Floricultural Crops
HIBRIDIZATION BETWEEN PINK AND YELLOW TABEBUIA SPECIES NATIVE TO ARGENTINA (BIGNONIACEAE) |
| Authors: | G. Facciuto, A. Coviella, P. Bologna, M.J. Pannunzio, S. Soto |
| Keywords: | breeding, cultivars, ornamental, pot plant |
| Abstract:
Tabebuia A.I. Gomes ex DC. is a neotropical genus of 100 species, ranging from northern Mexico and the Antillas to northern Argentina (Gentry, 1992). Tabebuia species are shrubs to large trees and they are horticulturally important because of their very showy flowers. In Argentina, there are eight species (Arbo, 1999): T. alba, T. aurea, T. heptaphylla , T. impetiginosa, T. lapacho, T. nodosa, T. ochracea. and T. pulcherrima, some of which are cultivated in the streets but no breeding work has been reported. The main aim of breeding has been to obtain flowering plants quickly (plants that blossom in a short-term cultivation) and compact flowering potted plants. The first objective was accomplished with T. heptaphylla, and then interspecific hybridization was initiated to obtain flower color variation. Selected clones were used for crossings. One pink T. heptaphylla, and two yellow species (T. pulcherrima and T. alba) were crossed reciprocally. Some cross combinations were successful and T. pulcherrima x T. heptaphylla and T. heptaphylla x T. alba hybrids were obtained. Flowers of hybrid plants were characterized: flower size was measured and color was analysed colorimetrycally. Intermediate characteristics were obtained. Pollen viability of the hybrids was determined and some fertile individuals were found. Crossings between related hybrids were possible and segregated progeny were obtained. Some hybrids showed high ornamental potential and were cloned for evaluation. | |
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