Introgression of yellow flower colour in Buddleja davidii by means of polyploidisation and interspecific hybridisation

K. Van Laere, J. Van Huylenbroeck and E. Van Bockstaele
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K. Van Laere: Institute for Agricultural and Fisheries Research (ILVO), Plant Sciences Unit, Applied Genetics and Breeding, Melle, Belgium
J. Van Huylenbroeck: Institute for Agricultural and Fisheries Research (ILVO), Plant Sciences Unit, Applied Genetics and Breeding, Melle, Belgium
E. Van Bockstaele: Institute for Agricultural and Fisheries Research (ILVO), Plant Sciences Unit, Applied Genetics and Breeding, Melle, Belgium

Horticultural Science, 2011, vol. 38, issue 3, 96-103

Abstract: To introduce yellow colour in the commercial Buddleja davidii (2n = 4x = 76) assortment, an interspecific breeding programme with B. globosa (2n = 2x = 38) was started. The first step was to perform chromosome doubling in B. globosa. Two of the obtained tetraploid B. globosa plants were subsequently used as male parent in interspecific crosses with the white flowering B. davidii cv. Nanhoensis Alba. In total 182 interspecific crosses were made and 18 F1 hybrids were obtained. Genome size measurements, chromosome counts and genomic in situ hybridisation (GISH) analysis proved the hybrid nature of most of the F1 hybrids. Plant morphology also expressed hybrid characteristics. F1 seedlings inherited the yellowish flower colour from B. globosa. As for many other woody ornamentals, the creation of hybrids through interspecific hybridisation along with polyploidisation offers new opportunities for breeding in Buddleja.

Keywords: chromosome number; genome size; genomic in situ hybridisation (GISH); morphology; ornamental breeding (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlhor:v:38:y:2011:i:3:id:61-2011-hortsci

DOI: 10.17221/61/2011-HORTSCI

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