Summary
Buddleia fallowiana var. alba (FA) was crossed with B. davidii ‘Nanhoensis Alba’ (NA) and both were crossed with the B. davidii cultivars ‘Pink Delight’ (PD) and ‘Royal Red’; seedlings from the FA x NA progeny were backcrossed to the two parents. The pattern of inheritance of white or coloured flowers indicates two loci controlling white flower colour. FA is homozygous for a recessive gene, labelled alb-1, and NA is heterozygous for a dominant gene, Alb-2.
In most segregating progenies some of the white flowered seedlings had a congested habit of growth and this is tentatively ascribed to two dominant complementary genes. NA is heterozygous for Con-1, which is tightly linked with Alb-2. FA and PD are heterozygous for Con-2.
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Tobutt, K.R. Inheritance of white flower colour and congested growth habit in certain Buddleia progenies. Euphytica 67, 231–235 (1993). https://doi.org/10.1007/BF00040625
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DOI: https://doi.org/10.1007/BF00040625