INHERITANCE OF WHITE FLOWER COLOR AND CONGESTED GROWTH HABIT IN CERTAIN BUDDLEIA PROGENIES

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.