 BackResearch Article ScienceAsia 22 (1996): 173-180 |doi: 10.2306/scienceasia1513-1874.1996.22.173 THE INHERITANCE OF ALBINISM IN DENDROBIUM ORCHIDSMONTAKAN VAJRABHAYA AND THAVORN VAJRABHAYAABSTRACT: Seven grexes of dendrobium orchid species and hybrids in the section Phalaenanthe were bred to determine the inheritance of flower calor. It was found that the genes controlling alba and semi-alba phenotypes were similar to those reported earlier in cattleya orchids. The genetic ratios of some of the crosses, however, were unexpected. The adjustment of genotypes was made by designating the kk genes to the white keels of the purple flowers. The same genes, in the homozygous state, suppress the rest of the purple calor in the lip of a hypothetical semi-alba, the flower becoming alba. The designation of the K and k genes is reported here for the first time. The results of distribution of the purple, semi-alba, and alba phenotypes obtained from the crosses, fit the hypothetical genotypes. Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Received May 13, 1996
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