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Linkage Between Two Traits Both Controlled By Duplicate Genes in Tobacco¹

Linkage was detected between powdery mildew resistance and female sterility, both of which are controlled by recessive duplicate genes in tobacco. An F₁ hybrid was obtained by crossing a resistant sterile line (pm₁ st₁/pm₁ st₁, pm₂ st₂/pm₂ st₂) with the susceptible fertile tobacco variety ‘Hicks.’ F₂, F₃, and testcross data were used for estimating linkage intensity by the method of maximum likelihood. A combined linkage intensity was estimated and heterogeneity of the linkage values was tested by using Fisher's scoring method. It was found that pm₁ and st₁ and pm₂ and st₂ were linked on both chromosomes with the same intensity of 89.81% ± 0.87% (or recombination value 10.19%). A heterogeneity test indicated that the linkage intensities estimated from varioats types of data were homogeneous. Assumptions used in the process of estimating linkage intensity were discussed.

² Formerly Head of the Division of Tobacco Breeding (now Professor of Genetics, National Taiwan University) and Senior Plant Breeder, Taiwan Tobacco Research Institute, Taichung, Taiwan, China.

Received for publication September 21, 1966.