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Linkage Between Two Traits Both Controlled By Duplicate Genes in Tobacco 1
Author(s) -
Wan Hsiung,
Chang E. Y.
Publication year - 1967
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1967.0011183x000700020020x
Subject(s) - biology , linkage (software) , powdery mildew , genetics , genetic linkage , gene , botany
Linkage was detected between powdery mildew resistance and female sterility, both of which are controlled by recessive duplicate genes in tobacco. An F 1 hybrid was obtained by crossing a resistant sterile line ( pm 1 st 1 /pm 1 st 1 , pm 2 st 2 /pm 2 st 2 ) with the susceptible fertile tobacco variety ‘Hicks.’ F 2 , F 3 , 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 pm 1 and st 1 and pm 2 and st 2 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.