GENE EFFECTS FOR TOLERANCE TO WEATHER FLECK IN TOBACCO

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Abstract
Five tobacco varieties (flue-cured - White Gold, Hicks Broadleaf, Delcrest, Florida 22, and primitive T.I. 694) were used to produce 6 crosses in order to study the mode of inheritance of tolerance to weather fleck which is a physiological disorder of the plant mainly caused by air-borne oxidizing agents. Six genetic populations were derived from each cross P1, P2, F1, F2, B1, and B2. The incidence of fleck was studied in 1965 and 1966 in replicated tests under conditions of excessive irrigation. The mean rated values of the incidence of weather fleck in the 1st filial generation were higher than the midparent values in 5 out of 6 crosses, suggesting that susceptibility may be dominant over tolerance. Additivity was found important in 2 out of 6 crosses. Dominance as determined by the potence ratio was found important in 5 out of 6 crosses.