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Inheritance and Possible Use of Pale Yellow Character in Tobacco¹

The chlorophyll deficient T.I. 1372 tobacco (Nicotiana tabacum L.) is characterized by a slightly lighter green color in the seedlings than that of normal green varieties. With the approach of maturity, all the leaves on the T.I. 1372 plants turn yellow at about the same time. This character is designated as pale-yellow and is controlled by the dominant gene (Py). The possible use of the pale-yellow character in reducing the number of harvests in flue-cured tobacco was investigated. The tobacco was harvested by the conventional regime (six harvests) and in one and two harvests. Yield was lower in the one and two harvests than in the conventiinal regime and the value per 45.4 kg was the same for all harvest regimes. Total alkaloids and alpha amino nitrogen were reduced and reducing sugars increased as the number of harvests decreased. However, suggestions were made to overcome the differences in yield and chemical analysis so that all of the tobacco could be harvested in one or two operations. The pale-yellow character may possibly have a use in fluecured tobacco for single or two harvest operations, which could eliminate the necessity for human judgment in harvesting each ripened leaf. This could greatly facilitate the use of mechanized equipment for harvesting.

Key Words: Nicoliana tabacum • Fkue-cured • Burley • Chlorophyll deficient • Mechanized harvesting

² Principal Agronomist, Crops Research Division, ARS, USDA, Beltsville, Md. 20705. Formerly of the Tobacco Research Station, Oxford, N. C. and Professor of Crop Science, North Carolina State University.

Received for publication August 8, 1968.