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Inheritance of a Diterpene Constituent in Tobacco Trichome Exudate

Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546
USDA-ARS, Phytochemical Res. Unit, Athens, GA 30613

^* Corresponding author.

Altering the levels of - and /ß-duvatrienediols (DVTs), diterpene constituents of trichome exudate, could enhance pest resistance and organoleptic properties of tobacco (Nicotiana tabacum L.). A field study was conducted in 1990 and 1991 to determine the inheritance of DVTs in three tobacco genotypes varying in DVT concentration. KDH 959, which has very low levels of DVTs, was used as a parent in crosses to ‘KY 14’, TI 1068, and KDH 960. The parents, F_l's, and segregating generations from these three crosses were grown in the field. Either DVT concentration or presence of DVTs on the leaf surface was determined using gas chromatography or thin layer chromatography. Results indicated qualitative and quantitative components of DVT inheritance. Segregation ratios suggested that KY 14 and KDH 960 each have a single gene controlling DVT production, but the available F₂ data from the cross involving TI 1068 did not fit the expected ratio for a single gene. Broad-sense heritability estimates for the concentration of DVTs were 0.69 for the two crosses involving KY 14 and KDH 960 and 0.38 for the T.I 1068 cross. These results suggest that selection for DVT concentration would be effective and may be an indirect means to alter pest resistance, flavor, and aroma of tobacco.

Received for publication October 21, 1991.