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Published in Crop Sci 22:499-503 (1982)
© 1982 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Recessive Alleles for Low Alkaloid Content on Chemical and Agronomic Characteristics of Burley Tobacco1

R. D. Miller, G. B. Collins and D. L. Davis2

Conventional and doubled haploid derived alkaloid lines were studied to determine the effects of recessive alleles for low alkaloid content on chemical and agronomic characteristics of hurley tobacco (Nicotiana tabacum L.). Statistically significant differences were detected among genotypes for total alkaloids, total-N.protein-N, and total volatile nitrogenous bases (TVNB). Levels of total-N and TVNB were higher in high alkaloid lines, but, in general, protein-N was higher in low alkaloid lines. Dominant alleles at both the A and B alkaloid loci were associated with higher levels of total alkaloids, total-N, and TVNB, but lower levels of protein-N, than were recessive alleles. Significant differences in nitrate-N concentrations were not detected between dominant and recessive alleles at either locus. Although significant genotypic differences were detected for several agronomic characteristics, no consistent ranking of genotypes was evident. Conventional lines contained significantly higher concentrations of total alkaloids and TVNB and lower concentrations of protein-N than did doubled haploid-derived lines. Conventional lines had larger bottom leaves, greater yield, and earlier maturity dates than did haploid derived lines.

Key Words: Nicotiana tabacumL • Alkaloid inheritance • Nicotine • Doubled haploids

1 The investigation reported in this paper (80-3-293) was in connection with a project of the Kentucky Agric. Exp. Stn. and is published with the approval of the director. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Former graduate assistant (currently assistant professor, Univ. of Tennessee, Tobacco Exp. Stn., Route 5, Box 113, Green-ville, TN 37743), and professors, respectively, of the Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546.

Received for publication January 29, 1981.




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