Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 17:943-947 (1977)
© 1977 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Diversity in Burley and Flue-cured Tobacco1

Paul D. Legg, J. F. Chaplin and R. E. Williamson2

Chlorophyll content in burley and flue-cured tobacco, Nicotiana tabacum L., is influenced by genetic factors at two major loci. Burley is genotypically yb1yb1yb2yb2 an has a low chlorophyll level in growing plants; whereas, a dominant allele at either locus will give a high level of chlorophyll characteristic of flue-cured tobacco. A backcrossing program was used to obtain lines that were near isogenic for all genetic factors except alleles at the yb loci. Comparison of converted burley fines (ones carrying a Yb allele) with flue-cured cultivars and tests comparing the near isogenic lines indicated that most of the genetic differences between flue-cured and burley tobacco in chemical composition resulted from the influence of alleles at the two yb loci. The only differences between the two classes were for polyphenols and reducing sugars, and these may have been independent of the yb loci. Even these two constituents, however, showed as much diversity within classes as between classes.

Key Words: Genetic vulnerability • Isogenic lines • Chemical composition • Chlorophyll genotypes

1 Contribution from the Southern Region, ARS, USDA, the Dep. of Agronomy, Univ. of Kentucky, and the Dep. of Crop Science, North Carolina State Univ. The investigation reported in this paper was in connection with projects of the Kentucky and North Carolina Agric. Exp. Stns. and is published with approval of the directors as paper no. 76-3-199 and 5212 of the respective Journal Series.

2 Geneticist, ARS, USDA and professor, Dep. of Agronomy, Univ. of Kentucky research agronomist, ARS, USDA, Oxford, N.C. and professor, Dep. of Crop Science, North Carolina State Univ.; and plant physiologist, USDA, ARS, Oxford, N.C., respectively.

Received for publication March 19, 1977.




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Copyright © 1977 by the Crop Science Society of America.