Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 21:692-695 (1981)
© 1981 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Chlorophyll Content on Smoke Constituents in Burley and Flue-cured Tobacco1

Paul D. Legg and James F. Chaplin2

Cultivars of burley and flue-cured tobacco (Nicotiana tabacum L.) differ in chlorophyll content of growing plants and in many chemical components. The present research was undertaken to determine the genetic diversity between burley and flue-cured tobacco for smoke components and the influence of chlorophyll level on the components. A backcrossing program was used to obtain near isogenic lines for all genetic factors except alleles at the two loci controlling chlorophyll level. Comparisons among standard cultivars indicated that burley cultivars were generally higher in tar/puff and nicotine/cigarette puff and lower in number of puffs/cigarette than flue-cured cultivars. The chlorophyll content influenced the level of nine of the 10 cigarette characteristics and accounted for the difference between burley and flue-cured cultivars for number of puffs/cigarette. Diversity between the two classes of cultivars for tar/puff and nicotine/puff was not totally due to chlorophyll differences. Interclass crosses might be useful in breeding improved cultivars for these components.

Key Words: Genetic vulnerability • Isogenic lines • Cigarette composition • Chlorophyll genotypes • Genetic diversity • Nicotiana tabacum L.

1 Contribution from the Southern Region, USDA, SEA-AR, 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. Stn. and is published with approval of the directors as Paper No. 80-S-62 and 6431 of the respective Journal Series.

2 Research geneticist, USDA, SEA-AR, Beckley, WV; and research agronomist, USDA, SEA-AR, Oxford, NC, and professor, Dep. of Crop Science, North Carolina State Univ.

Received for publication September 11, 1980.




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Copyright © 1981 by the Crop Science Society of America.