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Published in Crop Sci 22:144-146 (1982)
© 1982 Crop Science Society of America
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Variation of Polyphenols in Flue-Cured Tobacco Cultivars Attributed to Location, Stalk Position, and Year1

R. E. Williamson2 and G. R. Gwynn3

Levels of polyphenols in tobacco (Nicotiana tabacum L.) leaf are associated with certain constituents in the smoke. This study was designed to determine the variability in levels of polyphenols in several cultivars of flue-cured tobacco as influenced by stalk position, location, and year. The levels of polyphenols were compared in cured leaves from bottom, middle, and top stalk positions of 13 cultivars grown at four locations for 2 years. There were differences among cultivars for polyphenol level. ‘NC 2326’ had the highest level with 4.25% and ‘Speight G-28’ had the lowest with 3.58%. Highly significant differences in levels of polyphenols associated with stalk position were measured (3.15, 4.11 and 4.42% for the bottom, middle, and top position, respectively). There were significant interactions of locations by the seasons experienced in the 2 years. Interactions involving cultivars were not significant in most cases, and where they were, it involved higher order interactions. This was also true for stalk positions. The presence of cultivar differences and the consistency of these differences would encourage breeding efforts but testing over locations and years would be advisable.

Key Words: Chlorogenic acid • Rutin • Phenols • Cultivars • Tobacco

1 Cooperative investigations of the Oxford Tobacco Res. Lab., AR/SEA/USDA, Oxford, N. C. and Dep. of Crop Science, North Carolina State Univ., Raleigh. Paper No. 6627 of thejournal Series of the North Carolina Agric. Tobacco Research Service, Raleigh.

2 Research Plant Physiologist, Tobaco Res. Lab., AR/SEA/USDA, Oxford, NC 27565.

3 Research agronomist, Tobacco Res. Lab., AR/SEA/USDA, Oxford, NC 27565 and associate professor, Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27650.

Received for publication October 24, 1980.




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