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Published in Crop Sci 10:705-707 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Heterosis and Combining Ability in Diallel Crosses of Burley Tobacco, Nicotiana tabacum L.1

Paul D. Legg, G. B. Collins and C. C. Litton2

Twelve burley cultivars of N. tabacum L., the 66 possible F1 hybrids among them, and the 66 F2 populations were evaluated during 1966-69. Comparisons of the F1 hybrids with the parents indicated that heterosis values were small but significant for several characters. Two hybrids, ‘Ky 10’ x ‘Burley 37’ and Ky 10 x Experimental line 42, yielded more cured leaf than Ky 10, the highest yielding variety in the test. Percentages of inbreeding depression obtained from comparisons of the Fl and F2 generations in 1969 were also small, but they were significant for some characters.

Estimates of variances for general combining ability were significant for all seven characters studied. Specific combining ability variances were significant for days to flower, leaf width, and yield.

Key Words: Inbreeding depression • Hybrids

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and the Department of Agronomy, University of Kentucky. The investigation reported in this paper (70-3-11-90) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

2 Research Geneticist, Agricultural Research Service, U. S. Department of Agriculture, Associate Professor of Agronomy, University of Kentucky and Research Agronomist, Agricultural Research Service. USDA.

Received for publication July 17, 1970.




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