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Crop Science Abstract -

Heterosis and Combining Ability in Diallel Crosses of Burley Tobacco, Nicotiana tabacum L.1


This article in CS

  1. Vol. 10 No. 6, p. 705-707
    Received: July 17, 1970

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  1. Paul D. Legg,
  2. G. B. Collins and
  3. 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’ × ‘Burley 37’ and Ky 10 × 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.

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