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Heterosis and Combining Ability in a Diallel Cross Among Nine Varieties of Oriental Tobacco¹

Nine varieties of oriental tobacco and all possible F₁ hybrids among them were evaluated at two locations in srael. Yield of cured leaves, mean weight per cured leaf, number of leaves per plant, plant height, combustibility, total alkaloid content, and days to flowering were determined.

The average yield of cured leaves of the hybrids was 21% above that of the parental varieties. Other traits with the exception of combustibility and total alkaloid content exhibited significant heterotic effects. The magnitude of heterosis was similar at both locations.

The ranking of the varieties according to their relative general combining ability was similar, in most cases, to their ranking according to parental performance. It was suggested that additive genetic variance was predominant for all the traits that were examined, but there was an indication that nonadditive components of genetic variance may also be present. We concluded that the procedure of selecting homozygous lines from the segregating progeny of a cross would be more suitable than using first-generation hybrid varieties for breeding oriental tobacco.

² Senior lecturer and former graduate student, respectively.

Received for publication June 1, 1965.