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Diallel Crosses Among Maryland Cultivars¹ of Tobacco¹

Five cultivars and the diallel set of 10 F₁ hybrids of tobacco (Nicotiana tabacum L.) were grown at 2 locations in 1967. The diallel was expanded in 1968 to include 7 cultivars and 21 F₁ hybrids. Also in 1968, F₁ and F₂ hybrids from the 5-parent diallel were grown at one location in order to obtain estimates of inbreeding depression. For both years, a significant heterotic response was observed for four agronomic traits. On the average, the F₁ hybrids produced more yield and dollars per hectare, had a higher price ($/kg), and flowered earlier than the cultivars. A significant inbreeding depression was found with the F₂ hybrids for value ($/ha), price ($/kg), and days to flower.

From the 7-parent diallel, estimated variability for general combining ability was significant for 6 of the 10 traits studied, but specific combining ability estimates were small and nonsignificant. F₁ hybrids in the 5-parent diallel did not vary significantly.

Key Words: Heterosis • Hybrid tobacco • Inbreeding depression • Nicotiana tabacum L.

² Assistant Professor, Department of Biology, Morgan State College, Baltimore, MD 21239 (former Graduate Assistant, Department of Agronomy, University of Maryland), and Associate Professor, Department of Agronomy, University of Maryland, respectively.

Received for publication August 18, 1973.