Influence of the direction of crossing on heterosis and transgression events in relation to the length of the vegetative period of Burley tobaccos variety group

Y. Dyulgerski2, T. Radoukova2*, L. Dospatliev3 1Tobacco and Tobacco Products Institute, Markovo, 4108 Plovdiv, Bulgaria 2Department of Botany and MOB, Faculty of Biology, Plovdiv University “Paisii Hilendarski”, 24 Tzar Assen, 4000 Plovdiv, Bulgaria 3Department of Pharmacology, Animal
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