Influence of the direction of crossing on activities of heterosis regarding the height of plants and number of leaves in Burley tobacco hybrids

Ts. Radoukova1*, Y. Dyulgerski2, L. Dospatliev3 1Department of Botany and Teaching methods in Biology, Faculty of Biology, Plovdiv University “Paisii Hilendarski”, 24 Tzar Assen, 4000 Plovdiv, Bulgaria 2Tobacco and Tobacco Products Institute Markovo, 4108 Plovdiv, Bulgaria 3Department
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