Genetics of Alternaria Leaf Blight Resistance in Indian Mustard [Brassica Juncea (L.) Czern and Coss.]

Inheritance of Alternaria leaf blight diseases in Indian mustard (Brassica juncea L. Czern & Coss) investigation experiments which were carried out during 2006–07, 2007–08 and 2008–09 at G.B. Pant University of Agriculture and Technology, Pantnagar. Results based on generation mean analysis of per cent disease index (PDI) showed significant estimates of additive [d], and dominance [h] effects as well as all the three types of epistasis in all the three crosses. The opposite signs of [h] and [l] indicated that duplicate epistasis was operative in the inheritance of Alternaria leaf blight in the material studied.