Author(s):

Archana R, HC Lohithaswa, MS Uma, KV Shivakumar, VB Sanathkumar and R Pavan

Abstract: The present investigation was conducted to understand the genetics of resistance to Fusarium stalk rot (FSR) resistance in maize through six-generation mean analysis in the cross, CM202 × P12 during kharif 2017. CM202 was a resistant line to FSR disease while P12 was highly susceptible. The F₁ showed susceptible reaction to the disease. The scaling tests and joint scaling tests indicated the inadequacy of additive-dominance model and showed the presence of epistatic gene effects in the cross for Fusarium stalk rot resistance. Further study of genetic effects revealed the preponderance of additive and additive × additive gene effects in the expression of FSR and duplicate type of interaction was observed in the expression of disease. The potence ratio of more than one indicated that FSR could be under control of over dominance. The number of effective factor was found to be one with high heritability estimate in the inheritance of resistance to FSR which indicated the effectiveness of simple selection strategies in isolating superior inbreds.

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