Genetic analysis of downy mildew resistance in pearl millet
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Authors
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D.P. DESWAL, O.P. GOVILA and R.K. SHEORAN
Division of Genetics, Indian Agricultural Research Institute, New Delhi 110 012
Keywords:
Genetics, downy mildew, pearl millet, resistanceAbstract
Experiments were conducted to estimate gene effects and G (genetic) X E (environment) interactions for downy mildew disease (caused by Sclerospora graminicola) in pearl millet (Pennisetum glaucum). Six generations of 2 crosses, resistant X susceptible ('PPM1519' X '23B') and susceptible X susceptible ('23B' X PPMI 318'), were grown at 2 locations (Delhi and Villupuram, Tamil Nadu, India) during 1987-88, for disease severity recording. The least square method was applied. It was observed that G X Einteractions were present for downy mildew severity. In the inheritance of resistance to downy mildew both additive and non-additive gene effects were important. Epistatic interactions were present in low magnitude. The duplicate type of epistasis was observed except in the R X S cross at location E1. It is concluded that the utilization of G X E interactions for pathogen expression should be given due consideration in resistance breeding.
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