Inheritance of sterility mosaic disease resistance to Bangalore and Patancheru isolates in pigeonpea (Cajanus cajan (L.) Millsp.)
Keywords: inheritance, pigeonpea, resistance, sterility mosaic, susceptibility
AbstractSterility mosaic disease (SMD), is an important biotic constraint in pigeonpea (Cajanus cajan (L.) Millsp.) in Indian
subcontinent. It is caused by a virus and transmitted by eriophyid mites, Aceria cajani Channabasavanna. A comprehensive study
of variability in the sterility mosaic pathogen revealed the occurrence of five different isolates in India. Amongst them, three
distinct isolates have been characterised, viz., Bangalore, Patancheru and Coimbatore. Studies were conducted at Bangalore and
Patancheru to determine the inheritance of resistance to Bangalore and Patancheru isolates of the SMD involving a resistant (ICP
7035) and susceptible (TTB 7) genotypes. Observations in parents, F1 indicated dominance of susceptibility over resistance. The
disease reaction of the individual F2 plant derived F3 families for Patancheru isolate was controlled by two genes with dominance
epistasis and for Bangalore isolate, absence of resistant plants indicate action of two or more genes in controlling resistance to
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