Genetics of resistance to Groundnut Rosette Virus disease

Summary

Groundnut Rosette Virus disease (GRD) has long been regarded as a major limiting biotic constraint to groundnut production in sub-Saharan Africa (SSA). The disease is caused by a complex of three viral components that interact in a synergistic fashion, resulting in severe crop losses. A study was conducted to better understand the genetics of inheritance of GRD resistance. Nineteen groundnut genotypes, among which were twelve F2 family populations arising from a 3×4 North Carolina II mating design, were evaluated for their percentage disease severity (PDS) and incidence (PDI). There was significant genetic variability for resistance to GRD among the materials studied, with more significant additive gene action as compared to non-additive. However, since specific combining ability effects were not so consistent among the F2 family populations, evaluation and testing of progenies alongside their parents would be more meaningful and selection in the early generations would be the most effective strategy. Further, a narrow sense heritability of 53% suggests that performance of groundnut progenies could be partly predicted by both parental and individual cross means.