Combining ability for resistance in peanut (Arachis hypogaea) to Peanut bud necrosis tospovirus (PBNV)

Abstract

SummaryThe combining abilities of field resistance to peanut bud necrosis disease (PBND) caused by Peanut bud necrosis tospovirus (PBNV) were examined to understand the type of gene action governing resistance to the disease, and to identify peanut lines suitable for use as parents in a PBND‐resistance breeding programme. The Ft and F2 progenies from a six‐parent diallel cross and their parents were evaluated under field conditions. They were assessed for disease incidence at 30, 40, 50 and 60 days after planting (DAP), and reactions of the lines to the disease could be best differentiated at 50 and 60 DAP. Results indicated highly significant general combining ability (GCA) effects for PBND incidence in F1 and F2 generations. Specific combining ability (SCA) and reciprocal effects were also found to be significant, but their relative contributions to variation among crosses were much less than those of GCA effects. These results suggested that the type of gene action governing resistance to PBND was mainly additive, and selection for PBND resistance in these populations should be effective. Strong correlation coefficients between parental means and GCA effects for disease incidence were seen in both Ft and F2 generations, suggesting that per se performance of the parental line could be used as a predictor of the capability of the line to transmit its PBND‐resistant attribute to progenies. The reciprocal effects were in favour of using resistant lines as female parents. The peanut lines ICGV 86388, 1C 10 and 1C 34 were found to be suitable for use in a PBND–resistance breeding programme.

Genetic analysis of resistance to watermelon bud necrosis orthotospovirus in watermelon [Citrullus lanatus (Thunb.) Matsum & Nakai]

“…Dominance effects were nonsignificant in both the crosses, whereas dominance × dominance component was significant in the cross IIHR‐19 × IIHR‐140. As observed in the current experiment, Pensuk, Wongkaew, Jogloy, and Patanothai (), Buiel () and Pensuk, Jogloy, Wongkaew, and Patanothai () also reported the occurrence of both additive gene action and nonadditive gene action for GBNV resistance in peanut.…”

Genetic molecular diversity in interspecific peanut lines differing in temporal resistance to peanut bud necrosis disease

“…The rest of the lines were moderately resistant to highly susceptible (Figure 1). Screening under field conditions at hot spot location has been used earlier for selection of peanut lines resistant to PBND (Pensuk et al, 2002a(Pensuk et al, , 2002b(Pensuk et al, , 2004Sunkad et al, 2012). Selected highly resistant, resistant and one susceptible elite cultivar were subjected to genetic diversity analysis (Table 1).…”

Combined selection and multivariate analysis in early generations of intraspecific progenies of peanuts

“…It is known that the additive effects prevail over the non-additive in many traits of peanuts, including early flowering, size of pods and seeds, number of pods per plant, resistance to certain diseases, weight of pods and seeds, among others (Cruickshank et al, 2002;Pensuk et al, 2002;Jogley et al, 2005;Hariprasanna et al, 2008). In general, when considering the significant genetic correlations between most traits discussed here and the indication of prevalence of additive effects over the nonadditive for most descriptors evaluated here, success is expected to occur at the early selection of genotypes, since the selection of the best progenies possibly contributes to maximize variance between traits in the following generations.…”