Abstract

BONAMICO, N.C et al. Mapeo de QTL para una medida multivariada de la reacción al virus del mal de Río cuarto. BAG, J. basic appl. genet. [online]. 2013, vol.24, n.2, pp.11-21. ISSN 1852-6233.

The disease severity index (DSI), a multidimensional indicator of resistance, is a weighted average of the severity and incidence of the disease of maize caused by the Mal de Río Cuarto Virus (MRCV). Interval mapping was used in order to detect quantitative trait loci (QTL) associated with the DSI of the Mal de Río Cuarto (MRC) disease in a population of recombinant inbred lines (RILs) of maize tested in environments where the disease is endemic. The results suggest the existence of genomic regions (chromosomes 1, 4, 6, 8 and 10) with a significant effect on MRC. About 40% of the significant intervals were consistent with those identified in previous studies. However, other intervals were associated with the simultaneous expression of symptoms that are not detected when the analysis is performed trait by trait. The results suggest that virus-resistant genotypes can be selected using the particular symptoms of the disease as well as using MRC-QTL.

Keywords : Maize; Recombinant inbred lines; Disease severity index; Microsatellites; Viral disease.

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