Selection For Resistance and Tolerance to Oat Mosaic Virus and Oat Golden Stripe Virus in Hexaploid Oats

Abstract

Coker 716, a hexaploid oat cultivar resistant to both oat mosaic virus (OMV) and oat golden stripe virus (OGSV) was crossed to three susceptible cultivars (Brooks, Madison, and Tech) to form three individual populations. Individual breeding lines were derived from each cross in the F2 generation and tested in plots consisting of equally spaced individual hills in OMV- and OGSV-infested soils and non-infested soils to evaluate resistance and yield loss of individual lines. Foliar symptoms, harvest index, and yield loss were examined as selection criteria for resistant genotypes. The study was conducted over 2 years at two North Carolina locations that differed in soil type and climate. Multiple regression models describing yield loss in each cross due to rating, year, and location were calculated. Coefficients of multiple determination in these models ranged from 0.39 to 0.51. Yield loss ranged from 39 to 60% among different crosses. Infection by OMV and OGSV accounted for the majority of yield loss in two of the populations. Disease severity varied widely over years and locations. The results suggest that selection of lines with symptomatic tissue of 10% or less, or selection of tolerant lines, is needed for breeding progress.

Epistatic determinism of durum wheat resistance to the wheat spindle streak mosaic virus

“…4 ). Such complex genetic control has already been observed for two other viruses transmitted by P. graminis (Walker et al 1998 ; Gutiérrez et al 2010 ). On WYMV, a bymovirus relatively close to WSSMV (Liu et al 2016 ), the Qym1 and Qym2 locus also seemed to have a positive interaction effect, as resistant alleles at the two loci were necessary to get a high level of resistance (Suzuki et al 2015 ).…”

Molecular mapping of genomic regions underlying barley yellow dwarf tolerance in cultivated oat (Avena sativa L.)

“…Depending on viruses, vectors could be fungi (Walker et al 1998), mites (Marcon et al 1999), leafhoppers (Welz et al 1998;Pernet et al 1999) and aphids (Jin et al 1998;BarbosaNeto et al 2000;Scheurer et al 2001). No efforts were made to isolate QTLs for vector resistance and QTLs for virus resistance in this or previous QTL mapping studies.…”

Polymyxa graminis and the cereal viruses it transmits: a research challenge

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