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Identification of a new adult plant resistance gene for scald (Rhynchosporium secalis) in barley
Conference paper   Open access

Identification of a new adult plant resistance gene for scald (Rhynchosporium secalis) in barley

M. Cakir, H. Wallwork, S. Gupta, D. Moody, K. Williams and C. Li
9th International Barley Genetics Symposium (Brno, Czech Republic, 20/06/2004–26/06/2004)
2004
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Abstract

The identification and deployment of disease resistance genes are key objectives of Australian barley breeding programs. A doubled haploid (DH) population derived from the cross VB9104 × Dash was used to identify markers for resistance to scald (Rhynchosporium secalis). The map comprised of 205 markers including SSRs and AFLPs. The population was assessed for severity of scald during grain fill in a field trial in South Australia. Marker analysis was performed using the software packages Mapmanager and Qgene. QTL analysis identified a region on chromosome 3H, associated with scald resistance in a number of studies, and a region on 4H which has not previously been associated with scald resistance. R2 values for the 3H and 4H chromosome regions were 29% and 22%, respectively. Multiple regression analysis of these two QTLs explained 42% of the variation. There are a number of markers showing strong associations with the resistance in these regions. These markers present an opportunity for marker assisted selection of lines with resistance to scald in barley breeding programs.

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