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Genetic basis of control of <Emphasis Type="Italic">Rhynchosporium secalis</Emphasis> infection and symptom expression in barley |
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| Authors: | M E Looseley A C Newton S D Atkins B D L Fitt B A Fraaije W T B Thomas R Keith M Macaulay J Lynott D Harrap |
| Institution: | (1) The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK;(2) Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK;(3) KWS UK Ltd, 56 Church Street, Thriplow, Nr. Royston, Hertfordshire, SG8 7RE, UK;(4) Present address: University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK |
| Abstract: | The genetic basis of several different components of resistance to Rhynchosporium secalis in barley was investigated in a mapping population derived from a cross between winter and spring barley types. Both the severity of visual disease symptoms and amount of R. secalis DNA in leaf tissues were assessed in field trials in Scotland in the 2007/2008 and 2008/2009 growing seasons. Relative expression of symptoms was defined as the residual values from a linear regression of amount of R. secalis DNA against visual plot disease score at GS 50. Amount of R. secalis DNA and visual disease score were highly correlated traits and identified nearly identical QTL. The genetic control of relative expression of symptoms was less clear. However, a QTL on chromosome 7H was identified as having a significant effect on the expression of visual disease symptoms relative to overall amount of R. secalis colonisation. |
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