Show simple item record M. C. en_US D. en_US Timothy L. W. en_US R. E. en_US 2009-11-24T17:12:52Z 2009-11-24T17:12:52Z 2001 en_US
dc.identifier en_US
dc.identifier.citation Ramirez , M C , Rubiales , D , Carver , T L W & Niks , R E 2001 , ' Abnormal germling development by brown rust and powdery mildew on cer barley mutants ' Hereditas , pp. 2-3 . , 10.1111/j.1601-5223.2001.t01-1-00271.x en_US
dc.identifier.other PURE: 129721 en_US
dc.identifier.other dspace: 2160/3587 en_US
dc.description.abstract The barley leaf rust fungus forms appressoria over host leaf stomata and penetrates via the stomatal pore. High levels of avoidance to leaf rust fungi have been described in some wild accessions of Hordeum species where a prominent wax layer on the stomata inhibits triggering of fungal appressorium differentiation. Leaf rust avoidance has not yet been found in H. uulgare. Since cuticular leaf waxes are implicated in the avoidance trait, we screened 27 ecerijerurn (cer) mutant lines of H. uulgare for avoidance to barley leaf rust. These mutations affect leaf waxes. Reduction in numbers of germ tubes forming appressoria over stomata was found in some lines, but the greatest reduction (ca 30%) was less than previously found in wild barley spp. or in an accession of H. chilense used here as a check. In one line (cer-zh654), avoidance was due to a combination of factors. Firstly, fewer germ tubes orientated towards stomata and so failed to contact them. Secondly, some germ tubes that encountered stomata did not form appressoria but over-grew them. In this line, therefore, the fungus tended to fail both to locate and to respond to stomata. The appressoria of barley powdery mildew form on leaf epidermal cells that they penetrate directly. On certain cer lines, a proportion of germlings of the barley powdery mildew fungus developed abnormally, suggesting that germlings failed to recognise and/or respond to the leaf surface waxes on these mutants. en_US
dc.format.extent 2 en_US
dc.relation.ispartof Hereditas en_US
dc.title Abnormal germling development by brown rust and powdery mildew on cer barley mutants en_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

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