Show simple item record Barry J. en_US Timothy L. W. en_US Alison J. en_US 2010-01-04T10:57:51Z 2010-01-04T10:57:51Z 2002 en_US
dc.identifier en_US
dc.identifier.citation Thomas , B J , Carver , T L W & Wright , A J 2002 , ' Early adhesion of Blumeria graminis to plant and artificial surfaces demonstrated by centrifugation ' Physiological and Molecular Plant Pathology , pp. 217-226 . , 10.1006/pmpp.2002.0432 en_US
dc.identifier.other PURE: 133382 en_US
dc.identifier.other dspace: 2160/3928 en_US
dc.description.abstract The relative strength of adhesion by Blumeria graminis conidia and germlings to barley leaves and to clean (hydrophilic) or silanized (hydrophobic) glass, was assessed using centrifugation. Ungerminated conidia were incubated for 10 or 30 min before centrifugation, while extended incubation, for up to 12 h, allowed germlings to reach different developmental stages before treatment. After incubation, mounts were subjected to relative centrifugal force (RCF) ranging from 0.13 × 103 to 26.00 × 103. Two key features indicating adhesion strength were the minimum RCF required for displacement of any fungal units, and the percentage of these displaced by the maximum RCF. By these criteria, adhesion was far stronger after germination, presumably because germ tubes adhered to substrata. Ultimately, germlings adhered more strongly to leaves, where appressoria differentiated, than to clean glass where only multiple short germ tubes were formed. Ungerminated conidia adhered relatively weakly to host leaves and most strongly to silanized glass. Increasing incubation time did not increase their adhesion to leaves but conidia incubated for 30 min adhered more strongly to clean and silanized glass than those incubated for only 10 min. Thus, in general, the strength of adhesion by ungerminated conidia correlated to known differences in the speed of conidial extracellular material (ECM) release and to the quantity of ECM released on the different substrata. However, even on leaves where ungerminated conidia showed the weakest adhesion, about 80% of conidia were not displaced by RCF of 0.13 × 103. Under these circumstances conidia had been subject to about 4.2 × 10−9 N force acting to displace them. This is far greater than the forces likely to be generated by wind acting on conidia deposited on the leaves of a barley crop. Thus, adhesion by ungerminated conidia is sufficient to hold the majority of spores in place even under very windy field conditions. en_US
dc.format.extent 10 en_US
dc.relation.ispartof Physiological and Molecular Plant Pathology en_US
dc.title Early adhesion of Blumeria graminis to plant and artificial surfaces demonstrated by centrifugation 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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