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GrainGenes Reference Report: PMP-47-51

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Reference	PMP-47-51
Title	Heat-induced resistance in barley to the powdery mildew fungus Erysiphe graminis f
Journal	Physiology and Molecular Plant Pathology
Year	1995
Volume	47
Pages	51-66
Author	Schweizer P Vallelian-Bindschedler L Mosinger E
Abstract	A heat-treatment (30-60s at 50 degrees C) of young barley seedlings of the highly susceptible cultivar Golden Promise reduced subsequent infection by the powdery mildew fungus Erysiphe graminis f.sp hordei Shorter heat-treatments (30 or 40s) caused transient protection, whereas protection after longer heat-treatments (50 or 60s) was more persistent On heat-treated leaves, the fungus was mainly stopped at the stage of first appressorial penetration, in the absence of papilla formation or hypersensitive cell death Heat-treated leaves produced fewer protoplasts on treatment with cellulase and pectinase than controls thus indicating effects on cell-walls Protection did not correlate with enhanced accumulation of extracellular, pathogenesis-related (PR) proteins, compared to the susceptible interaction on control leaves Two-dimensional analysis of in vitro translation products revealed a pattern of accumulating transcripts 14 h after heat-treatment, that was different from the pattern induced during a 4 h heat-shock period at 38 degrees C, with partial overlap. A new mechanism of acquired resistance is proposed that is independent of papilla formation, hypersensitive cell death or accumulation of extracellular PR proteins but may be based on cell-wall modification and the induction of new host genes.
Keyword	[ Hide all but 1 of 13 ] appressoria erysiphe graminis-f fungal-diseases heat-shock heat-treatment hordeum vulgare induced-resistance infection leaves messenger-rna papilla pathogenesis-related-proteins sp hordei

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