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GrainGenes Reference Report: PMP-61-65

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Reference	PMP-61-65
Title	Gene expression of a vacuolar peroxidase with stress-induced pathogenesis in wheat sheaths
Journal	Physiological and Molecular Plant Pathology
Year	2002
Volume	61
Pages	65-71
Author	Bishop DL
Abstract	Summary: Changes in peroxidase composition and gene expression of a vacuolar-localized peroxidase (cDNA, pCD1311), which has previously been reported to be involved in resistant interactions between barley and Erysiphe graminis were examined in two wheat-endophytic fungal pathosystems. These changes were examined in wheat infected with endophytic, Fusarium proliferatum (F.p.) that produced symptomatic plants only under conditions of host stress and Fusarium culmorum, a ubiquitous and potent pathogen. Increased apoplastic peroxidase specific activity and the induction of three novel cationic peroxidase isozymes (pI 8.0, 9.0, 10.0) occurred only in sheaths infected with the F.p. Induction of these isozymes was not found in wheat sheaths infected with F. culmorum that exhibited a classical susceptible response or in the non inoculated, control sheaths. A 1.5 kb mRNA transcript accumulated in the F.p.-infected wheat sheaths and not in those infected with F. culmorum or in the non infected controls. Further investigation using in situ hybridization analysis revealed that accumulation of pCD1311-related mRNA transcripts in F.p.-infected sheaths occurred in the epidermal, vascular bundle sheath and xylem cells and coincided to the localized areas of F.p. infection
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