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Plant-microbe interactions Affairs of the plant: colonization, intolerance, exploitation and co-operation in plant-microbe interactions

1998; Elsevier BV; Volume: 1; Issue: 4 Linguagem: Inglês

10.1016/1369-5266(88)80047-5

1879-0356

Jeff Dangl, Jonathan D. G. Jones,

Plant Pathogens and Resistance

Defence reactions between Blumeria graminis f. sp. tritici (Bgt) and pepper cultivar 'A11' (nonhost) and susceptible wheat cultivar 'Shan 225' were studied histochemically. Conidia of Bgt developed normally on the wheat leaves with limited detectable whole-cell H2O2 accumulation and cell death. In contrast, the germination of conidia on the pepper leaves was delayed. High frequency of H2O2 accumulation and hypersensitive response (HR) were detected in the nonhost interactions. H2O2 accumulation was accompanied by HR and papilla formation. These results indicate that H2O2 and HR play important roles in preventing colonization and disease development of nonhost-pathogen Bgt in pepper plants.