HYDROGEN PEROXIDE INDUCTION IN BARLEY- COCHLIOBOLUS SATIVUS INTERACTION

A. Al-Daoude, M. Jawhar, M.I.E. Arabi

Abstract


The fungus Cochliobolus sativus is the causal agent of Barley spot blotch (SB) disease. In order to better un- derstand barley physiological reaction towards this dis- ease, hydrogen peroxide (H2O2) and ion fluxes in two different genotypes inoculated with a virulent isolate of C. sativus were investigated. Results showed that SB de- velopment was directly dependent on H2O2 generation and accumulation during infection. Significant differ- ences (P<0.001) in H2O2 values were found among dif- ferent time points, with values being consistently higher in the resistant genotype. The interaction between host leaves and pathogen produced a marked increase in electrolyte leakage from the susceptible genotype com- pared with the resistant one. The information obtained from this study highlights crucial points that can guide hypothesis-driven research to elucidate the molecular mechanisms involved in C. sativus-barley interaction

Keywords


Cochliobolus sativus;barley;hydrogen peroxide;electrolyte leakage

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DOI: http://dx.doi.org/10.4454/JPP.V95I1.030

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