Salicylic acid and hydrogen peroxide accumulation in relation to hydrolyte leakage in barley plants challenged with Cochliobolus sativus

Al-Daoude, A. and Al-Shehadah, E. and Shoaib, A. and Jawhar, M. and Arabi, M.I.E. (2018) Salicylic acid and hydrogen peroxide accumulation in relation to hydrolyte leakage in barley plants challenged with Cochliobolus sativus. Cereal Research Communications, 46 (4). pp. 650-657. ISSN 0133-3720

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Abstract

Spot blotch (SB) caused by the hemibiotrophic fungal pathogen Cochliobolus sativus is a destructive disease of barley worldwide. To better understand the mechanisms of resistance to this disease, the involvements of salicylic acid (SA), hydrogen peroxide (H₂O₂) and ion fluxes during the interaction between resistant and susceptible barley seedlings and C. sativus were investigated. Early SA accumulation in leaf tissues was accompanied with an increase in H₂O₂ concentration in both compatible and incompatible interactions. The resistant cultivar constitutively contained higher levels of H₂O₂ and SA, as well as during the 72 h as compared with the un-infected control (0 h). However, levels increased rapidly upon infection in both cultivars. Moreover, a markedly greater increase in ion fluxes from the compatible material compared with the incompatible one was observed. Results suggest that SA and H₂O₂ accumulation are important during both compatible and incompatible barley- C. sativus interactions.

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