Spot blotch tolerance in barley is associated with early accumulation of hydrogen peroxide and jasmonic acid in leaves


A. Aldaoude*, M. Jawhar, Al-Shehadah, A. Shoaib

Volume 28, Issue 4;
Pages: 340-344; 2022
ISSN: 2069-0053 (print) (former ISSN: 1453-1399), Agroprint;
ISSN (online): 2068-9551


Spot blotch (SB), caused by the fungus Cochliobolus sativus, is an economically important disease of barley worldwide. Barley plants combat SB infection by eliciting a wide array of signaling pathways. To understand barley defense mechanisms towards this disease, the involvement of hydrogen peroxide (H2O2) and Jasmonic acid (JA) in tolerant ‘Banteng’ and susceptible ‘WI2291’ cultivars at early points of infection with the virulent C. sativus pathotype Pt4 was investigated. Data showed increasing accumulation of H2O2 and JA 24 hours post inoculation (hpi) as compared with the non-inoculated controls.  It is noteworthy that JA signaling was activated in parallel with H2O2 signaling up to 48h and then decreased at 72h in both cultivars. However, data revealed higher levels of H2O2  (0.92 µmol/g FW) in the tolerant cv. ‘Banteng’ as compared with the susceptible one ‘WI2291’ (0.33 µmol/g FW) 72hpi. The obtained results suggest that H2O2 and JA accumulation might have important role during barley - C. sativus interaction.

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