Resistance and tolerance reactions of barley doubled haploid lines to common root rot pathogen (Cochliobolus sativus)


M. Jawhar, E. Al-Shehadah

Volume 28, Issue 4;
Pages: 370-374; 2022
ISSN: 2069-0053 (print) (former ISSN: 1453-1399), Agroprint;
ISSN (online): 2068-9551


Common root rot (CRR), caused by the fungal pathogen Cochliobolus sativus, is an important disease of barley worldwide. The current CRR rating scale does not sufficiently represent a cultivar’s true performance, as it neglects tolerance of the cultivar. Since, resistance reflects the ability of a plant to restrict the pathogen infection, or inhibition pathogen growth throughout the plant, whereas, tolerance is the ability of the plant to yield, despite being infected. Therefore, a more informative CRR rating system is required to address this issue. Keeping in view this objective, two doubled haploid (DH) populations were tested in this investigation using both resistance and tolerance strategies. Results demonstrated significant differences among DH lines with a broad spectrum of disease responses ranging from high to low levels based on the percentage of subcrown internode discoloration rating scale. However, even though B08-AS-2 had a high CRR infection level (77.4%), it had a highest grain yield per plant (15.5g), similarly with B08-AS-4, 7 and 18 lines. However, the most resistant lines B08-AS-12 and 16 did not give a high yield. Furthermore, the correlation between resistance and tolerance to CRR was r =0.17, P<0.01, indicating that reaction of barley genotypes to this disease should therefore consider not only the resistance rating of a line, but also its tolerance which can reflect a genotype’s true performance.

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