Relationship between resistance and tolerance responses of barley DH lines to Pyrenophora graminea


Al-Shehadah E., Arabi M.I.E., Jawhar M.


Volume 30, Issue 1;
Pages: 35-39; 2024
ISSN: 2069-0053 (print), Agroprint;
ISSN (online): 2068-9551


Barley leaf stripe (BLS), caused by the fungus Pyrenophora graminea, is an important seed-borne disease that causes substantial crop yield losses globally. The recent BLS score scale does not adequately reflect a cultivar’s true performance, as it neglects its tolerance. Since, resistance reveals the ability of a plant to reduce the extent of pathogen infection, whereas, tolerance is the plant’s ability to yield, in spite of being infected. Consequently, a more informative BLS score system is essential to address this issue. For this goal, 40 doubled haploid (DH) lines were tested in this work using both resistance and tolerance traits. Data showed significant differences among DH lines with a wide spectrum of disease responses ranging from high to low levels based on the percentage of leaf infected rating scale. However, even though B08-AS-3 genotype had a high BLS infection level (94 %), it had a moderate grain yield per plant (7.8g), similarly with B08-AS-11, 15 and 18 lines. Furthermore, the most resistant lines B08- AS-5 and 12 did not give a high yield. A correlation (r =0.59, P<0.01) was found between resistance and tolerance, indicating that the 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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