Tarbiat Modares University Journal of Crop Protection 2251-9041 13 2 2024 06 01 Stability of quantitative resistance in wheat and barley to Fusarium head blight 169 178 1663 10.48311/jcp.2024.1663 EN Nachaat Sakr Department of Agriculture, Syrian Atomic Energy Commission, Damascus, P. O. Box: 6091, Syria. Journal Article <span>Wheat and barley can be infected with Fusarium head blight (FHB), reducing grain weight and quality. A number of studies have recognized the stability of </span><span>quantitative resistance (QR) within wheat and barley cultivars; however, the behaviour of QR may not be stable over different environments. </span><span>We have therefore evaluated QR stability in </span><span>diverse bread and durum wheat and barley cultivars</span><span> under artificial infection with a set of 16 fungal isolates of four Fusarium species with diverse pathogenicity. </span><span>Nine QR components were obtained under in vitro, growth camber, and field conditions, and they were used to describe the nature of QR stability </span><span>at the earliest and latest growth stages.</span><span> Analysis of the variance of bio-experiments revealed significant cultivar-isolate interactions. The seedling and adult plant results showed that Arabi Aswad (barley) and </span><span>Bohoth10 (bread wheat) were </span><span>ranked among the most FHB resistant,</span><span> whereas Acsad65 (durum) was the most affected cultivar. The reliability of the cultivar ranking was validated by the significant correlation among </span><span>the resistance measured by the nine resistance components on host cultivars. </span><span>QR </span><span>stability in cultivars to FHB infection was fulfilled over years as well as several experimental conditions, </span><span>suggesting that </span><span>QR of wheat and barley to Fusarium is mainly explained by major </span><span>quantitative trait loci </span><span>that confer resistance to all FHB isolates. The constancy of QR resistance ratings of cultivars is consistent with a hypothesis that wheat- and barley-</span><span>Fusarium</span><span> interactions for QR were of small value. The cultivars AS </span><span>and </span><span>Bohoth10 </span><span>showed remarkable and stable resistance in almost all tests and gave the lowest sensitivity rates; they could be very promising sources of genetic resistance to FHB in breeding programs and an alternative for farmers to Fusarium-sensitive cultivars.</span><br> https://jcp.modares.ac.ir/article_1663_e449b9317dad920c0dd5ad0a2a2d5e49.pdf