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In order to categorize and evaluate resistance to Rhizoctonia disease, 31 Pollinator lines along with two resistant controls (Novodro and line SB-709) and one sensitive control (191) were evaluated in the microplot conditions in Hamedan in 2023. Two months after cultivation, Rhizoctonia solani isolate ( Rh133) was used to create an artificial inoculum. Results showed that the average number of roots, disease index (DI), and harvest index (HI) for the investigated genetic populations were 17.87, 5.00, and 26.96, respectively. Pollinators 16 (S1-010259), 7 (S1-010242), 17 (S1-010261), and 31 (S1-010287) obtained higher harvest indexes and lower disease indexes than other genotypes. Also, the mentioned lines obtained the highest SIIG index and were the closest to the ideal lines. Based on the cluster analysis results, pollinators 16 (S1-010259), 17 (S1-010261), 7 (S1-010242), and 22 (S1-010270) were grouped together. This group exhibited a significantly lower disease index, a higher harvest index, and an SIIG index closer to one. According to the results of biplot analysis, pollinators 16 (S1-010259), 17 (S1-010261), 19 (S1-010264), and 31 (S1-010287) were found in a region of the biplot that exhibited a high harvest index, SIIG index, and low disease index. Finally, Lines 16 (S1-010259), 17 (S1-010261), 19 (S1-010264), and 31 (S1-010287) have been identified as resilient pollinators for future breeding programs.
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