Phenotypic reaction of wheat genotypes to blast and sporulation of Pyricularia oryzae Triticum.
2025
SILVA, D. da | MOSSOLIN, M. | MACIEL, J. L. N. | DEUNER, C. C. | DANIELA DA SILVA, UNIVERSITY OF PASSO FUNDO; MATEUS MOSSOLIN, FEDERAL INSTITUTE OF RIO GRANDE DO SUL; JOAO LEODATO NUNES MACIEL, CNPT; CAROLINA CARDOSO DEUNER, UNIVERSITY OF PASSO FUNDO.
Wheat blast, caused by Pyricularia oryzae Triticum (PoT), is one of the most destructive diseases of wheat. This study aimed to evaluate the phenotypic reaction to PoT in leaves and heads of plants of eight cultivars and 16 wheat lines and to evaluate the production of conidia in the rachis. The genotypes were inoculated at Zadoks stages 13 and 65 with PoT (105 conidia mL−1), and the disease severity was evaluated at 5, 7 and 11 days after inoculation. The severity values were used to calculate the area under the disease progress curve (AUDPC). Rachis samples were collected to evaluate PoT sporulation. Symptoms of blast and PoT sporulation occurred in all genotypes. Seven genotypes showed increased resistance to blast in leaves: PF 190018, ORS Feroz, ORS Absoluto, TBIO Aton, UB 2016605, TBIO Duque and GD 150534. ORS Feroz and PF 190018 also showed increased head resistence, along with IPF 86775, PF 180135, IPF 86749 and PF 160660. Genotypes with decreased sporulation included PF 160660, IPF 86775, PF 180135, ORS Feroz, IPF 86749 and TBIO Duque. These findings will help breeders and farmers identify and select blast-resistant cultivars.
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