Maize insensitivity to culture filtrates from Exserohilum turcicum is related to quantitative resistance

• DOI: 10.1111/jph.13350
• Publication Date: 2024-08-01T09:44:53Z
• Authors: Carlos Muñoz‐Zavala; Paul H. Goodwin; Santos G. Leyva‐Mir; Alexander Loladze; Mateo Vargas‐Hern...; Elizabeth García‐...; Juan M. Tovar‐Ped...; Félix M. San Vice...; Amos Alakonya
• Keywords: Exserohilum

Abstract Turcicum leaf blight (TLB) of maize is caused by Exserohilum turcicum . The TLB resistance mainly associated with qualitative race‐specific that linked to several Ht genes namely Ht1 , Ht2 Ht3 HtM HtN HtNB and HtP However, quantitative also occurs, but its mechanisms are poorly understood. In this study, tolerance or insensitivity chlorosis necrosis E culture filtrate was resistance. A novel detached seedling assay developed for using methanol‐treated modified Fries medium. Screening isolates races 2, 3, 23, 3 N, 23 N 123 against 61 inbred lines diverse levels conducted in the greenhouse fungal inoculation assay. Using an isolate race which can overcome all genes, a simple linear regression model ( R 2 = 0.68, p .90) established between disease severity from foliar inoculations symptom rating Two CML474 CML483 had relatively high ratings very low indicating these sources may be unrelated filtrates, whose effect on seedlings could due toxin known as HT‐toxin monocerin.