Abstract

LEYVA-MIR, Santos Gerardo; VILLASENOR-MIR, Héctor Eduardo; TOVAR-PEDRAZA, Juan Manuel  and  GARCIA-LEON, Elizabeth. Response of oat genotypes to infection by Bipolaris victoriae and Bipolaris sorokiniana. Rev. Mex. Cienc. Agríc [online]. 2019, vol.10, n.5, pp.1023-1034.  Epub Mar 03, 2020. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v10i5.1794.

The cultivation of oats (Avena sativa L.) is affected by a wide range of foliar diseases caused by pathogenic fungi, among these the most important are those induced by Bipolaris spp., which cause severe leaf blights, mainly in the area of High Valleys of Mexico. The objective of this study was to molecularly identify the two isolates associated with leaf blight in oats and determine the response of 30 commercial varieties of oats from the National Collection to infection by B. victoriae and B. sorokiniana under greenhouse conditions. An isolate of B. victoriae and an isolate of B. sorokiniana were increased to inoculate plants of 30 varieties of oats by spraying a suspension of spores onto the foliage. The experimental design used was in random blocks for each of the isolates, 30 treatments were evaluated, which consisted of the analyzed varieties, each treatment consisted of 20 plants with four repetitions. Leaf damage was measured as a response variable to determine the severity of the disease. It was observed that the varieties AB-177, Cuauhtémoc, Gema, Texas, Nodaway and Pampas behaved as the most susceptible to B. sorokiniana, while, the Teporaca and Nuda varieties showed to be moderately resistant to this pathogen. For the case of B. victoriae, it was observed that Juchitepec and Ópalo varieties were resistant, meanwhile, Gema, Bachiniva and Cevamex varieties behaved as the most susceptible to infection.

Keywords : Avena sativa; brands; resistance; severity.

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