Abstract

MATA-SANTOYO, Cassandra Itzel et al. Aggressiveness of Bipolaris sorokiniana and Alternaria alternata isolates on wheat cultivars in Mexico. Rev. mex. fitopatol [online]. 2018, vol.36, n.3, pp.432-443. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1803-3.

From samples of wheat cultivar CIRNO C2008 with leaf blight symptoms from southern Sonora, four isolates of Bipolaris sorokiniana and Alternaria alternata were obtained. The fungal species were identified by morphological characterization and ITS sequence analysis of rDNA. Thirteen bread wheat (Triticum aestivum) and 6 durum wheat (Triticum durum) cultivars were inoculated with the eight fungal isolates under greenhouse conditions. The aggressiveness of the isolates was assessed using a severity scale of 1 to 9, with 1 being minimal lesions and 9 being necrosis and generalized chlorosis indicating susceptibility. Cultivars Vicam S70, Kronstad F2004, and Río Bravo C2016 were moderately resistant to B. sorokiniana; while Bárcenas S2002, Morocco, Borlaug 100 F2014, Bacanora T88, Luminaria F2012, the advanced line C, Villa Juárez F2009, Maya S2007, Urbina S2007, PBW343, Nana F2007, Local Red, Noio and JC advanced line were highly susceptible. Additionally, it was observed that A. alternata is a secondary pathogen that invades the lesions caused by B. sorokiniana.

Keywords : leaf blight; spot blotch; pathogenicity; severity.

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