Resumo

QUERO-CARRILLO, Adrián Raymundo et al. Pathogenic fungi associated to commercial seed of mexican varieties of Bouteloua curtipendula. Rev. mex. fitopatol [online]. 2020, vol.38, n.2, pp.198-214.  Epub 27-Nov-2020. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.2002-4.

Plant seeds represent a main source for pathogen dissemination; in order to determine pathogens associated with propagules of five varieties of sideoats gramma: NdeM-La Zarca, NdeM-303, NdeM-5, NdeM-Zenith, NdeM-La resolana, three different kind of propagules were analyzed, from seed (spikelets) available from commercial production fields located at Valle del Mezquital, Hidalgo: spikelets (caryopsis + accessory bracts; M1), caryopsis + lemma (M2) and pure caryopsis (M3). Seed was harvested during 2017. In order to promote the expression of fungus growth already present on the propagule, spikelets (M1) were sown within a humidity chamber; while M2 and M3, sown on PDA culture media (five propagules per Petri dish, 60 dishes per variety); growth material was later sown on specific media for identification. Isolated results were identified through growth traits on culture media, morphology traits and molecular markers. Alternaria alternata y A. tenuissima was observed for 67% of the samples, Fusarium scirpi and F. incarnatum, at 24%, and Bipolaris cynodontis, in 9%. To date, none of these pathogenic species have been reported in Mexico for commercial seed of B. curtipendula. These findings open a wide spectrum for sanitary management of produced seed for this plant species.

Palavras-chave : sideoats gramma; seed health; seed quality.

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