Resumo

YANEZ JUAREZ, Moisés Gilberto et al. In vitro effect of potassium phosphite on Athelia rolfsii and Pythium aphanidermatum. Rev. Mex. Cienc. Agríc [online]. 2018, vol.9, n.7, pp.1532-1538.  Epub 30-Set-2020. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v9i7.286.

The objective of this study was to determine the in vitro effect of potassium phosphite on the radial growth of the mycelium, the production of biomass and the production of sclerotia of Athelia rolfsii and oospores of Pythium aphanidermatum. Doses of 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3 mL L-1 of potassium phosphite and an absolute control (without potassium phosphite) were evaluated using PDA culture medium and distilled water. The radial growth of mycelium decreased due to potassium phosphite, so at the end of the evaluation and comparing it with the control, the radial growth of P. aphanidermatum decreased from 16.9 to 53.2% and from 15 to 21.3% for A. rolfsii. At 96 h after sowing, biomass production by P. aphanidermatum and A. rolfsii decreased from 16.9 to 53.2% and 58.3 to 63.4%, respectively. After 72 h of sowing, the formation of oospores of P. aphanidermatum on distilled water with potassium phosphite was not observed, which did occur in the control after 24 h. At 22 days after sowing, A. rolfsii produced an average of 30.2 sclerotia, whereas in PDA with potassium phosphite it did not form sclerotia. This indicates that potassium phosphite is an effective substance to reduce mycelial growth, the production of biomass, and inhibits the formation of oospores of P. aphanidermatum and of sclerotia of A. rolfsii.

Palavras-chave : biomass production; mycelial growth; oospore formation; sclerotia formation.

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