Bioprospection of yeasts as biocontrol agents against phytopathogenic molds

Abstract

Yeasts isolated from sugar cane and maize rhizosphere, leaves and stalks were screened against the phytopathogenic molds Colletotrichum sublineolum and Colletotrichum graminicola, both causal agents of the anthracnose disease in sorghum and maize, respectively. Strains identified as Torulaspora globosa and Candida intermedia were able to inhibit the mold growth, with the first species also exhibiting killer activity. No previous report on the application and potentiality of these yeasts as biocontrol agents were found neither the killer phenotype in Torulaspora globosa.

Release of potassium from rock powder by the yeast Torulaspora globosa

“…The inoculation of this species in different cultures in the field has resulted in a significant increase in the productivity of the inoculated cultures when compared to that of the non-inoculated ones. In this context, the aim of this work was to evaluate the biosolubilization of the alkaline ultramafic rock for potassium release by a strain of the yeast Torulaspora globosa, isolated from the rhizosphere of sugar cane, that possesses the potential to be a biological control agent Rosa-Magri et al 2011).…”

Antifungal activity of native yeasts from different microenvironments against Colletotrichum gloeosporioides on ripe olive fruits

“…Most of the selection techniques of biocontrol agents are based on detection of antifungal diffusible metabolites (antibiosis) in dual culture, determining inhibition of vegetative fungal growth (Balouiri et al, 2016;Capdeville et al, 2007;Chanchaichaovivat et al, 2007;El-Tarabily and Sivasithamparam, 2006;Landum et al, 2016;Lima et al, 2012;Nally et al, 2012;Rosa-Magri et al, 2011). However, other researchers consider competition for nutrients and space the most important mode of action of antagonistic yeasts against fungal pathogens (Droby et al, 1989;Spadaro and Droby, 2016).…”

Mecanismos de ação de isolados de leveduras envolvidos no biocontrole de Penicillium digitatum, agente causal do bolor verde em frutos cítricos

“…Apesar do conhecimento sobre algumas funções das leveduras no ambiente, muito ainda há para ser descoberto, principalmente sobre os seus mecanismos de ação (Rosa-Magri et al, 2011). Algumas espécies de leveduras produzem enzimas hidrolíticas tais como β -glucanases e quitinases, que destroem as paredes celulares de outros fungos (Saligkarias et al, 2002).…”