Abstract
ABSTRACT Alternaria sp. is a fungus that causes rot in several crops, causing damage to the agricultural production chain. Biological control agents constitute an alternative to reduce the use of pesticides in the crops, a social demand for modern agriculture. The aim of the present study is to demonstrate the antagonistic effect of the yeast Trichosporon asahii (3S44) on the mycelial development of Alternaria sp. and some in vitro mechanisms of action. Trichosporon asahii showed antagonistic activity towards Alternaria sp., presenting mycelial inhibition (57.47%). The assays indicated production of volatile organic compounds (VOCs), competition for nutrients, biofilm formation, production of killer toxins and β-1,3-glucanase as mechanisms of action of T. asahii. Collectively, our results showed the potential of T. asahii to control the mycelial development of Alternaria sp. and some mechanisms of action of this yeast for future biotechnological studies.
Highlights
Alternaria sp. é um fungo que causa podridão em diferentes culturas agrícolas, causando danos a cadeia de produção
The aim of the present study is to demonstrate the antagonistic effect of the yeast Trichosporon asahii (3S44) on the mycelial development of Alternaria sp. and some in vitro mechanisms of action
Production of volatile organic compounds (VOCs) The mycelial area of Alternaria sp. was inhibited in the presence of VOCs produced by T. asahii (Figure 2)
Summary
Alternaria sp. é um fungo que causa podridão em diferentes culturas agrícolas, causando danos a cadeia de produção. O objetivo deste trabalho é demonstrar o efeito antagônico da levedura Trichosporon asahii (3S44) no desenvolvimento micelial de Alternaria sp. Os ensaios indicaram a produção de compostos orgânicos voláteis (COVs), competição por nutrientes, formação de biofilme, produção de toxina killer e β-1,3-glucanase como mecanismos de ação de T. asahii. Coletivamente, os resultados demonstraram o potencial de T. asahii no controle do desenvolvimento micelial de Alternaria sp. Some Alternaria species are pathogens of plants of agricultural importance, causing economic impact on several crops such as cereals, ornamental plants, broccoli, cauliflowers, potatoes, carrots, tomatoes, citruses and apples [24]. Microorganisms can use several mechanisms to antagonize fungi that cause crop damage, such as competition for nutrients and space, production of volatile compounds [19, 21], production of killer toxins and hydrolytic enzymes [19], and formation of biofilm [5]
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