Bactérias endofíticas de plântulas de tomateiro como inibidoras de crescimento de Alternaria sp

Abstract

In the control of the phytopathogenic fungus Alternaria sp., the application of fungicide is the most used control method, which can generate negative consequences for the environment. To obtain a more sustainable approach, the present work evaluated the antagonistic potential of endophytic bacteria isolated from tomato seedlings of the cultivars Cereja, Rasteiro Rio Grande and Híbrido Chapolin on the mycelial growth of the pathogenic fungus Alternaria sp. “in vitro”. The experimental design used was completely randomized, consisting of the cultivation of an isolate of the phytopathogenic fungus Alternaria sp. in 13 treatments (Control and 12 previously selected bacterial isolates) with four replications. In relation to the control, the inhibition rate of mycelial diameter ranged from 29.8 to 64.2% and the growth rate from 33.7 to 72.4% in the presence of endophytic bacteria, with emphasis on CB3 isolates (Bacillus siamensis KCTC 13613) and RB10T (Bacillus velezensis CR-502). The endophytic bacteria isolated from the tomato plant Cereja and Rasteiro Rio Grande have inhibition potential against the phytopathogenic fungus Alternaria sp. and can be an ecological and future alternative for use in biological control.