期刊
BRAZILIAN JOURNAL OF MICROBIOLOGY
卷 46, 期 4, 页码 1093-1101出版社
SOC BRASILEIRA MICROBIOLOGIA
DOI: 10.1590/S1517-838246420120177
关键词
Macrophomina phaseolina; antagonism; hyperparasitism; Trichoderma
类别
资金
- Instituto Politecnico Nacional and Patronato para la Investigacion Fomento y Sanidad Vegetal A.C.
- COFAA scholarship
- EDI-IPN scholarship
Sampling of agricultural soils from the Mexican northeastern region was performed to detect Trichoderma spp., genetically characterize it, and assess its potential use as a biologic control agent against Macrophomina phaseolina. M. phaseolina is a phytopathogen that attacks over 500 species of cultivated plants and causes heavy losses in the regional sorghum crop. Sampling was performed immediately after sorghum or corn harvest in an area that was approximately 170 km from the Mexico-USA border. Sixteen isolates were obtained in total. Using colony morphology and sequencing the internal transcribed spacers (ITS) 1 and 4 of 18S rDNA, 14 strains were identified as Trichoderma harzianum, T. koningiopsis and T. virens. Subsequently, their antagonistic activity against M. phaseolina was evaluated in vitro, and 11 isolates showed antagonism by competition and stopped M. phaseolina growth. In 4 of these isolates, the antibiosis phenomenon was observed through the formation of an intermediate band without growth between colonies. One strain, HTE808, was identified as Trichoderma koningiopsis and grew rapidly; when it came into contact with the M. phaseolina colony, it continued to grow and sporulated until it covered the entire petri dish. Microscopic examination confirmed that it has a high level of hyperparasitism and is thus considered to have high potential for use in the control of this phytopathogen.
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