Antifungal activity and bean growth promotion of Trichoderma strains isolated from seed vs soil
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Antifungal activity and bean growth promotion of Trichoderma strains isolated from seed vs soil S. Mayo-Prieto & M. P. Campelo & A. Lorenzana & A. Rodríguez-González & B. Reinoso & S. Gutiérrez & P. A. Casquero
Accepted: 28 June 2020 # Koninklijke Nederlandse Planteziektenkundige Vereniging 2020
Abstract The common bean is a legume crop distributed worldwide. Dry bean production has gone through increasing difficulties due to relatively low yields in the last few years. Rhizoctonia solani is one of the root and hypocotyl pathogens that causes most of the economic losses in this crop. One promising strategy to control plant diseases is the use of biological control agents, able to reduce the negative effects of pathogens and to promote positive responses in the plant. Trichoderma spp. is a fungal genus ubiquitous in soil that can grow in soil or in any of the above ground parts of plants. The aims of this work were to study the effect of Trichoderma on bean plant growth, in the presence of the phytopathogen R. solani, according to the Trichoderma isolation source (seed or soil). Fifty-five Trichoderma isolates collected from bean seeds and from bean field soils were analyzed. Among them, those Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10658-020-02069-8) contains supplementary material, which is available to authorized users. S. Mayo-Prieto (*) : M. P. Campelo : A. Lorenzana : A. Rodríguez-González : B. Reinoso : P. A. Casquero Grupo Universitario de Investigación en Ingeniería y Agricultura Sostenible (GUIIAS), Instituto de Medio Ambiente, Recursos Naturales y Biodiversidad, Universidad de León, Avenida Portugal 41, 24071 León, Spain e-mail: [email protected] S. Gutiérrez Grupo Universitario de Investigación en Ingeniería y Agricultura Sostenible (GUIIAS), Área de Microbiología, Escuela de Ingeniería Agraria y Forestal, Universidad de León, Campus de Ponferrada, Avenida Astorga s/n, 24400 Ponferrada, Spain
isolated from soil samples showed a higher plant growth promotion activity than those strains isolated from seeds, in the presence of R. solani. Furthermore, bean plants inoculated with Trichoderma-soil isolates showed a higher percentage of germination, hypocotyl diameter, length of the root system, and dry weight of aerial parts and root system than plants inoculated with Trichoderma-seed isolates. Keywords Phaseolus vulgaris . Seed . Soil . Root rot . Biological control
Introduction The common bean (Phaseolus vulgaris L) is the third most important food legume crop worldwide dedicated to human consumption which is surpassed only by soybean (Glycine max (L.) Merr.) and peanut (Arachis hypogea L.). This crop is produced in all continents and is a source of proteins, vitamins, minerals, fiber and other compounds such as polyphenols that could prevent cardiovascular diseases or obesity. These health and environmental benefits have led to renewed interest in common bean cultivation in developed countries, where the increasing demand for healthy food drives far
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