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 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.

普通豆是分布在世界各地的豆类作物。由于近几年单产较低，干豆生产遇到了越来越大的困难。茄根枯菌是引起该作物大部分经济损失的根和下胚轴病原体之一。控制植物病害的一种有前途的策略是使用生物控制剂，其能够减少病原体的负面影响并促进植物中的阳性反应。木霉属。是在土壤中普遍存在的真菌类，可以在土壤中或植物的任何地上部分生长。这项工作的目的是研究在有植物病原菌R. solani的情况下木霉对豆类植物生长的影响。，根据木霉分离来源（种子或土壤）。分析了从豆类种子和豆田土壤中收集的55种木霉分离株。其中，那些从土壤样品中分离表现出比从种子中分离的那些菌株更高的植物生长促进活性，在存在水稻纹枯病菌。此外，接种豆植物木霉-土壤分离株显示出发芽，下胚轴直径，根系统的长度，和地上部分的干重和根系统的比接种的植株的比例更高Trichoderma-种子分离物。