Science and Technology Production
Seminario Científico franco-argentino sobre Agroecología - Programa ARFAGRI - Analysis of the effect of autochthonous isolates of Streptomyces spp. on growth, development and plant protection in soybean
Congreso
Authorship:
Villafañe, David L. ; MALDONADO, RODRIGO AGUSTÍN ; Gramajo, Hugo ; Chiesa, M. Amalia ; Rodríguez, EduardoDate:
2022Publishing House and Editing Place:
ARFAGRISummary *
Currently, the development of sustainable and eco-friendly strategies to reduce the intensive use ofagrochemicals in crop production is essential. The utilization of soil beneficial microbes as plantgrowth-promoters and biocontrol agents has been proved to be one of the main alternatives. In thiswork, seventy-eight actinobacteria belonging mainly to the genus Streptomyces were isolated fromthe rhizosphere of soybean plants from the core productive zone of Argentina. Particularly, twostrains were selected based on their compatibility with Bradyrhizobium japonicum, their ability toproduce phytohormones, siderophores and solubilize phosphate and their antagonism to differentfungal pathogens, in vitro. Then, the effect of adding these selected Streptomyces strains on growthand development at different stages of soybean plants and their effect on plant protection, wastested. As results, plant growth and development promotion were evidenced. The percentage of seedgermination and seedlings emergence were higher in non-sterile soil compared to the non-treatedcontrol and the antifungal (AF) treatment (P<0.05). Moreover, leaf area, the number of nodes andbranches, and dried weight of aerial parts and roots, were significatively greater in treatments withStreptomyces strains (P<0.05) when compared to the conventional AF treatment, in assays undergreenhouse conditions. Then, the bacterial effect as growth promoters was tested in field trials. Inaddition, their biocontrol capacity was tested against the fungal pathogens Diaporthe aspalathi andMacrophomina phaseolina, showing a marked delay in the symptom’s development and asignificant decrease in the percentage of dead plants (P<0.05), compared to the non-treated controland also the AF treatment. Thus, we demonstrated that the isolated actinobacteria promote growthand development of soybean plants, and also enhance the defense status in the tested conditions. Information provided by the agent in SIGEVAKey Words
StreptomycesCropAgrochemicalsSoybean