PLANT GROWTH AND RESISTANCE PROMOTED BY STREPTOMYCES SPP. IN THE MODEL ORGANISM ARABIDOPSIS THALIANA

VERÓNICA VALLEJO; DAVID VILLAFAÑE; EDUARDO JOSE RODRIGUEZ; PAULA CASATI

Congreso; Congreso SAIB 2022; 2022

Rhizobacteria, so called due to their association with roots in the rhizosphere, play a very important rolein plant growth promotion and protection by controlling or inhibiting pathogens. Actinomycetes is one ofthe major components of rhizosphere microbial populations. As part of this group, Streptomyces spp. areGram-positive filamentous prokaryotes, ubiquitous in soils. Many rhizobacteria have a beneficial effecton plant growth and development, showing at least two of the three following criteria: competitively rootcolonization, stimulation of growth and reduction of disease incidence. In recent years, the use ofStreptomyces has become an attractive tool for crop disease management, being considered as acomponent for sustainable agriculture. Previously, we have isolated two Streptomyces spp. from thesoybean-rhizosphere that showed protection and promoted growth of soybean plants. Here, this studyaimed (i) to analyze isolates Streptomyces spp. as growth promoter for Arabidopsis thaliana wild type(Col-0 ecotype) plants and (ii) to study protection of Streptomyces spp. against the attack of thepathogen Pseudomonas syringae in the model organism Arabidopsis thaliana wild type (Col-0 ecotype).Our results demonstrate that treatment with either Streptomyces sp. promoted plant growth anddevelopment, and also increased seed production per plant, showing higher yield under greenhouseconditions. Moreover, the results obtained demonstrate that, in A. thaliana , plants treated with each ofthese two Streptomyces species showed increased resistance against Pseudomonas syringae infection.Altogether, these results provide evidence that Streptomyces spp. from soybean rhizosphere could beconsidered as possible biocontrol agents against phytopathogenic microorganisms and also stimulatinggrowth and development in other plants.