Streptomyces spp. treatment increases soybean yield and seed quality under field conditions.

VILLAFAÑES, D; MALDONADO, R; BIANCHI, J; RODRIGUEZ, E; CHIESA, M.A.

Viena

Conferencia; World Soybean Research Conference (WSRC) 11; 2023

Nowadays the development of sustainable and environmentally-friendly strategies using soil beneficial microbes as plant growth-promoting rhizobacteria (PGPR) and biocontrol agents (BCA) is gaining great consideration to reduce the use of agrochemicals in crops production. Considering the above, 78 actinobacteria from the genus Streptomyces were isolated from the rhizosphere and endosphere of soybean plants from the Argentinean core production zone. Among these, two strains (N2A and N9) were selected based on their in vitro compatibility with Bradyrhizobium japonicum (B), their ability to produce phytohormones, siderophores, phosphate solubilization and their antagonism to fungal pathogens. These strains were evaluated during 2021/22 growing season to analyze their effect as PGPR under field conditions. The treatments were N2A+B, N9+B, fungicide (F+B) and control (B). The assay was performed following a completely randomized block design at the experimental field (Agronomy Faculty-Zavalla, Santa Fe, Argentina). As results, Streptomyces spp. treatments significantly promoted seedlings emergence compared to B and F+B. At harvest, both Streptomyces strains significantly increased seed yield (g/m2) compare to the conventional agronomical practice (F+B), and N2A+B also showed higher yields than B (P