EVALUATION OF THE YIELD COMPONENTS USING NOVEL Bacillus STRAINS ISOLATED OF WHEAT (Triticum aestivum) RHIZOSPHERE

BARENGO, PAMELA B.; OLIVELLA, LAURA; TROD, B.; FIGUEROA, SOL A.; ESPARIZ, MARTIN; DAURELIO, LUCAS D.

Chapadmalal

Congreso; XVIII Congreso de la Sociedad Argentina de Microbiología General (SAMIGE).; 2023

SAMIGE

Wheat is the main produced wintry crop in our country. The rhizosphere associated with wheat plants supports a vastly diversified microbial community, including microorganisms capable of regulating the development and activity of plants, with potential impact in the yield improvement in crops. Previously, a novel group of Bacillus strains were isolated from the wheat rhizosphere, some of which, used individually, demonstrated the ability to promote plant growth (PGP), including an enhancement of yield. The aim of this work was to evaluate the response of wheat against different treatments with B. velezensis ZAV-W70 and B. megaterium ZAV-W64 as plant growth-promoting rhizobacteria (PGPR). For the test, field plots, 3 m wide by 5 m long, were planted at 17.5 cm row spacing. Planting was carried out in July 2023, a short-cycle variety was used. Measurements were made in the central grooves. The treatments were: T1: commercial fungicide (F), T2: F+ZAV-W64, T3: F+PGPR commercial Azospirillum, T4: F+ZAV-W70, T5: F+ZAV-W64+ZAV-W70, T6: ZAVW64, T7: ZAV-W70, T8: distilled water, T9: ZAV-W64-ZAV-W70, T10: untreated seeds. At physiological maturity, the following parameters were determined: a) crop yield (kg.ha-1); b) number of spikes per m2 (SN) and c) thousand-seed weight (W1000). Statistical analysis was performed using InfoStat ® software. The effects of the treatments were evaluated by means of ANOVA and the comparison of means by LSD Test, with a significance level of 5%. These results showed that the yield of the crop, with or without fungicide, was higher in the treatments with the incorporation of PGPR, without differences between strains. The treatments T3 and T4 shows significative differences with respect to yield and the number of spikes per m2 (T3: 3405 kg.ha-1 and 503 SN m-2 *, T4: 3261 kg.ha-1 and 421 SN m-2). The application of the Bacillus strains promoted the development of the plants and improved the yield. These results suggest that the studied bacteria possess PGP ability. To enrich the knowledge about PGP influence on the wheat crop, they will be tested under different abiotic and biotic stress conditions.