Initial development of upland rice plants inoculated with the MAY12 strain of Azospirillum spp.

Abstract

The purpose of this study was to evaluate the contribution of the inoculation of the strain Azospirillum MAY12 to the development of rice plants of the cultivar BRS Esmeralda. A completely randomized experiment was performed in a greenhouse, with 8 treatments and 6 repetitions, namely, commercial inoculant (CI) containing strains of Azospirillum brasilense ABV5 and ABV6 (T1), MAY12 (T2), nitrogen control with 50 mg of N or full dose (T3), CI + 30% of N (percentage referring to full dose) (T4), CI + 60% N (T5), MAY12 + 30% N (T6), MAY12 + 60% N (T7) and absolute control (T8). There was a significant increase in the fresh and dry mass of the shoot and roots, height, root volume, and the number of tillers and leaves of plants with the MAY12 inoculation (with and without N added) compared to T8. Treatments containing MAY12 + N increased the total dry mass by ~920% compared to T8, matching the T3 yield. The inoculation of MAY12 in isolation was as efficient as the application of the full dose of N, resulting in an increase of ~115% in height and 373% in root volume of the plants compared to T8. The MAY12 strain demonstrated good performance in the development of the cultivar, which was comparable to the CI in the variables tested. Therefore, inoculation with the MAY12 strain is promising for the partial reduction of nitrogen fertilizers in upland rice cultivation.

Effect of inoculation of corn seeds with azospirillum brasilense on grain and silage production

“…Among the growth-promoting bacteria those of the genus Azospirillum are found in different environments and population densities (CASSAN et al 2014;ALMEIDA et al 2021). Beneficial effects of inoculation with Azospirillum include a higher percentage of seed germination, increased vigor plant and higher development of the root system (BRASIL et al 2021). These effects are directly linked to the availability of nitrogen as well as to the production of phytohormones, which are able to change the morphology of the plant providing a more efficient use of resources maximizing the absorption of nutrients due to the greater number of radicelles and the increase in diameter of absorbent roots (SKONIESKI et al 2019).…”