STRAINS OF Paraburkholderia ORIGINATED FROM RUPESTRIAN FIELDS PROMOTE THE GROWTH OF Mimosa foliolosa

Abstract

Mimosa foliolosa is a promising native species of rupestrian fields for revegetation of degraded areas in this ecosystem. The symbiosis between leguminous plants and N2-fixing bacteria may play an important role in the recovery of these areas, since these plants have better development and are more resistant to the attack of pathogens. In addition to the biological nitrogen fixation (BNF), these bacteria can promote plant growth through other processes, such as phosphate solubilization and siderophore production. We studied the cultural and genetic characteristics of 11 bacterial strains, isolated from rupestrian field soils using Mimosa tenuiflora as “trap” plant. We evaluated these strains considering their symbiotic characteristics such as nodulation, and growth-promotion of Mimosa foliolosa, as well as their ability for siderophore production and phosphate solubilization. Native N2-fixing bacterial strains belonging to the Paraburkholderia genus (UFLA01-750, UFLA01-728, UFLA01-725, and UFLA01-757), showed high symbiotic efficiency with M. foliolosa. These strains also solubilized calcium phosphate and produced siderophores, exhibiting high functional diversity and potential for use in revegetation projects.

Endophytic bacteria promote growth and increase the aloin content of Aloe vera

“…isolate, associated previously with the solubilization of Bayóvar phosphate and antibiosis to Fusarium sp., was efficient in promoting the growth of the A. vera plants, inducing leaf production and a greater accumulation of fresh biomass in the leaves and biomass in the roots. Paraburkholderia species have already been shown to promote growth in a number of other plants (Bolívar-Anillo et al, 2016;Huo et al, 2018;Zhou et al, 2018;Kuramae et al, 2020;García et al, 2020;Souza et al, 2020;Herpell et al, 2020). These bacteria are known to fix nitrogen (De Meyer et al, 2018;Tapia-García et al, 2020;Paulitsch et al, 2020), solubilize phosphate, and have antifungal activity (Bernabeu et al, 2018;Gao et al, 2018b;Hye-Jin & Min-Ho, 2019).…”