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

Mariana Gonçalves Souza,Fatima Maria De Souza Moreira,Silvia Maria De Oliveira-Longatti,Fernanda De Carvalho,Leonardo Paiva Barbosa

doi:10.1590/1806-908820200000012

Mariana Gonçalves Souza, Fatima Maria De Souza Moreira + Show 3 more

Open Access

https://doi.org/10.1590/1806-908820200000012

Copy DOI

Abstract

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.

Highlights

Rupestrian fields are known for the high diversity of plant and animal species that inhabit them, many of which are endemic
Symbiosis between leguminous plants and Nodulating Bacteria may play an important role in processes for recovery of these areas, since these plants have better development and are more resistant to attack from pathogens (Martins et al, 2018; Ferreira et al, 2020)
The multifunctionality of this group of microorganisms is well-known, i.e., in addition to biological nitrogen fixation (BNF), these bacteria can promote plant growth through other processes, such as phosphate solubilization (Marra et al, 2012), which results in an increase in the supply of phosphorus available for uptake by plants, and siderophore production, which makes iron available for plant growth through the iron/siderophore bacterial complex and limits iron acquisition by plant pathogens, preventing their proliferation in this ecological niche (Neilands, 1952; Neilands, 1995)

Summary

Introduction

Rupestrian fields are known for the high diversity of plant and animal species that inhabit them, many of which are endemic. Through improving soil fertility, they may favor the growth of other non-leguminous species (Zotarelli et al, 2012). The multifunctionality of this group of microorganisms is well-known, i.e., in addition to biological nitrogen fixation (BNF), these bacteria can promote plant growth through other processes, such as phosphate solubilization (Marra et al, 2012), which results in an increase in the supply of phosphorus available for uptake by plants, and siderophore production, which makes iron available for plant growth through the iron/siderophore bacterial complex and limits iron acquisition by plant pathogens, preventing their proliferation in this ecological niche (Neilands, 1952; Neilands, 1995). We evaluated the strains regarding their nodulation- and growth-promoting ability in Mimosa foliolosa (a leguminous plant species endemic to the rupestrian fields), as well as their ability for siderophore production and phosphate solubilization

Methods

Results

Discussion

Conclusion