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Due to its adsorption with aluminum and iron hydroxides, phosphorus viability is low in acidic soils; thus, the aim of this study was to isolate and identify bacteria from the rhizosphere of four legumes growing in acidic soils of the Cumbaza Sub-basin, San Martín, Peru, as well as to characterize their ability to solubilize aluminum phosphate and iron phosphate. The isolation process was conducted on TSA medium and the isolates were classified based on their origin and morphocolonial characteristics, with the bacillary shape being the most frequent, followed by cocci. To assess the solubilization of aluminum and iron phosphates, the liquid medium GELP was employed. Sixteen strains were selected, among which three stood out for their effectiveness in solubilizing AlPO4 (Sfcv-098-02, 22.65 mg L−1; Sfc-093-04, 26.50 mg L−1; and Sfcv-041-01-2, 55.98 mg L−1) and one for its ability to solubilize FePO4 (Sfcr-043-02, 32.61 mg L−1). These four strains were molecularly characterized, being identified as Enterobacter sp., Pseudomonas sp., and Staphylococcus sp. Additionally, a decrease in pH was observed in the reactions, with values ranging from 5.23 to 3.29, which enhanced the phosphate of solubilization. This suggests that the selected bacteria could be used to improve phosphorus availability in agricultural soils. [ABSTRACT FROM AUTHOR]

Burkholderia vietnamiensis is a diazotroph capable of producing siderophores, as well as colonizing the rhizosphere and endosphere of rice. Although its taxonomy is not completely resolved, more isolations are needed to clarify the phylogenetic relationships with other species. The present work sought to implement a collection of phytobeneficial Burkholderia strains associated with different rice cultivars in the Peruvian jungle in order to carry out comparative genomics studies. 211 root endophytic bacteria were isolated and selected according to their ability to fix atmospheric nitrogen and production of siderophores, subsequently, molecular discrimination was carried out by amplifying the recA housekeeping gene. Only 16.1% of the isolates were able to produce siderophores and fix atmospheric nitrogen, using a specific primer for the genus Burkholderia (recA), the presence of at least 4 strains of Burkholderia was determined. The percentages of similarity in the recA gene varied between 98.36 to 99.51(%) with respect to the type strain. It is concluded that B. vietnamiensis would present growthpromoting characteristics due to its ability to fix nitrogen and siderophores and constitutes a potential Inoculant resource. This work has been financed by PROCIENCIA- CONCYTEC, through Contract 062- 2021-FONDECYT. [ABSTRACT FROM AUTHOR]