SOLUBILIZAÇÃO DE FOSFATOS E PRODUÇÃO DE ÁCIDO INDOL-3-ACÉTICO, POR MICRO-ORGANISMOS ENDOFÍTICOS RADICULARES E RIZOSFÉRICOS DE Hymenaea Coubaril L.

Abstract

The Cerrado is considered the 2nd largest biome in extension, occupying an area of 2,036,448 km2, is a cradle of large river basins and has a great floristic diversity. It is considered an important conservation hotspots in Brazil and is still threatened by agricultural expansion. The conservation and use of native species are of great importance in the use in reforestation projects, recovery of degraded areas, human food, agriculture, among others; Therefore, knowing relationships between plant species and microorganisms is promising for understanding how these adaptations developed. Endophytic and rhizospheric microorganisms are considered determinant in the development of their hosts, assisting in the absorption of nutrients and plant physiology. They are also linked in the secretion of organic compounds and are closely involved in promoting plant growth. In this sense, this work aimed to investigate functional and endophytic and rhizospheric microorganisms of Hymenaea coubaril. Root and soil samples were collected in the Cerrado. In total there were 21 bacterial isolates and 21 fungal isolates, which have potential for solubilization of CaHPO4, AlPO4 and FePO4, indole acetic acid (IAA) production. The bacterial isolates that HSCB1, HSCB8 and HSCB10, showed satisfactory results in phosphate solubilization tests and IAA production. The fungal isolates HSCF5, HSCF13 and HSCF14, showed results ranging from “strong to “very strong” when submitted to the same tests. It can be concluded that root and rhizospheric endophytic microorganisms isolated from Jatobá do Cerrado have great potential for phosphate solubilization and IAA production in vitro, raising perspectives for field tests.