THE POTENTIAL OF PHOSPHATE SOLUBILIZING AND PLANT GROWTH PROMOTERS OF Burkholderia territorii EF. NAP 1 ISOLATED FROM ACID SOILS FOR THE CONSERVATION OF FORMERLY RUBBER PLANTATION LAND

Abstract

Phosphorus (P) is an essential element needed by plants. The presence of phosphorus in the environment, especially soil in the form of bound phosphates. This condition can be affected by the acidity of the soil. Available phosphates can be released by phosphate solubilizing bacteria. EF.NAP 1 isolate is a phosphate-solubilizing bacteria that has been successfully isolated from acid soil in the area of the Institut Teknologi Sumatera (ITERA), Lampung, Indonesia, and potency as plant growth-promoting bacteria (PGPB). Based on the results of identification using the 16S rRNA gene, EF.NAP 1 isolates has similarities with Burkholderia territorii. These isolates were able to dissolve phosphate of 104.7 mg/L. P dissolution correlates with the growth phase of bacterial cells. During the phosphate dissolution process, the pH of the medium continues to increase, inversely proportional to the concept in general. The EF.NAP 1 isolate is able to produce six organic acids, i.e, acetic (339.14 mg/L), lactic (260.97 (mg/L), malic (133.24 mg/L), formic (31.52 mg/L), fumaric (19.31 mg/L) and tartaric acids (19.13 mg/L). B. territorii can produce IAA, nitrogenase, siderophore, HCN, chitinase, protease, and cellulose. The potency of B. territorii EF.NAP 1 as phosphate solubilizing bacteria and PGPB properties that have not been reported by others.