Indole 3-Acetic Acid (Iaa)-, Ammonium Ion- And Soluble Phosphate-Producing Endophytic Bacteria

Abstract

The avocado (Persea americana Mill) is native to Mexico, through Central America it reaches Colombia. It is produced in more than 30 countries around the world, making it the fourth most widely distributed tropical fruit in the world. This crop in the Mountain of María, Colombia was abandoned due to the abandonment of producers due to the armed conflict, producing a considerable increase in phytosanitary diseases, which has produced high impact economic losses in that subregion. Endophytic bacteria are essential for the growth and health of arable plants. However, the composition and presence of endophytic bacteria in avocado seedlings have been scarcely studied. The objective of this study was to isolate, quantify and identify by 16S rDNA sequence analysis, the presence of endophytic bacteria associated with different tissues of avocado seedlings in the municipalities of Chalán and Ovejas in the department of Sucre, Colombia. The results of the 16S DNAr sequences identified the following group of endophytic bacteria associated with different avocado seedling tissues: Klebsiella pneumoniae; Bacillus pumilus; Bacillus licheniformis; Bacillus methylotrophicus; Bacillus cereus; Staphylococcus haemolyticus; Pseudomonas putida; Pseudomonas fluorescens y Pseudomonas entomophila. These findings suggest the presence of a high group of these bacteria associated with this crop of commercial interest for the Mountain of María subregion, which could provide protection to these plants against phytopathogens, induce resistance in them and promote plant growth.