Bioprospecção de isolados de Bacillus spp. Como potenciais promotores de crescimento de Eucalyptus urograndis

Abstract

The objective of this study was to evaluate biochemical characteristics of agronomic interest and correlation with the promotion of plant grow thin isolates of Bacillus sp. originating from the eucalyptus rhizosp here. The experiment was conducted in laboratory and greenhouse. From the bacteria isolation from the rhizo sp here of plants from different cities of the western region of São Paulo, were obtained 127 isolates of Bacillus sp. Biochemical tests were performed to characterize thebacterial isolateson the antagonism of pathogenic fungi, the production of auxin, ammonia and enzymatic activity. In the final ste pwe evaluated the potential of the isolates, previous lycharacterizedin laboratory conditions, to promote plant growth, using bacteria inoculation in eucalyptus seedling sand growing plants in a green house for 90 days. Eucalyptus growth were evaluated aiming to select the best strain sand to correlate the different variables asses sed. The bio prospecting protocol for Bacillus sp. Rhizosp here was valid to find promising rhizobacteria in increasing eucalyptus growth. Five isolates were selected as promising foracti on on growing eucalyptus. The antagonistic to pathogenic fungi and ammonia production found in isolate so frhizobacteria help fulin the initial selection of plant growth promoting rhizobacteria eucalyptus as significantly correlated with plant growth.