Year: 2012
Type: article
Abstract: The expansion of organic agriculture has increased the demand for alternatives to chemical fertilizers and pesticides.Biopesticides and biofertilizers are part of a set of natural-based products being widely use to enrich the quality of the soil and control pests.In this study, a series of greenhouse and field bioassays were carried out with the aim of determining the biocontrol and biofertilizer effects of treatments prepared with Mitsuaria sp.strain H24L5A and Burkholderia sp.strain R4F2 in comparison with a commerciallyavailable Streptomyces inoculant on plants.Additionally, the effects of an experimental algae-based biofertilizer and commercial and pre-commercial biofertilizer products were assessed.First, a bioassay method was developed to successfully detect plant growth promotion and reduction of disease severity when the different treatments were applied by drenching.At a concentration of 10 7 cells/ml, Mitsuaria sp.provided the greatest biocontrol of bacterial leaf spot (P< 0.05) with a 39% reduction as compared to the negative control in tomato greenhouse bioassays.Although not statistically significant, field experiments showed a trend also indicating a 12% reduction in bacterial leaf spot by Mitsuaria sp.. Mitsuaria sp. and Burkholderia sp.treatments provided the greatest enhancements of shoot growth and biomass (P < 0.05) up to 64% as compared to the negative controls in tomato greenhouse bioassays.These data indicate the biocontrol and plant growth promoting activities of the experimental bacterial ingredients.Furthermore, the results indicated that these unformulated inoculants have utility comparable to that of iv commercial formulations.This is the first report of Mitsuaria sp.strain H24L5A and Burkholderia sp.strain R4F2 as biocontrol agents of bacterial leaf spot and plant growth promotion agents of tomato and wheat.
Author: Maria Veronica Cepeda
Institution: The Ohio State University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2253335910