PROIMI   05436
PLANTA PILOTO DE PROCESOS INDUSTRIALES MICROBIOLOGICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
GROWTH PROMOTING OF MAIZE BY PHOSPHATE SOLUBILIZING BACTERIA
Autor/es:
VIRUEL, E; LUCCA, M. E.; SIÑERIZ, F.
Lugar:
Rosario, Santa Fe, Argentina
Reunión:
Congreso; V Congreso Argentino de Microbiología General, Sociedad Argentina de Microbiología General (SAMIGE); 2008
Institución organizadora:
Sociedad Argentina de Microbiología General (SAMIGE)
Resumen:
The possibility of using soil microbes that promote nutrition and development of plants provides new alternatives for increasing the yield of major agricultural crops and avoid the indiscriminate use of chemical fertilizers. The soils involved in these practices, have high contents of insoluble mineral phosphates, but are generally deficient in soluble phosphates (Pi), essential for plants and microorganisms development. Plant Growth–Promoting Rhizobacteria (PGPR) are soil free-living bacteria that increase or facilitate, directly or indirectly, the plant growth. They have a range of properties, including P-solubilization, nitrogen fixation, and production of phytohormones, antibiotics and siderophores. Is interestingly the implementation of native PGPR strains as inoculants in region crops, since they are adapted to soil type and are able to compete efficiently with the local microflora. In our laboratory a collection of plant native growth–promoting rhizobacteria of Puna soil (NOA) was isolated. We use as selection criteria phosphate-solubilizing activity, growth in phosphorus limited concentration and siderophores production. From 45 isolates, 4 microorganisms were selected on base the above criteria. They were taxonomically identified as Serratia marcescens EV1, Pantoea agglomerans EV2, Pantoea agglomerans EV3 and Pantoea agglomerans EV4, by molecular techniques (access number FM202483 to FM202486). The growth-promoter effect was determined by inoculating bacteria on maize plants grown under controlled conditions in glasshouse. Nutrient solution with Ca3(PO4)2 as unique source of phosphorus was added periodically. As growth measure, dry weight of root and shoot system was evaluated after 30 days incubation. The isolated strains increased significantly (p<0.05) dry weight regarding to control. Pantoea agglomerans EV4 was selected as the strain with major capability to promote root and shoot development. In short, results from these experiments suggest that inoculation of PGPR with different beneficial properties, like P-solubilization, should be the future trends of bio-fertilizer application for sustainable crop production.