IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Plant growth promotion assays in Ecualiptus grandis mediated by benefitial bacteria
Autor/es:
BAROLI IRENE; ESTEBAN TUBERT; GUDESBLAT, GUSTAVO; ESTRELLA, JULIA; CHAÍN, JOSÉ MARÍA; AMODEO, GABRIELA; PIECKENSTAIN, FERNANDO
Lugar:
Buenos AIRES
Reunión:
Congreso; Reunión Conjunta de Sociedades de Biociencias; 2017
Institución organizadora:
Sociedades de Biociencias Argentinas
Resumen:
Eucalyptus grandis is one of the most commercially important forest tree species in Argentina. Outplanting of greenhouse-grown E. grandis seedlings to the field is a critical step, since the availability of water and nutrients in the immediate vicinity of the rhizosphere determines the survival of individuals and affects the health and future performance of the plantation. Plant-growth promoting bacteria are used in many crops to improve nutrition and tolerance to abiotic stress, however their use in trees is very limited, in part due to difficulties in application. In this work we have used a superabsorbent hydrophylic polymer (used in forestry to alleviate water stress during seedling establishment) as a carrier for plant growth-promoting bacteria. A collection of bacterial leaf endophytes was screened for their ability to promote E. grandis germination and initial seedling growth. Four promising strains were further tested for their capacity to alleviate nutrient deficiency (phosphate deficiency or a sequential decrease in added fertilizer) in two-month old E. grandis seedlings grown in environmentally controlled chambers. The seedlings were inoculated by transplanting them to pots containing substrate together with superabsorbent polymer, which had been previously mixed with the selected plant-growth promoting bacterial strains. Preliminary results show that all four strains improved plant height and stem diameter, both with and without nutrient deprivation. One of these strains, which was identified as a Pseudomonas fluorescens, significantly reduced leaf stomatal conductance (one-way ANOVA, p