IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Plant growth promotion assays in Eucalyptus grandis mediated by beneficial bacteria
Autor/es:
JOSÉ MARÍA CHAÍN; MARÍA JULIA ESTRELLA; GUSTAVO GUDESBLAT; FERNANDO PIECKENSTAIN; GABRIELA AMODEO; FERNANDO PIECKENSTAIN; GABRIELA AMODEO; ESTEBAN TUBERT; IRENE BAROLI; ESTEBAN TUBERT; IRENE BAROLI; JOSÉ MARÍA CHAÍN; MARÍA JULIA ESTRELLA; GUSTAVO GUDESBLAT
Lugar:
Capital Federal
Reunión:
Congreso; Reunión Conjunta de Sociedades de Biociencias; 2017
Institución organizadora:
Comité Conjunto de Sociedades de Biociencias
Resumen:
Eucalyptus grandis is one of the most commercially important foresttree species in Argentina. Outplanting of greenhouse-grown E.grandis seedlings to the field is a critical step, since the availabilityof water and nutrients in the immediate vicinity of the rhizospheredetermines the survival of individuals and affects the health and futureperformance of the plantation. Plant-growth promoting bacteriaare used in many crops to improve nutrition and tolerance to abioticstress, however their use in trees is very limited, in part due to difficultiesin application. In this work we have used a superabsorbenthydrophylic polymer (used in forestry to alleviate water stress duringseedling establishment) as a carrier for plant growth-promotingbacteria. A collection of bacterial leaf endophytes was screened fortheir ability to promote E. grandis germination and initial seedlinggrowth. Four promising strains were further tested for their capacityto alleviate nutrient deficiency (phosphate deficiency or a sequentialdecrease in added fertilizer) in two-month old E. grandis seedlingsgrown in environmentally controlled chambers. The seedlings wereinoculated by transplanting them to pots containing substrate togetherwith superabsorbent polymer, which had been previously mixedwith the selected plant-growth promoting bacterial strains. Preliminaryresults show that all four strains improved plant height andstem diameter, both with and without nutrient deprivation. One ofthese strains, which was identified as a Pseudomonas fluorescens,significantly reduced leaf stomatal conductance (one-way ANOVA,p