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ISHS Acta Horticulturae 1148: II World Congress on the Use of Biostimulants in Agriculture

Effects of a protein hydrolysate-based biostimulant and two micronutrient based fertilizers on plant growth and epiphytic bacterial population of lettuce

Authors:   F. Luziatelli, A.G. Ficca, G. Colla, E. Svecova, M. Ruzzi
Keywords:   biostimulants, foliar fertilizers, Lactuca sativa L., epiphytic bacteria, plant growth promoting bacteria, Pantoea, Micrococcus
DOI:   10.17660/ActaHortic.2016.1148.5
Abstract:
There is growing evidence demonstrating the potential of various organic substances, including plant extracts and plant derived-protein hydrolysates, to increase crop productivity and ameliorate crop tolerance to abiotic stresses, such as drought and salinity. In contrast to the large amount of data on the impact of these substances on crop productivity, little information is available on their effect on the biodiversity of plant-associated bacteria. The aim of this study was to evaluate the effect of foliar applications of a protein hydrolysate-based biostimulant ('Trainer'), a fertilizer containing micronutrients mixed with plant extracts ('Auxym'), and a fertilizer containing copper complexed with peptides and amino acids ('Scudo') on the structure of phyllosphere bacterial community in lettuce. Data obtained using culture-independent (Terminal Restriction Fragment Length Polymorphism) and culture-dependent approaches indicated that biostimulant/fertilizers altered the composition of the microbial population and stimulated the growth of specific bacteria taxa exhibiting potential plant growth-promoting properties (indole acetic production and phosphate solubilization) and/or biocontrol activity against Fusarium oxysporum and Erwinia amylovora.

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