The plant growth promoting bacteria Gluconacetobacter diazotrophicus and Azospirillum brasilense contribute to the iron nutrition of strawberry plants through siderophores production

LOVAISA NADIA C.; DELAPORTE QUINTANA PAOLA; PEDRAZA RAÚL O.; RAPISARDA VIVIANA ANDREA

PLANT GROWTH REGULATION

SPRINGER

Año: 2020 p. 185 - 199

0167-6903

Gluconacetobacter diazotrophicus PAL5 and Azospirillum brasilense REC3 are plantgrowth promoting bacteria. They are able to produce hydroxamate and catechol typesiderophores, respectively, when iron is not available, chelating this metal to facilitateits absorption. The aim of this work was to evaluate the two siderophores producers?bacteria in strawberry plants and their contribution to iron nutrition through the growthindex, leaf and root area, greenness index, total soluble phenolic compounds and totaliron content.Strawberry plants were grown hydroponically in Hoagland nutrientsolution, modified in iron sources, and inoculated with each bacterium. At day 60, thehighest values of growth index, root area, greenness index, and iron content, wereobtained in treatments with reduced iron, and the lowest values in treatments withoutiron addition. Values in treatments with oxidized iron and bacterial inoculation weresimilar to those obtained with reduced iron and uninoculated plants. At day 30,phenolic compounds were higher in treatments without iron addition and uninoculated,while they decreased when plants were inoculated. In treatments with reduced iron,phenolic compounds content was low and increased when plants were inoculated. Inconclusion, the siderophores produced by G. diazotrophicus PAL5 and A. brasilenseREC3 can contribute to the iron nutrition of strawberry plants hydroponically grown.The participation of the hydroxamates is better than that of the catechols in theprovision of iron to the plants.