Induction of essential oil production in Mentha x piperita by plant growth promoting bacteria was correlated with an increase in jasmonate and salicylate levels and a higher density of glandular trichomes

CAPPELLARI, LORENA DEL ROSARIO; SANTORO, MARICEL VALERIA; SCHMIDT, AXEL; GERSHENZON, JONATHAN; BANCHIO, ERIKA

PLANT PHYSIOLOGY AND BIOCHEMISTRY

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Año: 2019 vol. 141 p. 142 - 153

0981-9428

Plant growth promoting bacteria (PGPB) are agriculturally important soil bacteria that increase plant growth.We subjected peppermint to inoculation with three species of PGPB. After inoculation, the plants were sprayedwith methyl jasmonate solution (MeJA) or SA (salicylic acid). Then, the plants were harvested and the plantgrowth parameters, trichome density, EO content and endogenous phytohormones were measured. Shoot freshweight was reduced in plants inoculated and treated with MeJA whereas EO content varied depending on theMeJA concentration applied. Plants inoculated and treated with MeJA 2mM showed the maximum increase inEO production, revealing a synergism between PGPB and MeJA. SA treatments also enhanced EO yield. Theincreased growth and EO production observed upon PGPB application were at least partly due to an increase inthe JA and SA concentrations in the plant, as well as to an associated rise in the glandular trichome density