AUTHOR=Russo Assunta , Winkler Jana Barbro , Ghirardo Andrea , Monti Maurilia M. , Pollastri Susanna , Ruocco Michelina , Schnitzler Jörg-Peter , Loreto Francesco 

TITLE=Interaction with the entomopathogenic fungus Beauveria bassiana influences tomato phenome and promotes resistance to Botrytis cinerea infection

JOURNAL=Frontiers in Plant Science

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1309747

DOI=10.3389/fpls.2023.1309747

ISSN=1664-462X

ABSTRACT=<p>Plants are central to complex networks of multitrophic interactions. Increasing evidence suggests that beneficial microorganisms (BMs) may be used as plant biostimulants and pest biocontrol agents. We investigated whether tomato (<italic>Solanum lycopersicum</italic>) plants are thoroughly colonized by the endophytic and entomopathogenic fungus <italic>Beauveria bassiana</italic>, and how such colonization affects physiological parameters and the phenotype of plants grown under unstressed conditions or exposed to the pathogenic fungus <italic>Botrytis cinerea</italic>. As a positive control, a strain of the well-known biocontrol agent and growth inducer <italic>Trichoderma afroharzianum</italic> was used. As multitrophic interactions are often driven by (or have consequences on) volatile organic compounds (VOCs) released by plants constitutively or after induction by abiotic or biotic stresses, VOC emissions were also studied. Both <italic>B. bassiana</italic> and <italic>T. afroharzianum</italic> induced a significant but transient (one to two-day-long) reduction of stomatal conductance, which may indicate rapid activation of defensive (rejection) responses, but also limited photosynthesis. At later stages, our results demonstrated a successful and complete plant colonization by <italic>B. bassiana</italic>, which induced higher photosynthesis and lower respiration rates, improved growth of roots, stems, leaves, earlier flowering, higher number of fruits and yield in tomato plants. <italic>Beauveria bassiana</italic> also helped tomato plants fight <italic>B. cinerea</italic>, whose symptoms in leaves were almost entirely relieved with respect to control plants. Less VOCs were emitted when plants were colonized by <italic>B. bassiana</italic> or infected by <italic>B. cinerea</italic>, alone or in combination, suggesting no activation of VOC-dependent defensive mechanisms in response to both fungi.</p>