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Some
Epichloë
species are beneficial to their plant hosts by improving fitness and resistance to stress. The natural, seedborne, asymptomatic symbiotic endophyte
Epichloë sinica
is specific for
Roegneria
spp., which are perennial grasses found in grasslands or meadows; many species of
Roegneria
are excellent forage plants. This study was designed to reveal the biological function of
E. sinica
via seedling assays with drought simulation using polyethylene glycol (PEG)-6000. Endophyte infected (EI) and endophyte free (EF)
R. kamoji
seeds (obtained by heat treatment) were germinated and grown on 0, 10, 15 and 20% PEG-6000 for 10 days; seedling and root system morphologies were investigated, and reactive oxygen species (ROS), which act as signaling molecules in plant responses to abiotic stress, were detected.
E. sinica
enhanced both the germination potential and rate of
R. kamoji
seeds treated with high concentrations of PEG-6000. After PEG treatment, shoot and root morphologies differed significantly between EF and EI seedlings. Additionally, lower amounts of ROS concentration were detected in the leaves of EI seedlings treated with high concentrations of PEG-6000. In conclusion,
E. sinica
promoted PEG-6000 simulated drought stress resistance in
R. kamoji
seedlings.