Endophytes can be a promising alternative for sustainable agronomic practices. In this study, we report for the first time a root-colonizing fungal strain (Sl27) of the genus Leptobacillium as a tomato (Solanum lycopersicum) endophyte, with no clear homology to any known species. Performed analyses and assays, including morphological and physiological characterization of the fungal isolate, provided insights into the ecological niche and potential agronomical and industrial applications of the fungal isolate. The ability of Sl27 to establish a symbiotic relationship with the host plant was assessed through experiments under controlled conditions in the growth chamber and greenhouse. Seed-inoculation showed no detrimental effects in the three tomato genotypes studied (TH-30, ADX2, MO-10). The influence of Sl27 on growth parameters of the host plant was dependent on the tomato genotype, with TH-30 showing the most prominent improved phenotype. Moreover, chlorophyll and lycopene content in fruits were enhanced. These findings provide a basis for further studies on the potential application of this new isolate for improving crop performance.
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