NOVELTY - Use of a Trichoderma longibrachiatum strain comprising an autologous nucleotide sequence coding for a protein having at least 70% sequence similarity with the amino acid sequence of SEQ ID NO: 1 (comprising a fully defined sequence of 71 amino acids as given in the specification), such as Trichoderma longibrachiatum strain IVIK1 deposited as CBS 137023, for the treatment of a plant, is claimed.    USE - The Trichoderma longibrachiatum strain is useful: for the treatment of a plant, where the treatment of the plant preferably is aimed at least at one of plant growth modulation, such as improvement of plant fresh weight, improvement of plant dry weight, improvement of root development, including improvement of root nodulation in Leguminosae, increase of germination percentage and/or increase of germination speed, or disease control, such as via anti-microbial activity, preferably antifungal activity, or via stimulation of systemic resistance; and for producing a protein, which is useful for growing plants (all claimed). The ability of the protein to increase the plant fresh weight was tested in cucumber. The results showed that plants treated with HYTLO1 protein exhibited an increase of 34.1% versus control, in plant fresh weight.    ADVANTAGE - The Trichoderma longibrachiatum strain: exhibits synergistic effects in treating the plants; and provides a composition with improved shelf-life.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a composition, preferably an agronomical composition, comprising a carrier, and a source of a protein having at least 70% sequence similarity with an amino acid sequence of SEQ ID NO: 1, where the protein is an autologous protein from a Trichoderma longibrachiatum strain; (2) use of a protein having at least 70% sequence similarity with an amino acid sequence of SEQ ID NO: 1, for the treatment of a plant, where the protein is provided as an autologous protein from Trichoderma longibrachiatum, where the protein is preferably provided in a composition; (3) a method (M1) for producing a protein having at least 70% sequence similarity with an amino acid sequence of SEQ ID NO: 1 comprising: providing Trichoderma longibrachiatum comprising a functional autologous gene coding for the protein; culturing biomass of Trichoderma longibrachiatum under conditions suitable for expression of the gene; and obtaining the protein from the culture; (4) the protein obtainable with the method (M1); (5) Trichoderma longibrachiatum strain IVIK1 as deposited under CB5137023; (6) a seed treated with the composition; and (7) a method (M2) for growing a number of plants, comprising: providing the number of plants; treating the number of plants with a source of a protein having at least 70% sequence similarity with an amino acid sequence of SEQ ID NO: 1, where the protein is provided as an autologous protein from a Trichoderma longibrachiatum; and providing to the number of plants suitable nutrients and environmental conditions to develop.