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Trichoderma reesei (anamorph of Hypocrea jecorina) is well known as one of the most widely spread filamentous fungi in the natural saprophytic habitat for its ability to degrade lignocellulose materials.Efficient signalling pathways in perception and interpretation of environmental signals to secrete cellulases for providing carbon sources are essential in this process.Ras GTPases represent a kind of critical signal proteins involved in signal transduction and regulation of gene expression.In T.reesei the genome contains two Ras subfamily small GTPases TrRas1 and TrRas2 homologous to Ras1 and Ras2 from Saccharomyces cerevisiae, but their functions remain unknown.Here, we have investigated the roles of GTPases TrRas1 and TrRas2 during fungal morphogenesis and cellulase gene expression.