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Overexpression of a Trichoderma HSP70 gene increases fungal resistance to heat and other abiotic stresses

2008; Academic Press; Volume: 45; Issue: 11 Linguagem: Inglês

10.1016/j.fgb.2008.09.003

1096-0937

Marta Montero-Barrientos, Rosa Hermosa, Carlos Nicolás, Rosa E. Cardoza, Santiago Gutiérrez, Enrique Monte,

Essential Oils and Antimicrobial Activity

All organisms share similar mechanisms in the heat shock response, such as synthesis of conserved heat shock proteins. Here, we report on the cloning, characterization and functional analysis of a Trichoderma harzianum T34 hsp70 gene. The expression of this gene was evaluated in cultures grown in abiotic stress conditions. An increased level of expression was detected when the fungus was grown at 37 or 41 °C, as well as in the presence of oxidative or osmotic agents. The overexpression of hsp70 in T. harzianum T34 gave rise to transformants with higher quantities of biomass obtained after heat shock treatment. In addition, these transformants showed an enhanced tolerance to oxidative, osmotic and salt stresses when conidia were previously treated at 45 °C for 2 h.