BLR-1 and BLR-2, key regulatory elements of photoconidiation and mycelial growth in Trichoderma atroviride

• DOI: 10.1099/mic.0.27346-0
• Publication Date: 2004-11-05T00:22:57Z
• Authors: Sergio Casas-Flores; Mauricio Rios-Mom...; Martha Bibbins; Patricia Ponce-No...; Alfredo Herrera-E...
• Keywords: Conidiation; Phototropism; Neurospora; Fungal protein

In fungi, phototropism, the induction of carotenogenesis and reproductive structures, resetting circadian rhythm are controlled by blue light. Trichoderma atroviride , a fungus used in biological control, sporulates synchronized manner following brief pulse Due to its apparent simplicity, this response was chosen for pursuing photoreceptor isolation. Two genes were cloned, blue-light regulators 1 2 ( blr-1 blr-2 ), similar Neurospora crassa white-collar 2, respectively. The BLR-1 protein has all characteristics photoreceptor, whereas structure deduced BLR-2 suggests that it interacts with through PAS domains form complex. Disruption corresponding demonstrated they essential blue-light-induced conidiation. also shown be light-induced expression photolyase-encoding gene phr-1 ). Mechanical injury mycelia found trigger conidiation T. not described previously. This altered mutants. A novel effect both red light on mycelial growth involving another receptor, which is compensated BLR proteins.