| Variations on conserved signaling pathways in biocontrol and development:G protein and MAPK genes of Trichoderma. atroviride and T. virens |
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| 作者姓名： | Benjiamin A Horwitz |
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| 作者单位： | Department of |
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| 摘 要： | Filamentous fungi employ conserved eukaryotic signaling pathway to detect and respond to environmental signals, including the presence of the host. Genetic experiment in which a particular signaling protein is lost, or its activity enhanced, have defined some of the function of heterotrimeric G proteins and MAP kinases in development and virulence. A hallmark of these studies is that orthologs in different species may have different functions. Antagonistic fungal-fungal interactions form …
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| 关 键 词： | 木霉属 真菌 基因 变异 信号通道 G蛋白 生物防治 |
| 文章编号： | 1008-9209(2004)04-0444-01 |
Variations on conserved signaling pathways in biocontrol and development:G protein and MAPK genes of Trichoderma.atroviride and T.virens |
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| Benjiamin A,Horwitz.Variations on conserved signaling pathways in biocontrol and development:G protein and MAPK genes of Trichoderma. atroviride and T. virens[J].Journal of Zhejiang University(Agriculture & Life Sciences),2004,30(4):444-444. |
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| Authors: | Benjiamin A Horwitz |
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| Institution: | Department of Biology, Technion, Haifa 32000, Israel |
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| Abstract: | Filamentous fungi employ conserved eukaryotic signaling pathway to detect and respond to environmental signals, including the presence of the host. Genetic experiment in which a particular signaling protein is lost, or its activity enhanced, have defined some of the function of heterotrimeric G proteins and MAP kinases in development and virulence. A hallmark of these studies is that orthologs in different species may have different functions. Antagonistic fungal-fungal interactions form the basis for biological control of plant disease. These interactions may employ novel modes of regulation by conserved signaling elements. Tag1, a G protein a subunit of Trichoderma. atroviride belonging to fungal Gi class, is involved in repression of sporulation and hyphal coiling(1). Deletion of ortholog of this gene, TgaA, in Trichoderma (Gliocladium) virens, however, did not affect sporulation and growth, yet tgaA mutants are unable to parasitize S. rolfsii sclerotia(2). Mutation of a second G αsubunit gene is now under study. TmkA, a MAPK gene of T. virens, is involved in biocontrol properties and repression of conidiation (3). Using suppression-subtraction hybridization and other approaches, we are beginning to identify additional elements of the signaling cascades and their downsteam targets. The role of G protein and MAPK genes are sometimes specific to a particular host fungus or to parasitism of mycelia or sclerotia (2, 3). Also of relevance to biocontrol, signal transduction pathway provide a means to alter the balance between sporulation, mycelial growth and hyphal coiling. |
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| Keywords: | biocontrol mycoparasitism signal transduction G protein MAP kinase coiling sporulation conidiation |
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