共 54 条
Transient over-expression of barley BAX Inhibitor-1 weakens oxidative defence and MLA12-mediated resistance to Blumeria graminis f.sp hordei
被引:25
作者:

Eichmann, Ruth
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机构:
Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany

Dechert, Cornelia
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Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany

Kogel, Karl-Heinz
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Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany

Hueckelhoven, Ralph
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Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany
机构:
[1] Univ Giessen, Res Ctr BioSyst, Inst Phytopathol & Appl Zool, D-35392 Giessen, Germany
关键词:
D O I:
10.1111/j.1364-3703.2006.00359.X
中图分类号:
Q94 [植物学];
学科分类号:
071001 ;
摘要:
BAX Inhibitor-1 (BI-1) is a conserved cell death suppressor protein. In barley, BI-1 (HvBI-1) expression is induced upon powdery mildew infection and when over-expressed in epidermal cells of barley, HvBI-1 induces susceptibility to the biotrophic fungal pathogen Blumeria graminis. We co-expressed mammalian pro-apoptotic BAX together with HvBI-1, and the mammalian BAX antagonist BCL-X-L in barley epidermal cells. BAX expression led to cessation of cytoplasmic streaming and collapse of the cytoplasm while co-expression of HvBI-1 and BCL-X-L partially or completely, respectively, rescued cells from BAX lethality. When B. graminis was attacking epidermal cells, a green fluorescent protein fusion of HvBI-1 accumulated at the site of attempted penetration and was also present around haustoria. Over-expression of HvBI-1 in epidermal cells weakened a cell-wall-associated local hydrogen peroxide burst in a resistant mlo-mutant genotype and supported haustoria accommodation in race-specifically resistant MLA12-barley. HvBI-1 is a cell death regulator protein of barley with the potential to suppress host defence reactions.
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页码:543 / 552
页数:10
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