title: Distinct roles of the pepper pathogen-induced membrane protein gene CaPIMP1 in bacterial disease resistance and oomycete disease susceptibility.
abstract: Plant integral membrane proteins have essential roles in diverse internal and external physiological processes as signal receptors or ion transporters. The pepper CaPIMP1 gene encoding a putative integral membrane protein with four transmembrane domains was isolated and functionally characterized from pepper leaves infected with the avirulent strain Xanthomonas campestris pv. vesicatoria (Xcv). CaPIMP1-green fluorescence protein (GFP) fusions localized to the plasma membrane in onion cells, as observed by confocal microscopy. CaPIMP1 was expressed in an organ-specific manner in healthy pepper plants. Infection with Xcv induced differential accumulation of CaPIMP1 transcripts in pepper leaf tissues during compatible and incompatible interactions. The function of CaPIMP1 was examined by using the virus-induced gene silencing technique in pepper plants and by overexpression in Arabidopsis. CaPIMP1-silenced pepper plants were highly susceptible to Xcv infection and expressed lower levels of the defense-related gene CaSAR82A. CaPIMP1 overexpression (CaPIMP1-OX) in transgenic Arabidopsis conferred enhanced resistance to P. syringae pv. tomato infection, accompanied by enhanced AtPDF1.2 gene expression. In contrast, CaPIMP1-OX plants were highly susceptible to the biotrophic oomycete Hyaloperonospora parasitica. Taken together, we propose that CaPIMP1 plays distinct roles in both bacterial disease resistance and oomycete disease susceptibility.
authors.affiliation: Laboratory of Molecular Plant Pathology, School of Life Sciences and Biotechnology, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136-713, Republic of Korea.
authors.forename: Jeum Kyu
authors.initials: JK
authors.lastname: Hong
authors.forename: Du Seok
authors.initials: DS
authors.lastname: Choi
authors.forename: Sang Hee
authors.initials: SH
authors.lastname: Kim
authors.forename: Seung Yeon
authors.initials: SY
authors.lastname: Yi
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Byung Kook
authors.initials: BK
authors.lastname: Hwang
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics / Q000382:microbiology; D002212:Capsicum / Q000235:genetics* / Q000276:immunology / Q000382:microbiology*; D002462:Cell Membrane / Q000378:metabolism; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D049452:Green Fluorescent Proteins / Q000378:metabolism; D007113:Immunity, Innate / Q000235:genetics; D008969:Molecular Sequence Data; D009868:Oomycetes / Q000502:physiology*; D010935:Plant Diseases / Q000235:genetics / Q000276:immunology* / Q000382:microbiology*; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013347:Subcellular Fractions / Q000378:metabolism; D016959:Xanthomonas campestris / Q000502:physiology
chemical_list: D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins