title: Function of a novel GDSL-type pepper lipase gene, CaGLIP1, in disease susceptibility and abiotic stress tolerance.
abstract: GDSL-type lipase is a hydrolytic enzyme whose amino acid sequence contains a pentapeptide motif (Gly-X-Ser-X-Gly) with active serine (Ser). Pepper GDSL-type lipase (CaGLIP1) gene was isolated and functionally characterized from pepper leaf tissues infected by Xanthomonas campestris pv. vesicatoria (Xcv). The CaGLIP1 protein was located in the vascular tissues of Arabidopsis root. The CaGLIP1 gene was preferentially expressed in pepper leaves during the compatible interaction with Xcv. Treatment with salicylic acid, ethylene and methyl jasmonate induced CaGLIP1 gene expression in pepper leaves. Sodium nitroprusside, methyl viologen, high salt, mannitol-mediated dehydration and wounding also induced early and transient CaGLIP1 expression in pepper leaf tissues. Virus-induced gene silencing of CaGLIP1 in pepper conferred enhanced resistance to Xcv, accompanied by the suppressed expression of basic PR1 (CaBPR1) and defensin (CaDEF1) genes. The CaGLIP1 lipase produced in Escherichia coli hydrolyzed the substrates of short and long chain nitrophenyl esters. The CaGLIP1-overexpressing Arabidopsis exhibited enhanced hydrolytic activity toward short and long chain nitrophenyl ester, as well as enhanced susceptibility to the bacterial pathogen Pseudomonas syringae pv. tomato and the biotrophic oomycete Hyaloperonospora parasitica. SA-induced expression of AtPR1 and AtGST1, also was delayed in CaGLIP1-overexpressing plants by SA application. During seed germination and plant growth, the CaGLIP1 transgenic plants showed drought tolerance and differential expression of drought- and abscisic acid (ABA)-inducible genes AtRD29A, AtADH and AtRab18. ABA treatment differentially regulated seed germination and gene expression in wild-type and CaGLIP1 transgenic Arabidopsis. Overexpression of CaGLIP1 also regulated glucose- and oxidative stress signaling. Together, these results indicate that CaGLIP1 modulates disease susceptibility and abiotic stress tolerance.
authors.affiliation: Laboratory of Molecular Plant Pathology, College of Life Sciences and Biotechnology, Korea University, Anam-dong, Sungbuk-ku, Seoul 136-713, South Korea.
authors.forename: Jeum Kyu
authors.initials: JK
authors.lastname: Hong
authors.forename: Hyong Woo
authors.initials: HW
authors.lastname: Choi
authors.forename: In Sun
authors.initials: IS
authors.lastname: Hwang
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Kim
authors.forename: Nak Hyun
authors.initials: NH
authors.lastname: Kim
authors.forename: Du Seok
authors.initials: DS
authors.lastname: Choi
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Byung Kook
authors.initials: BK
authors.lastname: Hwang
mesh_terms: D000040:Abscisic Acid / Q000502:physiology; D000222:Adaptation, Physiological; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000382:microbiology / Q000502:physiology; D002212:Capsicum / Q000382:microbiology / Q000502:physiology*; D015870:Gene Expression; D020868:Gene Silencing; D005947:Glucose; D054884:Host-Pathogen Interactions / Q000502:physiology; D008049:Lipase / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010935:Plant Diseases / Q000276:immunology* / Q000382:microbiology; D030821:Plants, Genetically Modified / Q000378:metabolism; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D017422:Sequence Analysis, DNA; D014867:Water / Q000502:physiology; D016959:Xanthomonas campestris / Q000502:physiology*
chemical_list: D011994:Recombinant Proteins; D014867:Water; D000040:Abscisic Acid; D008049:Lipase; D005947:Glucose