title: Enhancement of tolerance to soft rot disease in the transgenic Chinese cabbage (Brassica rapa L. ssp. pekinensis) inbred line, Kenshin.
abstract: We developed a transgenic Chinese cabbage (Brassica rapa L. ssp. pekinensis) inbred line, Kenshin, with high tolerance to soft rot disease. Tolerance was conferred by expression of N-acyl-homoserine lactonase (AHL-lactonase) in Chinese cabbage through an efficient Agrobacterium-mediated transformation method. To synthesize and express the AHL-lactonase in Chinese cabbage, the plant was transformed with the aii gene (AHL-lactonase gene from Bacillus sp. GH02) fused to the PinII signal peptide (protease inhibitor II from potato). Five transgenic lines were selected by growth on hygromycin-containing medium (3.7% transformation efficiency). Southern blot analysis showed that the transgene was stably integrated into the genome. Among these five transgenic lines, single copy number integrations were observed in four lines and a double copy number integration was observed in one transgenic line. Northern blot analysis confirmed that pinIISP-aii fusion gene was expressed in all the transgenic lines. Soft rot disease tolerance was evaluated at tissue and seedling stage. Transgenic plants showed a significantly enhanced tolerance (2-3-fold) to soft rot disease compared to wild-type plants. Thus, expression of the fusion gene pinIISP-aii reduces susceptibility to soft rot disease in Chinese cabbage. We conclude that the recombinant AHL-lactonase, encoded by aii, can effectively quench bacterial quorum-sensing and prevent bacterial population density-dependent infections. To the best of our knowledge, the present study is the first to demonstrate the transformation of Chinese cabbage inbred line Kenshin, and the first to describe the effect of the fusion gene pinIISP-aii on enhancement of soft rot disease tolerance.
authors.affiliation: Department of Horticulture, Chungnam National University, Gung-dong, Yuseong-gu, Daejeon 305-764, Korea.
authors.forename: Enkhchimeg
authors.initials: E
authors.lastname: Vanjildorj
authors.forename: Seo Young
authors.initials: SY
authors.lastname: Song
authors.forename: Zhi Hong
authors.initials: ZH
authors.lastname: Yang
authors.forename: Jae Eul
authors.initials: JE
authors.lastname: Choi
authors.forename: Yoo Sun
authors.initials: YS
authors.lastname: Noh
authors.forename: Suhyoung
authors.initials: S
authors.lastname: Park
authors.forename: Woo Jin
authors.initials: WJ
authors.lastname: Lim
authors.forename: Kye Man
authors.initials: KM
authors.lastname: Cho
authors.forename: Han Dae
authors.initials: HD
authors.lastname: Yun
authors.forename: Yong Pyo
authors.initials: YP
authors.lastname: Lim
mesh_terms: D001407:Bacillus / Q000472:pathogenicity*; D029741:Brassica rapa / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D002265:Carboxylic Ester Hydrolases / Q000235:genetics / Q000378:metabolism; D007113:Immunity, Innate; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D030821:Plants, Genetically Modified / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D053038:Quorum Sensing; D012231:Rhizobium / Q000235:genetics
chemical_list: D002265:Carboxylic Ester Hydrolases; C432003:N-acyl homoserine lactonase
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