title: Overexpression of the Malus hupehensis MhNPR1 gene increased tolerance to salt and osmotic stress in transgenic tobacco.
abstract: Earlier, we have reported that overexpression of Malus hupehensis Non-expressor of pathogenesis related gene 1 (MhNPR1) gene in tobacco could induce the expression of pathogenesis-related genes and enhance resistance to fungus Botrytis cinerea. In this study, we showed that MhNPR1 can be induced by NaCl, PEG6000, low temperature (4 °C), abscisic acid and apple aphids' treatments in M. hupehensis. Heterogonous expression of MhNPR1 gene in tobacco conferred enhanced resistance to NaCl at the stage of seed germination, and conferred resistance to mannitol at the stage of seed germination and to PEG6000 at the stage of seedlings. Furthermore, overexpression of MhNPR1 in transgenic tobacco led to higher expression levels of osmotic-stress related genes compared with wild-type plants. This was the first report of a novel function of NPR1 that overexpression of MhNPR1 gene has a positive effect on salt and osmotic stress in tobacco, which differs from the function that overexpressing of AtNPR1 gene has a negative effect on dehydration and salt stress in rice.
authors.affiliation: Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing, 210014, China.
authors.forename: Ji-Yu
authors.initials: JY
authors.lastname: Zhang
authors.forename: Shen-Chun
authors.initials: SC
authors.lastname: Qu
authors.forename: Yu-Shan
authors.initials: YS
authors.lastname: Qiao
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhong-Ren
authors.initials: ZR
authors.lastname: Guo
mesh_terms: D029681:Arabidopsis Proteins / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D027845:Malus / Q000235:genetics / Q000378:metabolism; D009997:Osmotic Pressure; D030821:Plants, Genetically Modified; D055049:Salt Tolerance / Q000235:genetics*; D012492:Salts; D012965:Sodium Chloride; D014026:Nicotiana / Q000235:genetics* / Q000254:growth & development*
chemical_list: D029681:Arabidopsis Proteins; C105496:NPR1 protein, Arabidopsis; D012492:Salts; D012965:Sodium Chloride