title: Silencing of PMT expression caused a surge of anatabine accumulation in tobacco.
abstract: Drastic increase of anatabine levels was observed in tobacco plants with markedly reduced nicotine concentrations through RNA silencing approaches. By down-regulation of PMT through three kinds of RNA silencing approaches, the nicotine levels decreased accordingly. In lines with slight and moderate reduction of nicotine levels, no anticipated negative linear correlation was found between anatabine and nicotine content. In lines with nicotine levels lower than 2.7 mg/g, drastic elevation of anatabine levels was found. Transcriptional levels of QPRT were unaffected in tobacco lines with surged anatabine levels. This report of an intriguing mutual relationship of nicotine and anatabine sheds new light on mechanisms between metabolic regulations in plants, and reconfirms complexity of metabolic networks.
authors.affiliation: State Key Laboratory of Genetic Engineering, School of Life Sciences, Fudan-SJTU-Nottingham Plant Biotechnology R&D Center, Morgan-Tan International Center for Life Sciences, Fudan University, 200433 Shanghai, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Jia
authors.initials: J
authors.lastname: Zeng
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Liang
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Miao
authors.forename: Xiaofen
authors.initials: X
authors.lastname: Sun
authors.forename: Kexuan
authors.initials: K
authors.lastname: Tang
mesh_terms: D000470:Alkaloids / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D053858:Metabolic Networks and Pathways / Q000235:genetics; D008780:Methyltransferases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D010430:Pentosyltransferases / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D011725:Pyridines / Q000378:metabolism*; D034622:RNA Interference; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014026:Nicotiana / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism*; D000098553:Nicotinate-Nucleotide Diphosphorylase (Carboxylating)
chemical_list: D000470:Alkaloids; D010940:Plant Proteins; D011725:Pyridines; D018749:RNA, Plant; C012737:anatabine; D008780:Methyltransferases; C112598:putrescine N-methyltransferase; D010430:Pentosyltransferases; D000098553:Nicotinate-Nucleotide Diphosphorylase (Carboxylating)