title: Measurement of oligochitosan-tobacco cell interaction by fluorometric method using europium complexes as fluorescence probes.
abstract: The interaction of oligochitosan and tobacco cells has been investigated by fluorometric method using two Eu(3+) complexes as the probes in this work. Based on the reaction of tobacco cells with oligochitosan conjugated to a strongly fluorescent Eu(3+) complex 4,4'-bis(1'',1'',1'',2'',2'',3'',3''-heptafluoro-4'',6''-hexanedion-6''-yl)chlorosulfo-o-terphenyl-Eu(3+) (oligochitosan-BHHCT-Eu(3+) conjugate), the binding kinetic process of oligochitosan-tobacco cells was fluorescently imaged. The results indicate that oligochitosan can be specifically bound to the walls as well as the membranes of tobacco cells. A sensitive and selective Eu(3+) complex luminescence probe specific for singlet oxygen, [4'-(10-methyl-9-anthryl)-2,2':6',2''-terpyridine-6,6''-diyl]bis(methylenenitrilo)tetrakis (acetate)-Eu(3+), was used for developing a new time-resolved fluorescence assay method for the determinations of indole-3-acetic acid (IAA) and peroxidase produced in the cells during the interaction of oligochitosan and tobacco cells. The assays are sensitive with the detection limits of 32 nM for IAA, and 1.2 nM for peroxidase, respectively. The concentration changes of IAA and peroxidase induced by oligochitosan in tobacco cells reveal that oligochitosan can effectively induce the increase of IAA concentration, accompanied by the decrease of peroxidase concentration. These results give a primary and reliable evidence to explain the growth-promoting mechanism of oligochitosan on the plants at molecular level.
authors.affiliation: Department of Biotechnology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
authors.forename: Weihua
authors.initials: W
authors.lastname: Guo
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Ye
authors.forename: Guilan
authors.initials: G
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Zhao
authors.forename: Jingli
authors.initials: J
authors.lastname: Yuan
authors.forename: Yuguang
authors.initials: Y
authors.lastname: Du
mesh_terms: D002686:Chitin / Q000031:analogs & derivatives* / Q000494:pharmacology; D048271:Chitosan; D005063:Europium; D005456:Fluorescent Dyes; D005470:Fluorometry / Q000379:methods*; D007210:Indoleacetic Acids / Q000032:analysis; D009844:Oligosaccharides; D009195:Peroxidase / Q000032:analysis; D014026:Nicotiana / Q000166:cytology* / Q000187:drug effects / Q000254:growth & development
chemical_list: D005456:Fluorescent Dyes; D007210:Indoleacetic Acids; D009844:Oligosaccharides; C493484:oligochitosan; D002686:Chitin; D005063:Europium; C030737:indoleacetic acid; D048271:Chitosan; D009195:Peroxidase