title: Identification of cytokinins produced by the plant parasitic nematodes Heterodera schachtii and Meloidogyne incognita.
abstract: SUMMARY The presence of different types of cytokinins was analysed in exudates and lysates of stage-2 juveniles of Heterodera schachtii and Meloidogyne incognita and in mixed stages of Caenorhabditis elegans. For all species, cytokinins were detected in lysates and exudates in which benzyladenine and zeatin-type cytokinins were the most prominent forms. The production of cytokinins by Meloidogyne was much higher than by Heterodera, and the detected levels were in a range which interfered with the physiological activities of the host plant. The presence of 5-methoxy-N,N-dimethyltryptamine hydrogen oxalate did not affect hormone production by H. schachtii, whereas resorcinol slightly stimulated hormone production by M. incognita. The exuded cytokinins may play a role in feeding site induction, more particularly in cell cycle activation and in establishing the feeding site as a nutrient sink.
authors.affiliation: Vakgroep Moleculaire Genetica, Departement Plantensysteembiologie, Vlaams Interuniversitair Instituut voor Biotechnologie (VIB), Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium;
authors.forename: Jan
authors.initials: J
authors.lastname: De Meutter
authors.forename: Tom
authors.initials: T
authors.lastname: Tytgat
authors.forename: Erwin
authors.initials: E
authors.lastname: Witters
authors.forename: Greetje
authors.initials: G
authors.lastname: Gheysen
authors.forename: Henri
authors.initials: H
authors.lastname: Van Onckelen
authors.forename: Godelieve
authors.initials: G
authors.lastname: Gheysen