title: Isolation, characterization and expression of cyclin and cyclin-dependent kinase genes in Jerusalem artichoke (Helianthus tuberosus L.).
abstract: Tuber explants of Jerusalem artichoke (Helianthus tuberosus L.) are a model system for cell-cycle re-entry from a quiescent state, involving the activation of division of tuber parenchyma cells in response to exogenous auxin. To enable molecular studies of this system, two cyclin (Heltu;CYCD1;1 and Heltu; CYCD3;1) and two cyclin-dependent kinase (Heltu; CDKA;1 and Heltu;CDKB1;1) genes have been isolated from a Jerusalem artichoke cDNA library and their expression demonstrated during the activation of cell division. It was found that CDKA;1 transcripts are present in quiescent tubers, whereas CYCD1;1, CYCD3;1 and CDKB1;1 transcripts are induced during cell-cycle re-entry as well as during bud growth of whole tubers. Both CYCD1;1 and CYCD3;1 transcripts appear shortly before, or coincident with, the onset of S phase.
authors.affiliation: Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK.
authors.forename: Donna
authors.initials: D
authors.lastname: Freeman
authors.forename: Catherine
authors.initials: C
authors.lastname: Riou-Khamlichi
authors.forename: E Ann
authors.initials: EA
authors.lastname: Oakenfull
authors.forename: James A H
authors.initials: JA
authors.lastname: Murray
mesh_terms: D056741:Cyclin D; D018844:Cyclin-Dependent Kinases / Q000235:genetics*; D016213:Cyclins / Q000235:genetics*; D015870:Gene Expression; D006368:Helianthus / Q000201:enzymology / Q000235:genetics*; D016196:S Phase
chemical_list: D056741:Cyclin D; D016213:Cyclins; D018844:Cyclin-Dependent Kinases