title: Comparative field performance over 3 years and two sites of transgenic wheat lines expressing HMW subunit transgenes.
abstract: A series of transgenic wheat lines expressing additional high molecular weight (HMW) subunit genes and the corresponding control lines were grown in replicate field trials at two UK sites (Rothamsted Research, approximately 50 km north of London and Long Ashton, near Bristol) over 3 years (1998, 1999, 2000), with successive generations of the transgenic lines (T3, T4, T5) being planted. Four plots from each site were used to determine grain dry weight, grain nitrogen, dough strength (measured as peak resistance by Mixograph analysis) and the expression levels of the endogenous and "added" subunits. Detailed statistical analyses showed that the transgenic and non-transgenic lines did not differ in terms of stability of HMW subunit gene expression or in stability of grain nitrogen, dry weight or dough strength, either between the 3 years or between sites and plots. These results indicate that the transgenic and control lines can be regarded as substantially equivalent in terms of stability of gene expression between generations and environments.
authors.affiliation: Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK. peter.shewry@bbsrc.ac.uk
authors.forename: Peter R
authors.initials: PR
authors.lastname: Shewry
authors.forename: Stephen
authors.initials: S
authors.lastname: Powers
authors.forename: J Michael
authors.initials: JM
authors.lastname: Field
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Fido
authors.forename: Huw D
authors.initials: HD
authors.lastname: Jones
authors.forename: Gillian M
authors.initials: GM
authors.lastname: Arnold
authors.forename: Jevon
authors.initials: J
authors.lastname: West
authors.forename: Paul A
authors.initials: PA
authors.lastname: Lazzeri
authors.forename: Pilar
authors.initials: P
authors.lastname: Barcelo
authors.forename: Francisco
authors.initials: F
authors.lastname: Barro
authors.forename: Arthur S
authors.initials: AS
authors.lastname: Tatham
authors.forename: Frank
authors.initials: F
authors.lastname: Bekes
authors.forename: Barbara
authors.initials: B
authors.lastname: Butow
authors.forename: Helen
authors.initials: H
authors.lastname: Darlington
mesh_terms: D001947:Breeding; D015870:Gene Expression; D042822:Genomic Instability; D005983:Glutens / Q000737:chemistry / Q000235:genetics; D008970:Molecular Weight; D030821:Plants, Genetically Modified; D021122:Protein Subunits; D012639:Seeds / Q000737:chemistry / Q000254:growth & development; D014908:Triticum / Q000737:chemistry / Q000235:genetics* / Q000254:growth & development
chemical_list: D021122:Protein Subunits; D005983:Glutens; C037302:glutenin