title: Somaclonal variation in watercress for resistance to crook root disease.
abstract: Watercress (Rorippa nasturtium-aquaticum) shoots were regenerated from callus initiated from petioles on a range of media. The best coefficient of regeneration was obtained when callus was induced on a medium containing 0.25 mgl(-1) thidiazuron and 0.05 mgl{si-1} 2,4-D, followed by regeneration on 0.25 mgl(-1) thidiazuron. Plants were then screened for resistance to crook root disease of watercress in a laboratory screening test which revealed significant somaclonal variation between the controls and some of the somaclones.
authors.affiliation: School of Biological Sciences, University of Bath, BA2 7AY, Claverton Down, Bath Avon, UK.
authors.forename: D L
authors.initials: DL
authors.lastname: Arnold
authors.forename: A
authors.initials: A
authors.lastname: Flegmann
authors.forename: J M
authors.initials: JM
authors.lastname: Clarkson