Institution: | Plant Science Division, School of Biological Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK; Present address: Unilever Research Colworth Laboratory, Colworth House, Sharnbrook, Bedford MK44 1LQ, UK; Corresponding author; Fax: +44 115 951 6334; E-mail: Donald. Grierson@nottingham.ac.uk |