1. Horticulture Research International, Wellesbourne, Warwick CV35 9EF, United Kingdom (A.J.T., M.T., G.B.S.)
2. Plant Science Division, School of Biological Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, United Kingdom (C.S.B., D.G.)
3. Department of Horticultural Sciences, Texas A&M University, College Station, Texas 77843–2133 (J.V., J.J.G.)
4. Centre for Plant Biochemistry and Biotechnology, University of Leeds, Leeds LS12 9JT, United Kingdom (C.O.)
5. Chemistry Department, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom (M.C.J.)