1. C. N. Fokunang:
School of plant Sciences, University of Reading. P.O. Box 221, Whiteknights, Reading, RG6 6AS, United Kingdom
2. J. M. Dunwell:
School of plant Sciences, University of Reading. P.O. Box 221, Whiteknights, Reading, RG6 6AS, United Kingdom
3. K. A. Watson:
School of plant Sciences, University of Reading. P.O. Box 221, Whiteknights, Reading, RG6 6AS, United Kingdom
4. N. H. Battey:
School of plant Sciences, University of Reading. P.O. Box 221, Whiteknights, Reading, RG6 6AS, United Kingdom
5. J. L. Beynon:
Horticultural Research Institute (HRI), Wellesbourne, Warwick, UK
6. E. A. Tembe-Fokunang:
Pfizer Limited, Global Research and Development, Sandwich, Kent, CT13 OBA, UK