Affiliation: | (1) Broom's Barn Experimental Station, Higham, Bury St. Edmunds, IP28 6NP Suffolk, UK;(2) Department of Plant Sciences, University of Oxford, OC1 3RB Oxford, UK;(3) Broom's Barn Experimental Station, Bury St. Edmunds, IP28 6NP Oxford, UK;(4) Dept of Applied Biology and Biotechnology Attenborough Laboratories, Leicester Polytechnic, LE7 9SU Leicester, UK |