Affiliation: | (1) John Innes Institute, Colney Lane, NR4 7UH Norwich, UK;(2) Present address: Den kgl Veterinær- og Landbohøjskole, Institut for Plantefysiologi, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark;(3) Department of Plant Biology and Genetics, University of Hull, HU6 7RX Hull, UK |