Affiliation: | (1) Department of Plant Sciences, University of Cambridge, CB2 3EA Cambridge, UK;(2) Pflanzenphysiologisches Institut der Universität Göttingen, D-3400 Göttingen, Germany;(3) Present address: Department of Plant Physiology, Horticulture Research International, East Mailing, West Mailing, ME19 6BJ Kent, UK |