Affiliation: | (1) Present address: Botanisches Institut, Ludwig Maximillian Universität, Menzingerstrasse 67, D-80638 München, Germany;(2) Present address: Plant Cell Biology, Lund University, Box 7007, S-220 07 Lund, Sweden;(3) Department of Plant Breeding Research, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7003, S-75007 Uppsala, Sweden |