About the Authors
Department of Biology and Zurich-Basel Plant Science Center, ETH Zurich, Zurich, Switzerland
Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
Institute of Plant Biology and Zurich-Basel Plant Science Center, University of Zurich, Zurich, Switzerland
The authors have declared that no competing interests exist.
Designed experiments, analyzed results, and wrote the manuscript: AJJ WG. Helped with experimental work and drafting of the manuscript: OK TR. Contributed confocal images: PJB. Contributed marker lines: JMM RB. Provided advice and material from his laboratory: UG. Contributed to the final version of the manuscript: AJJ OK PJB TR JMM RB UG WG.