Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de|Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstr, 3, 06466 Gatersleben, Germany. weise@ipk-gatersleben.de