Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Martin Luther University of Halle-Wittenberg, Halle, Germany.|Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Martin Luther University of Halle-Wittenberg, Halle, Germany.|Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Martin Luther University of Halle-Wittenberg, Halle, Germany.