1. Laboratory of Pollen Biology; Institute of Experimental Botany; Academy of Sciences of the Czech Republic; Prague Czech Republic
2. Department of Plant Experimental Biology; Faculty of Science; Charles University in Prague; Prague Czech Republic
3. Applied Biochemistry Group; Department of Physiology and Cell Biology; Leibniz Institute of Plant Genetic and Crop Plant Research; Gatersleben Germany
4. Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V.; Dortmund Germany