1. Rothamsted Research Harpenden, Hertfordshire,AL5 2JQUK
2. Plant & Crop Sciences School of Biosciences University of Nottingham Sutton Bonington,LE12 5RDUK
3. Department of Abiotic Stress and Plant Pathology Centro de Edafología y Biología Aplicada del Segura (CSIC) Murcia Spain
4. Laboratory of Growth Regulators,Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany Czech Academy of Sciences OlomoucCZ‐783 71Czech Republic
5. Faculty of Science Palacký University OlomoucCZ‐783 71Czech Republic