[1] Westfalische Wilhelms Univ Munster, Inst Plant Biol & Biotechnol, D-48143 Munster, Germany
[2] Rheinische Friedrich Wilhelms Univ Bonn, Inst Crop Sci & Resource Conservat INRES, D-53113 Bonn, Germany
[3] Lund Univ, Dept Biol, S-22362 Lund, Sweden
[4] Rheinische Friedrich Wilhelms Univ Bonn, Inst Cellular & Mol Bot IZMB, D-53115 Bonn, Germany