[1] University of Bonn, Faculty of Agriculture, Institute of Crop Science and Resource Conservation (INRES), Karlrobert-Kreiten-Strasse 13, Bonn,53115, Germany
[2] Africa Rice Center (AfricaRice), 01 B.P. 2551, Bouaké
[3] Centre National de la Recherche Scientifique et Technologique (CNRST), Institut de l'Environnement et de Recherches Agricoles (INERA), 01 B.P. 910, Bobo Dioulasso, Burkina Faso
[4] International Rice Research Institute (IRRI), DAPO Box 7777, Metro Manila,1301, Philippines