1. Institute for Plant Genetics, University of Hannover, Herrenhäuser Strasse 2, D-30419 Hannover, Germany, Department of Agronomy, Forestry and Agronomy Faculty, University of Pinar del Río, Cuba, Institute of Computational Chemistry, University of Girona, Catalonia, Spain, and Department of Inorganic and Physical Chemistry, Ghent University, Ghent, Belgium