1. Institute of Plant Genetics and BreedingSchool of Biological Technology and EngineeringGuizhou Normal University Baoshan Beilu 116 Guiyang P.R. China 550001
2. Technical Univ. of MunichLehrstuhl fuer Pflanzenbau und Pflanzenzuechtung Lange Point 51 Freising‐Weihenstephan Germany D‐85350