1. Dep. of Plant Production; College of Agric. at Saba Basha, Univ. of Alexandria; Bolkly 21531 Alexandria Egypt
2. Dep. of Plant Cell Biotechnology; Central Food Technological Research Inst.; Mysore 570013 India
3. 111 Koshland Hall, Dep. of Plant and Microbial Biology; Univ. of California; Berkeley CA 94720-3102