1. Japan International Research Center for Agricultural Sciences 1‐1 Ohwashi Tsukuba Ibaraki 305‐8686 Japan
2. Tokyo Univ. of Agriculture 1‐1‐1 Sakuragaoka, Setagaya Tokyo 156‐8502 Japan
3. International Institute of Tropical Agriculture PMB 5320 Ibadan Oyo State Nigeria
4. Purdue Univ. 915 W State St. West Lafayette IN 47907 USA
5. Iwate Biotechnology Research Center 22‐174‐4 Narita Kitakami Iwate 024‐0003 Japan
6. La Trobe Univ. AgriBio Building, 5 Ring Road Bundoora Melbourne VIC 3086 Australia
7. Kyoto Univ. 1 Nakajou, Mozume‐cho Muko Kyoto 617‐0001 Japan