Affiliation: | 1. Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka 599‐8531, E‐mail: tezuka@plant.osakafu‐u.ac.jp;2. Plant Biotechnology Institute, Ibaraki Agricultural Center, Kasama, Ibaraki 319‐0292;3. Agriculture and Forestry Office of Western Ibaraki, Chikusei, Ibaraki 308‐0841;4. Ibaraki Agricultural Academy, Ibaraki Agricultural Center, Higashi‐ibaraki‐gun, Ibaraki 311‐3116, Japan |