1. Experimental Farm; National Institute of Genetics (NIG); Mishima Shizuoka 411-8540 Japan
2. Plant Genetics Laboratory; NIG; Mishima Shizuoka 411-8540 Japan
3. Mitsubishi Space Software Co., Ltd; Tsukuba Ibaraki 305-0032 Japan
4. Yale Stem Cell Center and Department of Cell Biology; School of Medicine; Yale University; New Haven CT 06520 USA
5. Department of Life Science; Graduate University for Advanced Studies/Sokendai; Mishima Shizuoka 411-8540 Japan