1. Graduate School of Agricultural Science Kobe University Nada‐ku, Rokkodai 1‐1 Kobe657‐8501Japan
2. Japanese Apricot Laboratory Wakayama Fruit Tree Experiment Station Minabe, Higashi‐honjo 1416‐7 Wakayama645‐0021Japan
3. Graduate School of Environmental and Life Science Okayama University Kita‐ku, Tsushima‐naka 1‐1‐1 Okayama700‐8530Japan