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*Yoshihisa Suyama
Graduate School of Agricultural Science, Tohoku University
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Tomoyuki Saitoh
Kiso Experiment Station, Forestry and Forest Products Research Institute
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Aya Nishiwaki
Faculty of Agriculture, University of Miyazaki
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Akifumi Makita
Faculty of Bioresource Sciences, Akita Prefectural University
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Shozo Shibata
Field Science Education and Research Center, Kyoto University