Affiliation: | 1. Donan Agricultural Experiment Station, Hokkaido Research Organization, Hokuto, Hokkaido, 041-1201, Japan 2. National Agriculture and Food Research Organization, Institute of Vegetable and Tea Science, Tsukuba, Ibaraki, 305-8666, Japan 3. Kitami Agricultural Experiment Station, Hokkaido Research Organization, Kun-Neppu, Hokkaido, 099-1496, Japan 4. Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, 061-0293, Japan
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