1. Department of Agricultural Education, Suncheon National University, Suncheon, South Korea
2. Department of Horticulture, Kyungpook National University, Daegu, Korea
3. Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York, USA
4. Department of Horticulture, Sunchon National University, Suncheon, South Korea
5. Department of Landscape Architecture, Kyungpook National University, Daegu 41566, Korea
6. US Department of Agriculture/Agriculture Research Service, Robert W. Holley Centre for Agriculture and Health, Ithaca, New York, USA