1. Dep. of Horticulture and Landscape Architecture Heilongjiang Bayi Agricultural Univ. Daqing Heilongjiang Province 163309 China
2. Daqing Branch Heilongjiang Academy of Agricultural Sciences Daqing Heilongjiang 163316 China
3. Dep. of Horticulture Northeast Agricultural Univ. Harbin Heilongjiang Province 150030 China