1. Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture/Northeast Agricultural Univ.; Harbin CN-150030 Heilongjiang PR China
2. College of Horticulture and Landscape Architecture, Northeast Agricultural University; Harbin, Heilongjiang PR China
3. College of Science, Northeast Agricultural Univ.; Harbin, Heilongjiang PR China
4. Inst. of Botany, Chinese Academy of Sciences; Beijing PR China
5. College of Life Science, Northeast Agricultural Univ.; Harbin, Heilongjiang PR China