1. Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable CropsChina Agricultural University Beijing 100193 China
2. Plant Science and Technology CollegeBeijing University of Agriculture/New Technological Laboratory in Agriculture Application in Beijing Beijing 102206 China
3. College of Horticulture Science and Engineering/State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huanghuaihai RegionShan Dong Agricultural University Taian Shandong 271018 China