Key Laboratory of Soybean Biology Ministry of Education/Soybean Research Institute Northeast Agricultural University Harbin 150030 P.R.China;
College of Agronomy Heilongjiang Bayi Agricultural University Daqing 163311 P.R.China;
London Research and Development Center Agriculture and Agri-food Canada London N5V 4T3 Canada;
College of Resources and Environment Northeast Agricultural University Harbin 150030 P.R.China;