State Key Lab of Crop Genetics and Germplasm Enhancement;
College ofAgriculture;
Nanjing Agricultural University;
Nanjing 210095;
China;
Department of Agrobiodiversity;
Institute of Crop Science;
University of Kassel;
34109 Kassel;
Germany;
and Leibniz Institute of Plant Genetics and Crop Plant Research (IPK);
Corrensstr. 3;
06466 Gatersleben;
Germany;