Abstract:4 recurrent selection basic breeding populations-WBMCo, WLSCo, LBMCo and LLSCo (character 1-Chinese South west germplasm;character 2-American germplasm;characte 3-torrid and semitorrid zone germplasm) were synthesized using American germplasm of Stiff Stalk Synthctic BSSSC9 (B)、Lancaster (Lan),Mes