2.1. Collection of sweet sorghum samples
Total 63 sweet sorghum germplasm accessions collected worldwide
were grown in Hubei experimental field in 2011, and the
mature stalks were harvested from 90 to 140 days after sowing.
The stalks tissues were dried at 50 C for 36 h after inactivation
at 105 C for 20 min, ground into powders through a 40 mesh