A photo-thermosensitive sterile material was found from genetic male sterility (GMS) line 05S in Chinese mustard (?Brassica juncea?) in 1997, and in 1999 it was selected further into a photo-thermosensitive GMS line named K121S.

• 1997年在芥菜型油菜(B.；juncea)隐性核不育材料05S姊妹交后代中发现具光温敏感特性的不育材料；于1999年育成光温敏核不育系K121S。