In this paper we have used the double heterozygote as female parent and the good line as male parent in cross and backcross.

• 然而，以双杂合体为母本，优良自交系为父本，二者杂交或进行回交，再在杂种后代中选准双杂合体做母本，继续进行自交或回交，是较快而有效的方法。