(6) Use of female plant line( in spinach,菠菜) Full female lines; High-degree female line(maintainer) Perfect lines Full female x perfect -----FI hybrid (7) Use of male plant line( In asparagus,芦笋) XX ---female line XY ---male line YYline--- Super male line XX X YY-----XY(FI hybrid, Male) (8) Use of female line( in cucumber,黄瓜) Full female line Normal line(female flower male flower) Full female line x Normal line ----FI hybrid(6) Use of female plant line (in spinach, 菠菜) Full female lines; High-degree female line(maintainer) Perfect lines Full female x perfect -----F1 hybrid (7) Use of Male plant line (in asparagus，芦笋) XX line ---female line XY line --- male line YY line --- Super male line XX x YY ----- XY (F1 hybrid, Male) (8) Use of female line (in cucumber，黄瓜) Full female line Normal line (female flower + male flower) Full female line x Normal line ---- F1 hybrid