5Sarkar K R,Coe E H. A genetic analysis of the origin of mater-nal haploids in maize [J]. Genetics, 1969 ,54 :453-464.
6CKalyk S T. Properties of maternal haploid maize plants andpotential application to maize breeding [J]. Euphytica, 1994 ,79:13-18.
7Rober F K,Gordillo G A,Geiger, H H. In vivo haploid induc-tion in maize-performance of new inducers and significance dfdoubles haploid lines in hybrid breeding [J]. Maydica,2005,50:275-283.
8Chase S S. Monoploids and diploids of maize: A comparison ofgenotypic equivalents [J]. Amer J Bot, 1964 ,51 : 928-933.
9Chase S S. Monoploids and monoploid derivatives of maize {Zeamays L. ) [J]. Bot Review’ 1969 ,35 : 117-168.
10Seaney R R. Monoploids in maize [J]. Maize Genet Coop NewsLett,1954,28:22.