Analysis with diallel, NC-II design and molecular markers (RFLP, SSR and RAPD) reveal that most of predominant inbred lines can be clustered into 3 heterotic groups or 5 sib-groups. The first group named Dom is of domestic germplasm, and consists of Sipingtou and Luda Red Cob sub-groups. The second group is of Lancaster germplasm. The third group consists of Reid and PN germplasm, and named Reid. The predominant heterotic patterns can be summarized as Dom x Lan or Dom x Reid. Luda Red Cob x Lan is the predominant pattern in Spring Maize Area in north China. Sipingtou x PN is used in Summer Maize Area. Heterotic pattern used in south provinces has not been established. Maize breeders tend to produce cross combinations between local germplasm and exotics, and the patterns are usually of dent x flint type.
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机译：用Dialelel，NC-II设计和分子标记（RFLP，SSR和RAPD）进行的分析显示，大多数主要近交系可以聚集成3个杂种组或5个同胞组。第一组命名为Dom，属于国内种质，由四平头和鲁达红芯子亚组组成。第二类是兰开斯特种质。第三组由里德（Reid）和PN种质组成，命名为里德（Reid）。主要的杂种模式可以概括为Dom x Lan或Dom x Reid。 Luda Red Cob x Lan是中国北方春玉米地区的主要模式。 Sipingtou x PN用于夏季玉米种植区。尚未建立在南部省份使用的杂种模式。玉米育种者倾向于在本地种质和外来种之间产生交叉组合，其模式通常为凹痕x火石型。
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