The cross-compatibility (seed set and pollen viability) between maize (inbred and hybrid) and it relatives (including annual and perennis) as well as its introgression hybridization progenies were investigated. The results shown that maize relatives of genus Zea can be directly crossed with maize, and grained F1 seeds. Maize relatives and their interspecies hybrids have strong heterosis photoperiod response. The cross-compatibility of their interspecies hybrid was affected remarkable by different female parent. Furthermore, For the introgression of desirable characters from maize relatives into maize, there are considerable genetic and breeding materials were achieved.
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