Cross incompatibility in Zea mays is controlled gametophytically by a single locus. The gametophyte gene is located on chromosome 4 in maize.
玉米的杂交不亲和性是受单基因控制的，为配子体控制型，该基因位于玉米的第四染色体上。
2
Studies of effects of S genes on self-incompatibility in phanerogam have been the focus since the first S gene (S-locus glycoprotein, SLG) was identified.