以互不等位的半矮秆、正常高秆与隐性高秆水稻杂交，研究表明：隐性高秆由隐性的长节间基因ｅｕｉ所决定，除了ｅｕｉ基因之外，隐性高秆还含有ｓｄ１基因，ｅｕｉ与ｓｄ１相互独立．隐性高秆和有ｓｄ１基因的半矮秆杂交Ｆ２表现３半矮∶１高，而与非ｓｄ１基因的半矮秆杂交Ｆ２表现３对基因的互作．２个隐性高秆相互杂交表明它们携带的长节间基因是相同的．讨论了长节间基因在籼粳杂交育种中的利用途径 The results showed that the recessive tall stalk was determined by the recessive internode gene eui. In addition to the eui gene, the recessive tall stalk Also contains sd 1 gene, eui and sd 1 independent of each other. Semi-dwarf hybrid F2 with recessive stalk and sd1 gene showed 3 semi-dwarf: 1 high, whereas F2 with semi-dwarf cross with non-sd1 showed 3-gene interaction. Two recessive stalks hybridized to each other indicate that they carry the internode genes are identical. This paper discussed the ways of using the internode gene in indica-japonica cross breeding