Two BC1 clones,Yunnan 06-278 and Yunnan 06-279 from intergeneric cross Saccharum officinarum × Erianthus rockii were studied on chromosome karyogram by root tip slice and light microscopy technology. The results showed that both of the two BC1 clones had the same somatic chromosome number 2n = 110. The karyotpye formulae of Yunnan 06-278 and Yunnan 06-279 were respectively as follows: 2n= 110 = 116 m + 4sm as 2B type and 2n = 110 = 102 m + 8sm as 2C type. According to the somatic chromosome number we made i...