[Sex control of silkworm by the interaction between gene and environment].

The silkworm embryo of the varieties, sBan, K05, Ban1, S1 and D05 was sensitive to the high temperature and low humidity incubating condition, while that of Nong4, Xinjiu and Xiankang was more endurable. By crossing the female Xinjiu with the male of sensitive varieties, such as sBaa, K05, Ban1, S1 or D05, their female progenies were sensitive to the high temperature and low humidity during incubation and could not hatch, while the males could hatch normally. Experiment showed that silkworm sex could be controlled by the interaction between gene and environment. The sensitive period was at late stage during the embryo development. The RAPD analysis showed that the similarity index of the five temperature-sensitive varieties of sBan, K05, Ban1, S1 and D05 was 63.04-76.47%.