Effects of fly net separating on pollen flow of rice

A restorer line rice Ce64-7 and a male sterile rice Zhenshan 97A were used as materials，the effects of fly net separating on pollen flow of rice were studied. The results showed that fly nets with 200 mesh，300 mesh and 400 mesh all could affect the frequency of pollen flow，but there was no significant difference among the three nets. Frequency of pollen flow was closely related to wind direction，the frequency of pollen flow in down-wind direction was significantly higher than that in up-wind direction，but frequency in the two directions showed no significant difference after fly net separating. The overall trend of drift frequency was the same in the four treatments，the drift frequency decreased with the increase of distance. Results indicated that during the prime seed production period，we should use fly net with 300 mesh.