Abstract: Wide compatibility rice varieties(WCVs) LH422 and 02428,Indica and Japonica rice varieties were used in this test with cross-combination types.The seedset values of F1 hybrids were determined,and the pollen activities of the parent lines and F1 hybrids were also inspected with microscope.The results showed that the pollen fertilities of the parent lines reached a competitive higher level except those of Ce49,but the pollen fertilities of F1 hybrids varied according to their parent lines.The pollen fertilities of F1 hybrids which were cross-combined by WCVs and Indica or Japonica rice varieties were the highest among all the combinations.The correlation coefficience of the pollen sterilities and the unfilled grain rate reached 0.838 0.

Key words: WCVs, seedset, pollen activities, F1 hybrids