Fertility Instability and Its Effection on Yield in Cytoplasmic Male-Sterile Hybrid Rapeseed (Braissic napus.L)

Three cytoplasmic male-sterile hybrid rapeseeds (Braissic napus.L)were tested to estimate their fertility instability and its effection on the yield of hybrids.The results showed that all the three hybrids showed different fertility instability which was already related to the changes in flower organs. The percentage of male-sterile plants in these F1 hybrids reached 5%,3%,11%,respectively. Number of effective pods were fewer in male-sterile plant; Yield of per plant in sterile plants were 11.42%,10.45%,5.73% as compared with normal hybrid plants. Therefore, yields of the three hybrids dropped by 8.60%,13.93%,17.38% ,respectively.