The full length osRACD cDNA sequence was subcloned into the pBI121 plasmid in the antisense orientation under the control of the CaMV35S promoter to construct the expression vector pBID, and the constructs were introduced into Arabidopsis plants by using the vacuum infiltration method. The siliques of the transformants stopped growing after anthesis, and they turned yellow or died later; and the siliques from the control plants transformed by the pBI continued growing after anthesis and matured normally. In -vitro pollen germination demonstrated that the growth and elongation process of the pollens of the transgenic plants was inhibited, the pollen tubes were shorter and slightly fatter than the tubes of the control plants, which grew normally with long cyclindrical tubes. The above results suggest the function of osRACD gene involved in regulation of the growth and elongation process of pollen tube, its encoding protein may be one of the important factors in regulation of fertility transition of the ph The full length osRACD cDNA sequence was subcloned into the pBI121 plasmid in the antisense orientation under the control of the CaMV35S promoter to construct the expression vector pBID, and the constructs were introduced into Arabidopsis plants by using the vacuum infiltration method. The siliques of the transformants stopped growing after anthesis, and they turned yellow or died later; and the siliques from the control plants transformed by the pBI continued growing after anthesis and matured normally. In -vitro pollen germination prototype that the growth and elongation process of the pollens of the transgenic plants was inhibited, the pollen tubes were shorter and slightly fatter than the tubes of the control plants, which grew normally with long cyclindrical tubes. The above results suggest the function of osRACD gene involved in regulation of the growth and elongation process of pollen tubes, its encoding protein may be one of the important factors in regulation of fertility tr ansition of the ph