Breeding of New Sugarbeet Variety Tianyan 311

New sugarbeet variety,Tianyan 311(original code: HTP02),was crossed from a polyembryony tetraploid line TP-3 as the female parent with 4 polyembryony diploid lines(DP08,DP02,DP03 and DP04 crossing by 2:1:1:1) as the male parent through natural pollination as 3:1.In both Heilongjiang sugarbeet variety regional experiment and demonstration experiment during the years of 2005 to 2008,the mean root yield was 39576.2 kg/ha and 47501.7 kg/ha,increased by 11.9% and 21.7%,the sugar content was 16.8% and 17.4%,increased by 0.5°S and 1.0°S,the sugar yield was 6725.4 kg/ha and 8348.9 kg/ha,increased by 15.9% and 30.4% in comparison with the control variety,respectively.The new variety has shown a good resistance to leafspot and tolerance to root rot.It was suitable to plant in the Mudanjiang,Qiqihaer,Daqing and Harbin areas of the Heilongjiang province.