Effect of close-relative single crosses on flowering coordination during seed corn production

Each of the nineteen improved lines of Huangzao 4 was crossed with Xihuang gai, which is one parent of single cross Xinong No.11,to produce the close relative crosses.These close relative crosses were crossed as female parent with WN 11 ,which is another parent of Xinong No.11,to produce tricrosses.All of materials were planted to study the effect on flowering coordination during seed corn production.The results showed that silking stage of close relative single crosses was earlier than of Xihuanggai,and met with shedding stage of WN 11 .Yield of several tricrosses was higher than of simillar to normal single cross,and main agronomic traits of them showed no difference.