近缘单交种对协调玉米制种花期效果的研究

利用１９个黄早四改良系与单交种西农１１号的亲本之一的西黄改组成近缘单交种作母本与西农１１号的另一亲本ＷＮ１１配成三交种，以研究近缘单交种对协调玉米制种花期的效果。结果表明：近缘单交种的吐丝期均比西黄改吐丝期提前，并能与ＷＮ１１散粉期相遇；用近缘单交种配制的有些三交种产量高于或与原单交种相当，且主要农艺性状较为整齐。

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.