玉米Tuxpeno-Reid和Suwan-Lancaster合成群体相互轮回选择效果及杂种优势研究

Two Maize Populations of Tuxpeno-Reid and Suwan-Lancaster by Reciprocal Recurrent Selection and the Heterosis

采用属Reid自交系和属Tuxpeno自交系形成墨瑞C0以及用属Suwan自交系、Mo17和78599形成苏兰C0。两个群体在4次遗传平衡后按半同胞相互轮回选择后分别形成改良一轮的墨瑞C1和苏兰C1。经多点产量比较,墨瑞C1×苏兰C1比墨瑞C0×苏兰C0的产量提高7.84%,达到极显著水平,而两个群体本身的产量变化不显著。群体间的平均杂种优势也从改良前的9.86%提高到改良后的16.29%。根据SSR标记计算,相互轮回选择对群体间的遗传距离略有提高。

Two populations of Tuxpeno-Reid and Suwan-Lancaster were developed from five Reid and four Tux- peno inbreds, six Suwan inbreds, Mo17 and 78599 by four times random mating respectively. After one cycle of recip- rocal recurrent selection, mean yield of Tuxpeno-Reid（Co） × Suwan-Lancaster（Co） was increased highly significant from 8.064 kg per plot to 8.696 kg of Tuxpeno-Reid（C1） × Suwan-Lancaster（C1）, and mid-parent heterosis increased from 9.86% to 16.29%, and genetic distance by SSR between two populations increased slightly.