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中国玉米Lancaster杂种优势群中LancasterSurecrop(LSC)种质主要来自Mo17和Oh4 3,且受到C10 3和Oh4 0B的严重限制。该群大多数自交系的LSC种质含量≤ 5 0 % ;同时存在 2 0多种非LSC种质 ,它们是Lancaster杂种优势群具有丰富遗传多样性的重要原因。Mo17亚群的大多数自交系含有 2 5 %～ 5 0 %的LSC种质 ,12 .5 %～ 2 5 %的ReidYellowDent(RYD)种质和 12 .5 %～ 2 5 %的IowaGoldmine种质 ,其比例为 2∶1∶1;而自 330亚群的大多数自交系含有 12 .5 %～2 5 %的LSC种质 ,6 .2 5 %～ 12 .5 %的RYD种质 ,6 .2 5 %～ 12 .5 %的Minnesota # 13种质和 2 5 %～ 5 0 %的Creole种质 ,其比例为 2∶1∶1∶4。可见 ,Lancaster杂种优势群自交系的种质基础发生了惊人的变化 ,Lancaster杂种优势群己脱离了纯LancasterSurecrop种质。
The LancasterSurecrop (LSC) germplasm in the Lancaster heterotic cluster of Chinese maize is mainly derived from Mo17 and Oh4 3, and is severely limited by C10 3 and Oh4 0B. LSC germplasm content of most inbred lines of this group was ≤50%. There were more than 20 non-LSC germplasms at the same time, which were the important reasons for the rich genetic diversity of Lancaster heterotic population. Most inbred lines of the Mo17 subpopulation contained 25% to 50% of LSC germplasm, 12.5% to 25% of Reid Yellow Dent (RYD) germplasm and 12.5% to 25% of Iowa Goldmine germplasm , With a ratio of 2: 1: 1. Most inbred lines from the 330 subgroup contained 12.5% -2.5% of LSC germplasm, 6.5-2.5% of RYD germplasm, 6 2.5 to 12.5% Minnesota # 13 germplasm and 25% to 50% Creole germplasm in a ratio of 2: 1: 1: 4. It can be seen that the Lancaster heterotic group inbred line germplasm base has undergone dramatic changes, Lancaster heterotic group has been separated from the pure LancasterSurecrop germplasm.