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本文旨在采用 NC 遗传交配设计 ,通过在武汉的两年试验研究 10份 CIMMYT群体与我国骨干玉米自交系之间的杂种优势关系 ,以探讨利用外来种质拓宽我国玉米种质遗传基础的途径。试验结果表明 :在与我国优良骨干自交系交配的组合中 ,群体 Stay green、群体 4 3- C11和群体 2 1- C2三个群体穗部性状表现较好 ,单株产量一般配合力高 ,表现出较高的利用潜力。在供试的 5 0份组合中 ,有13份组合的对照优势为正值 ,其中涉及到含有 Tuxpeno血缘的 3个群体 (群体 4 3- C11、群体 2 1- C2、群体 4 9- C6)的组合达 8份 ,占 61.5 4 %。在 4份强优势组合中 ,群体 4 3- C11和群体 2 1- C2参与形成的有 3份。这些结果暗示我国现有的优良种质与 Tuxpeno种质的配对有可能组成具有较大潜力的杂种优势模式。A8833和 A92 4 5群体诸性状一般配合力表现较差 ,与供试的我国骨干玉米自交系的杂种优势较低。群体 32、基因库 19- C19、黄粒综合种 C3和 P5 0 0四个群体农艺性状一般配合力表现中等 ,产量一般配合力不高 ,但可以作为特殊种质资源加以利用。本文的研究结果为有效利用这批外引种质提供了重要信息
In this paper, the NC genetic mating design was adopted to study the heterosis relationship between 10 CIMMYT populations and the backbone maize inbred lines in China through two-year experiments in Wuhan in order to explore ways to expand the genetic basis of maize germplasm using foreign germplasms . The results showed that the three populations of Stay green, population 4 3- C11 and population 2 1- C2 had better performance of panicle traits, higher combination of yield per plant, Showing a higher potential for utilization. Of the 50 combinations tested, 13 of the combinations had a positive control advantage, which involved 3 populations with Tuxpeno bloodline (population 4 3-C11, population 2 1-C2, population 4 9-C6) Of the portfolio up to 8, accounting for 61.5 4%. Of the 4 strong-performing combinations, 3 in groups 4 3-C11 and 2 2-C2 were formed. These results suggest that the existing good germplasm in China and the pairing of Tuxpeno germplasm may constitute a heterosis model with great potential. The general combining ability of A8833 and A92 4 5 populations showed poor performance, which was lower than that of the tested backbone maize inbreds. Population 32, GenBank 19-C19, Agrobacterium tumefaciens C3 and P5 0 0 had moderate agronomic traits with medium combining ability and low yielding ability, but could be used as special germplasm resources. The results of this study provide important information for the effective use of these exotics