文献类型： 外文期刊

作者： Yi, Qiang ¹ ; Zhang, Kaiwu ² ; Peng, Zhonghua ¹ ;

作者机构： 1.Guizhou Univ, Coll Agr, Maize Res Inst, Guiyang 550025, Peoples R China

2.Guizhou Acad Agr Sci, Inst Upland Food Crops, Guiyang 550000, Guizhou, Peoples R China

关键词： maize exotic germplasm; genetic diversity; general combining ability; special combining ability; heterotic pattern

期刊名称：MAYDICA （ 影响因子：0.6； 五年影响因子：0.7 ）

ISSN： 0025-6153

年卷期： 2021 年 66 卷 3 期

页码：

收录情况： SCI

摘要： Introducing exotic maize germplasm can i) enrich the current genetic pool in Southwest China and ii) settle the severe situation of narrowing genetic diversity. To pave the path of the utilization of exotic germplasms from Brazil and India, 33 newly developed lines and six testers were genotyped with 32 simple sequence repeats (SSRs) for classifying heterotic groups. Ten out of those new lines were crossed to six testers according to the North Carolina II mating design, resulting in 60 single-cross hybrids. The 60 hybrids along with the commercial hybrid "Guinongyu889" were evaluated for 12 agronomic traits in two environments. The average polymorphism information content for the 32 SSRs was 0.73 and the average genetic similarity 0.52. The genetic analysis grouped the lines into six heterotic groups that are basically in line with information obtained from pedigree and specific combining ability effects-based groups. The lines 1862 and 363 had high general combining ability, and the hybrids 1862 x 223, Mo17 x 149, and 1862 x 363 exhibited the highest grain yield per plant; therefore, they could be used for the further commercial agronomic test. The high-yielding combinations suggested two promising heterotic patterns "Reid x PB (tem-tropical I)" and "Reid x Tropical", and exotic germplasms from India and Brazil could be utilized directly without bridging into elite germplasms in Southwest China. According to heterotic groups classified in the present study, bridging these exotic materials into elite base breeding populations is recommended for subsequent long-term breeding programs