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利用与穗行数有关的5个导入系及轮回亲本综3进行GriffingⅣ双列杂交发展分离群体,结合SSR标记和田间表型鉴定,分析玉米穗行数QTL及其相互作用。在导入系×综3所发展的5个F2群体中,仅在一个群体中检测到1个穗行数QTL,所解释的表型变异为10.68%。在导入系间杂交所发展的F2群体中检测到9个QTLs,分别位于第13、、8染色体上,所解释的表型变异在4.53%～6.52%之间。另外,检测到2对QTL间互作,10对QTL与未检测到QTL的导入片段间的互作,单个F2群体中各类互作所解释的表型变异显著大于QTL所解释的表型变异。这些结果表明,基因互作在玉米穗行数形成中起着重要的作用。
The five populations and the recurrent parents were used to develop the segregation population with Griffing Ⅳ. The QTLs for QTLs and their interactions were analyzed by SSR markers and field phenotypes. Among 5 F2 populations developed from the introduction × 3, only one QTL per spike was detected in one population, explaining a phenotypic variation of 10.68%. Nine QTLs were detected in the F2 population derived from interspecific hybridization, which were located on chromosomes 13 and 8, respectively. The explained phenotypic variation ranged from 4.53% to 6.52%. In addition, the interaction between two pairs of QTLs was detected, and the interaction between 10 QTLs and the non-QTLs was detected. The phenotypic variation explained by each type of interaction in a single F2 population was significantly larger than that explained by QTL . These results indicate that gene interaction plays an important role in the formation of ear rows.