玉米穗上节间长度是影响冠层结构的主要因素，分析其遗传特点对于改善玉米植株群体结构、提高光合效率具有重要意义。以豫82×沈137的229个F₂单株为作图群体，构建了具有212个位点的SSR标记连锁图谱，图谱总长度为1943.8cM，平均间距8.76 cM，通过229个F_2∶3家系穗上节间距的鉴定和QTL定位分析，共检测出与节间距有关的14个QTL，分布在第1、2、3、4、7、9染色体上，未检测到控制穗上5个节间距的共同QTL。穗上第3节间距的qThiIL3、第4节间距的qForIL3和第5节间距的qFifIL3标记区间相同，贡献率在8.89%～16.36%，可能为控制节间距的一个主效QTL。

The internodes length above upmost ear is the one of the main factors impacting the canopy structure of maize, analyzing the genetic characteristics is the great significance to improve the structure of groups and the photosynthetic efficiency. In this study, a genetic linkage map containing 212 simple sequence repeat(SSR) markers was constructed based on a mapping population consisting of 229 F₂ individuals from the cross between inbred lines Yu82 and Shen137. This SSR linkage map spans a total of 1 943.8 cM with an average interval of 8.76 cM. Quantitative trait loci(QTL) for internodes length above upmost ear were identified in 229 F_2∶3 families. Fourteen QTLs for internodes length were detected which distribute on 1, 2, 3, 4, 7 and 9 chromosomes, but common QTL were not detected. qThiIL3, qForIL3, qFifIL3 respectively from the third, the forth and the fifth internodes length above upmost ear may be a major QTL which control internodes length. There is a common marker interval to qThiIL3, qForIL3 and qFifIL3. Single QTL contribution to phenotypic variation ranged from 8.89% to 16.36%.

国家“863”计划(2006AA001003)、河南省重大科技专项(06200110200)