Abstract: 【Objective】QTL mapping for plant height and ear height were conducted with phenotype data collected from multi-environments, in order to identify stable QTL for plant height and ear height, which will provide a theoretical basis for molecular breeding of ideal plant type in maize.【Method】A total of 150 F7 recombinant inbred lines (RILs) population as the experimental materials were derived from the dominant maize inbred lines Xu178 and K12. Firstly, selecting 495 SSR markers from the MaizeGDB to detect polymorphism in parents, using markers with polymorphism to analyze population genotype. MapMaker V3.0 was used to part the linkage groups and to construct the linkage map. Secondly, QTL mapping for plant height and ear height were detected with inclusive composite interval mapping (ICIM) method of QTL IciMapping V4.0. Using phenotype data which were collected in two years and from three locations (Yulin, Shaanxi. Yangling, Shaanxi. Huludao, Liaoning. 2014-2015) and estimated the breeding value. Finally, conditional QTL analysis was conducted and compared with unconditional QTL analysis to discuss the genetic relationship between plant height and ear height at the QTL level.【Result】The genetic map was constructed with 191 filtered SSR markers, and the total length was 2 069.1 cM with the average length 10.8 cM. For plant height and ear height from 6 environments and estimated breeding value, ten plant height QTL and eight ear height QTL were detected, which distributed on the chromosomes 1, 3, 4, 5, 6, 7, 8 and 10, respectively, the LOD values ranged from 3.25 to 8.36, the additive effect from -6.41 to 8.70, and the range of individually explaining phenotypic variation was from 6.96% to 27.41%. Above of all QTL, six major QTL with LOD more than 10.00% could be detected in 3 or more environments. Of which, two QTL were detected on the same region of Bin5.01/5.02 in 6 environments, the LOD values ranged from 3.25 to 6.48, the additive effect from 4.05 to 8.70. Two QTL were detected on the same region of Bin3.03/3.04 in 5 environments, the LOD values ranged from 4.71 to 8.36, the additive effect ranged from 4.93 to 6.36. As well as two QTL were detected on the same interval of Bin6.02 in 3 environments, the LOD values ranged from 3.52 to 5.21, the additive effect ranged from 4.38 to 8.16, respectively. The favorite alleles of these QTL were all coming from female parent Xu178. Conditional analysis and unconditional analysis showed that the six QTL of three chromosomal regions were three pleiotropism loci which controlled plant height and ear height.【Conclusion】The inheritance of plant height and ear height of maize is strongly influenced by the environments, most of the QTL can be detected only in 1 or 2 environments. Three major QTL can be detected in 3 or more environments, and they are able to stable heredity with high phenotypic variation, it is expected that the major QTL could be applied in the molecular breeding.

Key words: maize, inclusive composite interval mapping, plant height, ear height, QTL