Shandong Agricultural University State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Taian Subcenter of National Wheat Improvement Center, College of Agronomy Taian 271018 China
Municipal Academy of Agricultural Sciences Jining 272031 Shandong, China
Chinese Academy of Sciences Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology Shijiazhuang 050021 Hebei, China
Chinese Academy of Agricultural Sciences Tobacco Research Institute Qingdao 266101 China
Ltd. Handian Industrial Zone Tianxing Biotechnology Co. 256200 Zouping Shandong, China
A recombinant inbred line (RIL) population with 302 lines derived from a cross of Weimai 8 × Luohan 2 was used to identify the quantitative trait loci (QTL) for plant height (PH) in wheat (Triticum aestivum L.). Possible genetic relationships between PH and PH components (PHC), including spike length (SL) and internode length from the first to the fourth node counted from the top, abbreviated as FIITL, SITL, TITL and FOITL, respectively, were evaluated at the QTL level. A QTL for PH was mapped using data on PH and on PH conditioned by PHC using the IciMapping V3.0 software. Conditional QTL mapping proved that, at the QTL level, SL contributed the least to PH, followed by FIITL and FOITL, while TITL had the strongest influence on PH, followed by SITL. These results indicate that the conditional QTL mapping method can be used to evaluate possible genetic relationships between PH and PHC, and that it can efficiently and precisely reveal counteracting QTL, which will enhance our understanding of the genetic basis of PH in wheat.