Abstract
Photosynthesis of carbohydrates is the primary source of grain yield in wheat. Photosynthetic organs, especially flag leaves and awns play important roles in wheat growth and development. Genetic analysis of flag leaf posture, size and shape and presence/absence of awns was conducted using a set of 269 recombinant inbred lines (RILs) derived from Yanda1817 × Beinong6. Six agronomic traits comprising flag leaf angle (FLAN), flag leaf width (FLW), flag leaf length (FLL), the ratio of length/width of flag leaf (FLR), flag leaf area (FLA) and presence/absence of awns were evaluated in Shijiazhuang (2011, 2012 and 2013) and Beijing (2012). Using the available high-density single nucleotide polymorphism and simple sequence repeats (SSR) genetic linkage map, a total of 61 putative quantitative trait loci (QTL) for FLAN, FLW, FLL, FLR and FLA were detected on 16 of the 21 wheat chromosomes excluding 1D, 4B, 5D, 6A and 7A, with single QTL in different environments explaining 2.49–42.41 % of the phenotypic variation. Among the identified QTL, 17 were for FLAN, 11 for FLW, seven for FLL, 13 for FLR and 13 for FLA. Twenty-five (41 %) QTL were detected in at least two environments, while four QTL for FLW were detected in all environments. Thirty QTL were associated with higher number of flag leaf traits originated from Yanda1817 alleles, whereas the remaining 31 QTL were derived from Beinong6. In addition, pleiotropic effects were detected for QTL on chromosomes 2D, 3B, 4A, 4D, 5A, 5B, 6B, 6D and 7D that could serve as target regions for fine mapping and marker-assisted selection in wheat breeding programs. Genetic analysis revealed that the presence/absence of awns in the RIL population is controlled by the awn-inhibitor gene B1 linked to SSR marker Xgwm291 on the long arm of chromosome 5A. Our results also suggest that physiological traits FLL, FLW and FLA were significantly and positively correlated to spike length (SL), grain weight per spike and grain number per spike. FLR was significantly and positively related to SL but negatively related to grain width and grain thickness (GT). In addition, the awn trait was strongly and positively correlated to thousand grain weight, grain length and GT.
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Acknowledgments
The authors are grateful to Prof. Andrew O. Jackson of the University of California at Berkeley for editing the manuscript. This work was financially supported by the 973 project (2011CB100104), National Natural Science Foundation of China (31271710, 31301312) and Ministry of Education (MOE) of China (111-02-3).
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The authors have declared no conflict of interest. Although co-author Chengguo Yuan is currently employed by Gaoyi Stock Seed Farm, China, all of his contributions to the current manuscript were completed while he was a graduate student at China Agricultural University (CAU). Thus, the author does not have any conflict of interest to report here. This does not alter our adherence to Euphytica policies on sharing data and materials.
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Qiuhong Wu and Yongxing Chen have contributed equally to this work.
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10681_2015_1603_MOESM1_ESM.xlsx
Supplementary material 1 (XLSX 72 kb) Phenotypic data in different environments for flag leaf traits in the Yanda1817 × Beinong6 RIL population
10681_2015_1603_MOESM2_ESM.xlsx
Supplementary material 2 (XLSX 378 kb) QTL for FLAN, FLW, FLL, FLR and FLA detected in all the environments in the Yanda1817 × Beinong6 RIL population
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Wu, Q., Chen, Y., Fu, L. et al. QTL mapping of flag leaf traits in common wheat using an integrated high-density SSR and SNP genetic linkage map. Euphytica 208, 337–351 (2016). https://doi.org/10.1007/s10681-015-1603-0
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DOI: https://doi.org/10.1007/s10681-015-1603-0