Abstract
Key message
By applying comparative genomics analyses, a high-density genetic linkage map of the Wax 1 ( W1 ) locus was constructed as a framework for map-based cloning.
Abstract
Glaucousness is described as the scattering effect of visible light from wax deposited on the cuticle of plant aerial organs. In wheat, the wax on leaves and stems is mainly controlled by two sets of genes: glaucousness loci (W1 and W2) and non-glaucousness loci (Iw1 and Iw2). Bulked segregant analysis (BSA) and simple sequence repeat (SSR) mapping showed that Wax1 (W1) is located on chromosome arm 2BS between markers Xgwm210 and Xbarc35. By applying comparative genomics analyses, colinearity genomic regions of the W1 locus on wheat 2BS were identified in Brachypodium distachyon chromosome 5, rice chromosome 4 and sorghum chromosome 6, respectively. Four STS markers were developed using the Triticum aestivum cv. Chinese Spring 454 contig sequences and the International Wheat Genome Sequencing Consortium (IWGSC) survey sequences. W1 was mapped into a 0.93 cM genetic interval flanked by markers XWGGC3197 and XWGGC2484, which has synteny with genomic regions of 56.5 kb in Brachypodium, 390 kb in rice and 31.8 kb in sorghum. The fine genetic map can serve as a framework for chromosome landing, physical mapping and map-based cloning of the W1 in wheat.
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Acknowledgments
This work was financially supported by the Ministry of Science and Technology of China (2011AA100104, 2011CB100104), National Science Foundation of China (31030056, 31210103902) and Ministry of Education (MOE) of China (111-02-3).
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The authors have declared that no conflict of interest.
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Communicated by I. D. Godwin.
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Lu, P., Qin, J., Wang, G. et al. Comparative fine mapping of the Wax 1 (W1) locus in hexaploid wheat. Theor Appl Genet 128, 1595–1603 (2015). https://doi.org/10.1007/s00122-015-2534-9
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DOI: https://doi.org/10.1007/s00122-015-2534-9