1. Quantitative trait locus mapping for seed dormancy in different post-ripening stages in a Tibetan semi-wild wheat ( Triticum aestivum ssp . tibetanum Shao).
- Author
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Jiang, Yun-Feng, Wang, Ji-Rui, Luo, Wei, Wei, Yu-Ming, Qi, Peng-Fei, Liu, Ya-Xi, Jiang, Qian-Tao, Peng, Yuan-Ying, Chen, Guo-Yue, Dai, Shou-Fen, Zheng, You-Liang, and Lan, Xiu-Jin
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WHEAT , *SEED dormancy , *LOCUS in plant genetics , *RIPENING of crops , *PREHARVEST sprouting of corn , *WHEAT breeding - Abstract
Tibetan semi-wild wheat ( Triticum aestivum ssp. tibetanum Shao) is a hexaploid wheat resource distributed only in Tibet that has an interesting type of seed dormancy in addition to hulled glumes and brittle spikelets. A whole-genome linkage map of T. aestivum ssp. tibetanum was constructed for a population of 186 recombinant inbred lines using 645 diversity array technology (DArT) markers, 127 simple sequence repeat markers and three R- 1 genotyping markers. Seed dormancy was evaluated at five post-ripening stages from 2010 to 2013. Comprehensive quantitative trait locus (QTL) mapping by inclusive composite interval mapping analysis identified seven QTLs for seed dormancy, designated as Qsd.sau- 1B, Qsd.sau- 3A, Qsd.sau- 3B, Qsd.sau- 3D, Qsd.sau- 4A1, Qsd.sau- 4A2, and Qsd.sau- 7A, on chromosomes 1BL, 3AL, 3BL, 3DL, 4AS, 4AL, and 7AL, which explained 8.9, 7.2, 10.8, 7.0, 11.4, 9.4, and 12.7 % of phenotypic variation, respectively. Qsd.sau- 4A1 and Qsd.sau- 7A have only rarely been reported in domesticated common wheat but were prominent in T. aestivum ssp. tibetanum accession Q1028. Qsd.sau- 4A1 was associated with intense, short-duration dormancy and was recognized as an ideal QTL for wheat breeding. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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