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- Title
Fine mapping TaFLW1, a major QTL controlling flag leaf width in bread wheat ( Triticum aestivum L.).
- Authors
Xue, Shulin; Xu, Feng; Li, Guoqiang; Zhou, Yan; Lin, Musen; Gao, Zhongxia; Su, Xiuhong; Xu, Xiaowu; Jiang, Ge; Zhang, Shuang; Jia, Haiyan; Kong, Zhongxin; Zhang, Lixia; Ma, Zhengqiang
- Abstract
Introduction: Flag leaf width (FLW) is directly related to photosynthetic capacity and yield potential in wheat. In a previous study, Qflw.nau- 5A controlling FLW was detected on chromosome 5A in the interval possessing Fhb5 for type I Fusarium head blight (FHB) resistance using a recombinant inbred line population derived from Nanda2419 × Wangshuibai. Materials and methods: Qflw.nau- 5A near-isogenic line (NIL) with the background of Mianyang 99-323 and PH691 was developed and evaluated. FLW inheritance was investigated using two F populations developed from crossing the Qflw.nau- 5A NILs with their recurrent parents. One hundred ten and 28 recombinants, which included 10 and 5 types of recombinants, were identified from 2816 F plants with Mianyang 99-323 background and 1277 F plants with PH691 background, respectively, and phenotyped in field trials for FLW and type I FHB resistance. Deletion bin mapping was applied to physically map Qflw.nau- 5A. Results and conclusions: The introduction of Wangshuibai Qflw.nau- 5A allele reduced the FLW up to 3 mm. In the F populations, Qflw.nau- 5A was inherited like a semi-dominant gene, and was therefore designated as TaFLW1. The FLW of the recombinant lines displayed a distinct two-peak distribution. Recombinants with wider leaves commonly have Mianyang 99-323 or PH691 chromatin in the 0.2 cM Xwmc492- Xwmc752 interval that resided in the 5AL12-0.35-0.57 deletion bin, and recombinants with narrow leaves were Wangshuibai genotype in this interval. Phenotypic recombination between FLW and type I FHB resistance was identified, implying TaFLW1 was in close linkage with Fhb5. These results should aid wheat breeders to break the linkage drag through marker-assisted selection and assist in the map-based cloning of TaFLW1.
- Subjects
VEGETATION mapping; WHEAT; LEAVES; PHOTOSYNTHESIS; WHEAT yields; PLANT chromosomes; PLANT clones
- Publication
Theoretical & Applied Genetics, 2013, Vol 126, Issue 8, p1941
- ISSN
0040-5752
- Publication type
Article
- DOI
10.1007/s00122-013-2108-7