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Zhang, Jun-Feng; Xu, Yong-Qing; Dong, Jia-Min; Peng, Li-Na; Feng, Xu; Wang, Xu; Li, Fei; Miao, Yu; Yao, Shu-Kuan; Zhao, Qiao-Qin; Feng, Shan-Shan; Hu, Bao-Zhong; Li, Feng-Lan
PloS one, 03/2018, Volume: 13, Issue: 3Journal Article
Plant expansins are proteins involved in cell wall loosening, plant growth, and development, as well as in response to plant diseases and other stresses. In this study, we identified 128 expansin coding sequences from the wheat (Triticum aestivum) genome. These sequences belong to 45 homoeologous copies of TaEXPs, including 26 TaEXPAs, 15 TaEXPBs and four TaEXLAs. No TaEXLB was identified. Gene expression and sub-expression profiles revealed that most of the TaEXPs were expressed either only in root tissues or in multiple organs. Real-time qPCR analysis showed that many TaEXPs were differentially expressed in four different tissues of the two wheat cultivars-the cold-sensitive 'Chinese Spring (CS)' and the cold-tolerant 'Dongnongdongmai 1 (D1)' cultivars. Our results suggest that the differential expression of TaEXPs could be related to low-temperature tolerance or sensitivity of different wheat cultivars. Our study expands our knowledge on wheat expansins and sheds new light on the functions of expansins in plant development and stress response.
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