Identification and response analysis of xyloglucan endotransglycosylase/hydrolases (XTH) family to fluoride and aluminum treatment in Camellia sinensis

作者：Zichen Wu, Chuanlei Cui, Anqi Xing, Xiaohan Xu, Yi Sun, Zhiqiang Tian, Xuyan Li, Jiangyuan Zhu, Genmei Wang, Yuhua Wang · 发表于：BMC Genomics · 年份：2021 · DOI：10.1186/s12864-021-08056-5 · 被引用次数：26 · 研究领域：Aluminum toxicity and tolerance in plants and animals、Polysaccharides and Plant Cell Walls、Silicon Effects in Agriculture

Abstract Background Xyloglucan endotransglycosylase/hydrolases (XTH) can disrupt and reconnect the xyloglucan chains, modify the cellulose-xyloglucan complex structure in the cell wall to reconstruct the cell wall. Previous studies have reported that XTH plays a key role in the aluminum (Al) tolerance of tea plants ( Camellia sinensis ), which is a typical plant that accumulates Al and fluoride (F), but its role in F resistance has not been reported. Results Here, 14 CsXTH genes were identified from C. sinensis and named as CsXTH1–14 . The phylogenetic analysis revealed that CsXTH members were divided into 3 subclasses, and conserved motif analysis showed that all these members included catalytic active region. Furthermore, the expressions of all CsXTH genes showed tissue-specific and were regulated by Al 3+ and F − treatments. CsXTH1 , CsXTH4 , CsXTH6 – 8 and CsXTH11–14 were up-regulated under Al 3+ treatments; CsXTH1–10 and CsXTH12–14 responded to different concentrations of F − treatments. The content of xyloglucan oligosaccharide determined by immunofluorescence labeling increased to the highest level at low concentrations of Al 3+ or F − treatments (0.4 mM Al 3+ or 8 mg/L F − ), accompanying by the activity of XET (Xyloglucan endotransglucosylase) peaked. Conclusion In conclusion, CsXTH activities were regulated by Al or F via controlling the expressions of CsXTH genes and the content of xyloglucan oligosaccharide in C. sinensis roots was affected by Al or F, which might...