文献类型：期刊文献

英文题名：A Small Guanosine Triphosphate Binding Protein PagRabE1b Promotes Xylem Development in Poplar

作者：Liu, Ying-Li[1] Wang, Li-Juan[1,2] Li, Yu[1,3] Guo, Ying-Hua[1] Cao, Yuan[1] Zhao, Shu-Tang[1,2]

第一作者：Liu, Ying-Li

通信作者：Zhao, ST[1];Zhao, ST[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing, Peoples R China;[3]Chinese Acad Sci, Inst Bot, Key Lab Plant Mol Physiol, Beijing, Peoples R China

年份：2021

卷号：12

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000662945800001)】；

基金：This work was supported by the National Nonprofit Institute Research Grant of CAF (CAFYBB2012039) and the National Key Program on Transgenic Research (2018ZX08020002).

语种：英文

外文关键词：poplar; small gtp binding protein; PagRabE1b; cell wall; wood formation

摘要：Rab GTPases are the subfamily of the small guanosine triphosphate (GTP)-binding proteins which participated in the regulation of various biological processes. Recent studies have found that plant Rabs play some specific functions. However, the functions of Rabs in xylem development in trees remain unclear. In this study, functional identification of PagRabE1b in Populus was performed. Quantitative reverse transcription PCR (qRT-PCR) results showed that PagRabE1b was highly accumulated in stems, especially in phloem and xylem tissues. Overexpression of PagRabE1b in poplar enhanced programmed cell death (PCD) and increased the growth rate and the secondary cell wall (SCW) thickness. Quantitative analysis of monosaccharide content showed that various monosaccharides were significantly increased in secondary xylem tissues of the overexpressed lines. Flow cytometry analysis revealed that the number of apoptotic cells in PagRabE1b-OE lines is more than a wild type (WT), which indicated that PagRabE1b may play an important role in PCD. Further studies showed that overexpression of PagRabE1b increased the expression level of genes involved in SCW biosynthesis, PCD, and autophagy. Collectively, the results suggest that PagRabE1b plays a positive role in promoting the xylem development of poplar.