文献类型：期刊文献

英文题名：PagSWEET17a mediates sucrose allocation to xylem during wood formation in poplar

作者：Hao, Xinyi[1] Li, Jifu[1] Zhang, Li[3] Fan, Zhibin[1] Wang, Zheshu[1] Hou, Luxuan[1] Wang, Lijuan[1,2]

第一作者：Hao, Xinyi

通信作者：Wang, LJ[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat Natl Forestry & G, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, CoInnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China;[3]Heze Univ, Coll Agr & Biol Engn, Heze 274015, Shandong, Peoples R China

年份：2024

卷号：222

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20244417287764);Scopus(收录号：2-s2.0-85207357596);WOS:【SCI-EXPANDED(收录号:WOS:001348199800001)】；

基金：This work was supported by National Key Research and Develop-ment Program of China (2021YFD2200201) , the National Natural Sci-ence Foundation of China (31700593) , and Shandong Provincial Natural Science Foundation (ZR2020QC166) .

语种：英文

外文关键词：Poplar; Wood formation; Carbon allocation; Sugar transporter; SWEETs

摘要：Wood is recognized as the primary storage tissue in trees. During the process of wood formation, the xylem actively assimilates carbon from photosynthetic tissues to satisfy its developmental requirements. The photosynthetic product, sucrose, provides precursors and energy for cell wall synthesis, and its transportation significantly impacts the yield and quality of wood. The radial transport is a critical step in the accumulation of photosynthetic products to xylem, yet research on the involved sugar transporters and their roles remains limited. In the present study, PagSWEET17a, a sugar transporter gene with pronounced expression in the xylem, was examined for its expression pattern, substrate specificity, subcellular localization, and the consequential effects on wood formation. The present findings revealed that PagSWEET17a exhibited specificity for sucrose transport, and has triple subcellular localizations, including the plasma membrane, tonoplast, and endoplasmic reticulum membrane. PagSWEET17a expressed in the phloem cells of the stem, as well as in the developing xylem vessels and fiber cells, suggesting its potential involvement in various steps of radial transport. By mediating the accumulation of carbon in the xylem, PagSWEET17a influenced the width of the xylem, as well as the thickness and composition of the secondary cell walls in xylem cells. These insights contribute to a deeper understanding of the molecular mechanisms underlying wood formation and highlight the importance of sugar transporters in this process.