文献类型：期刊文献

英文题名：PagMYB128 regulates secondary cell wall formation by direct activation of cell wall biosynthetic genes during wood formation in poplar

作者：Hao, Yuanyuan[1] Lu, Fachuang[2,3] Pyo, Seung-Won[4] Kim, Min-Ha[4] Ko, Jae-Heung[4] Yan, Xiaojing[1] Ralph, John[2,3] Li, Quanzi[1]

第一作者：Hao, Yuanyuan

通信作者：Yan, XJ[1];Ko, JH[2]

机构：[1]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[2]Univ Wisconsin Madison, Wisconsin Energy Inst, Dept Biochem, Madison, WI 53726 USA;[3]Univ Wisconsin Madison, Wisconsin Energy Inst, DOE Great Lakes Bioenergy Res Ctr, Madison, WI 53726 USA;[4]Kyung Hee Univ, Dept Plant & Environm New Resources, Yongin 17104, South Korea

年份：2024

卷号：66

期号：8

起止页码：1658-1674

外文期刊名：JOURNAL OF INTEGRATIVE PLANT BIOLOGY

收录：;Scopus(收录号：2-s2.0-85196510068);WOS:【SCI-EXPANDED(收录号:WOS:001252256500001)】；

基金：This work was supported by the National Key Research and Development Program of China (2021YFD2200900 to X.J.). F. L. and J. R. were funded by the DOE Great Lakes Bioenergy Research Center (DOE BER Office of Science DE-SC0018409). We thank Yuan Cao and Dandan Yin (State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing) for their technical assistance for TEM and SEM analyses.

语种：英文

外文关键词：cellulose; hemicellulose; lignin; PagMYB128; Populus; transcription factor; wood formation

摘要：The biosynthesis of cellulose, lignin, and hemicelluloses in plant secondary cell walls (SCWs) is regulated by a hierarchical transcriptional regulatory network. This network features orthologous transcription factors shared between poplar and Arabidopsis, highlighting a foundational similarity in their genetic regulation. However, knowledge on the discrepant behavior of the transcriptional-level molecular regulatory mechanisms between poplar and Arabidopsis remains limited. In this study, we investigated the function of PagMYB128 during wood formation and found it had broader impacts on SCW formation compared to its Arabidopsis ortholog, AtMYB103. Transgenic poplar trees overexpressing PagMYB128 exhibited significantly enhanced xylem development, with fiber cells and vessels displaying thicker walls, and an increase in the levels of cellulose, lignin, and hemicelluloses in the wood. In contrast, plants with dominant repression of PagMYB128 demonstrated the opposite phenotypes. RNA sequencing and reverse transcription - quantitative polymerase chain reaction showed that PagMYB128 could activate SCW biosynthetic gene expression, and chromatin immunoprecipitation along with yeast one-hybrid, and effector-reporter assays showed this regulation was direct. Further analysis revealed that PagSND1 (SECONDARY WALL-ASSOCIATED NAC-DOMAIN PROTEIN1) directly regulates PagMYB128 but not cell wall metabolic genes, highlighting the pivotal role of PagMYB128 in the SND1-driven regulatory network for wood development, thereby creating a feedforward loop in SCW biosynthesis.