2026-10-15T01:36:25Z https://www.scidb.cn/oai

10.57760/sciencedb.0118j 2026-09-03T11:10:35Z

2026-09-03 Transcriptomic and Metabolic Insights into the Regulation of Lignin and Cellulose Biosynthesis by Exogenous Potassium in Soybean Stems doi:10.57760/sciencedb.0118j en The mechanical strength of soybean stems is critical for lodging resistance and stable crop yield, and it is largely governed by the coordinated deposition of cellulose and lignin within plant cell walls. In this study, the soybean cultivar "Heinong 40" was evaluated under two potassium (K) regimes: low potassium (K4) and sufficient potassium (K28). Through anatomical profiling, physiological characterization, and integrated transcriptomic and metabolomic analyses, we elucidated the phenotypic and molecular mechanisms by which exogenous potassium regulates the mechanical development of the fourth (D-4) internode. The results demonstrated that K28 treatment significantly thickened the D-4 internode, enhanced K accumulation, enlarged vascular bundle areas, and thickened the secondary cell walls of mechanical tissues, accompanied by 33.19% and 52.05% increases in cellulose and lignin contents, respectively. Multi-omics integration further revealed that sufficient K supply stimulated sucrose catabolism and glycolytic flux, thereby supplying carbon precursors and energy for cellulose biosynthesis. Concurrently, the transcriptional upregulation of key structural genes channeled carbon flux into the phenylpropanoid pathway, driving lignin monomer biosynthesis. Overall, these findings demonstrate that an adequate K supply reinforces soybean stem mechanical strength by optimizing anatomical architecture and promoting the synergistic assembly of the cell wall "cellulose skeleton–lignin matrix." Exogenous potassium; Soybean stem; Lignin; Cellulose; Stem anatomy; Multi-omics. 徐楚 东北农业大学 颜双双 RESTRICTED dataset Science Data Bank