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Mengzhen Hao,Yuhang Zhou,Jinhui Zhou,Min Zhang,Kangjiao Yan,Sheng Jiang,Wenshui Wang,Xiaoping Peng,San Zhou 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.5
Background: Ginsenosides accumulation responses to temperature are critical to quality formation in cold-dependent American ginseng. However, the studies on cold requirement mechanism relevant to ginsenosides have been limited in this species. Methods: Two experiments were carried out: one was a multivariate linear regression analysis between the ginsenosides accumulation and the environmental conditions of American ginseng from different sites of China and the other was a synchronous determination of ginsenosides accumulation, overall DNA methylation, and relative gene expression in different tissues during different developmental stages of American ginseng after experiencing different cold exposure duration treatments. Results: Results showed that the variation of the contents as well as the yields of total and individual ginsenosides Rg1, Re, and Rb1 in the roots were closely associated with environmental temperature conditions which implied that the cold environment plays a decisive role in the ginsenoside accumulation of American ginseng. Further results showed that there is a cyclically reversible dynamism between methylation and demethylation of DNA in the perennial American ginseng in response to temperature seasonality. And sufficient cold exposure duration in winter caused sufficient DNA demethylation in tender leaves in early spring and then accompanied the high expression of flowering gene PqFT in flowering stages and ginsenosides biosynthesis gene PqDDS in green berry stages successively, and finally, maximum ginsenosides accumulation occurred in the roots of American ginseng. Conclusion: We, therefore, hypothesized that cold-induced DNA methylation changes might regulate relative gene expression involving both plant development and plant secondary metabolites in such cold-dependent perennial plant species.
Binpeng Zhang,Dongjie Yang,Xueqing Qiu,Yong Qian,Mengzhen Yan,Qiong Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
In this work, lignin-derived porous carbon was prepared using alkali lignin (AL) or lignosulfonic acid (LS)as a precursor to reveal the activation effects of potassium compound (KHCO3, K2CO3 and KOH) ontechnical lignin with different degree of aggregation. Quartz crystal microbalance with dissipation andatomic force microscope testing results showed that KHCO3 had the best activation effect on AL having ahighly aggregated and dense microstructure, thanks to the expansion effect from KHCO3. LS has a highlydispersed and loose microstructure, and KOH had the best activation effect on LS. This is because thestabilizing effect from KOH could avoid excessive destruction of pore structure during carbonization andactivation process. Therefore, the specific surface area of AL-derived porous carbon obtained with KHCO3and LS-derived porous carbon obtained with KOH could reach 2084 and 2770 m2 g 1, while theabsorption capacity could reach 701 and 870 mg g 1 for sulfamethazine respectively. Our result providesa theoretical base for preparing high quality lignin-derived porous carbon adsorbent with different kindsof technical lignin