期刊
PLANT PHYSIOLOGY
卷 180, 期 3, 页码 1310-1321出版社
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.19.00344
关键词
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资金
- Ministerio de Economia y Competitividad (Ministry of Economy and Competitiveness) [CTQ2014-60764-JIN, AGL2017-83036-R]
- Ministry of Economy and Competitiveness | Consejo Superior de Investigaciones Cientificas (Spanish National Research Council) project [2017-40E-071]
- U.S. Department of Energy (DOE) [DE-SC0018409]
- Fundacao para a Ciencia e a Tecnologia (Foundation for Science and Technology) [UID/AGR/00239/2013]
- SUSFOR doctoral program [PD/BD/52697/2014]
- Fundação para a Ciência e a Tecnologia [UID/AGR/00239/2013] Funding Source: FCT
Recent investigations have revealed that, in addition to monolignols, some phenolic compounds derived from the flavonoid and hydroxystilbene biosynthetic pathways can also function as true lignin monomers in some plants. In this study, we found that the hydroxystilbene glucosides isorhapontin (isorhapontigenin-O-glucoside) and, at lower levels, astringin (piceatannol-O-glucoside) and piceid (resveratrol-O-glucoside) are incorporated into the lignin polymer in Norway spruce (Picea abies) bark. The corresponding aglycones isorhapontigenin, piceatannol, and resveratrol, along with glucose, were released by derivatization followed by reductive cleavage, a chemical degradative method that cleaves beta-ether bonds in lignin, indicating that the hydroxystilbene glucosides are (partially) incorporated into the lignin structure through beta-ether bonds. Two-dimensional NMR analysis confirmed the occurrence of hydroxystilbene glucosides in this lignin, and provided additional information regarding their modes of incorporation into the polymer. The hydroxystilbene glucosides, particularly isorhapontin and astringin, can therefore be considered genuine lignin monomers that participate in coupling and cross-coupling reactions during lignification in Norway spruce bark.
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