文献类型：期刊文献

英文题名：Variation of Chemical Components in Sapwood, Transition Zone, and Heartwood of Dalbergia odorifera and Its Relationship with Heartwood Formation

作者：Ma, Ruoke[1] Liu, Heng[1,2] Fu, Yunlin[1] Li, Yingjian[1] Wei, Penglian[1] Liu, Zhigao[1]

第一作者：Ma, Ruoke

通信作者：Fu, YL[1]

机构：[1]Guangxi Univ, Coll Forestry, Nanning 540004, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China

年份：2021

卷号：12

期号：5

外文期刊名：FORESTS

收录：;EI(收录号：20212110409987);Scopus(收录号：2-s2.0-85106166761);WOS:【SCI-EXPANDED(收录号:WOS:000653935800001)】；

基金：Supplementary Materials: The following are available online at www.mdpi.com/xxx/s1, Figure S1: The color change of extracted lignin, Table S1: Intra-and inter-day repeatability of five compounds, Table S2: Recoveries of five compounds, Table S3: Stability of five compounds, Table S4: Change of lignin extraction rate, Table S5: Element content of different growth ring in Dalbergia Odorifera. Author Contributions: Y.F., H.L. and R.M. conceived and designed the experiments, R.M. wrote the paper, H.L. and R.M. performed the experiments and analyzed the data. Y.L., P.W. and Z.L. participated in and help to complete the experiments. All authors have read and agreed to the published version of the manuscript. Funding: This research was supported by the National Natural Science Foundation of China (31870540). (31870540).

语种：英文

外文关键词：Dalbergia odorifera; sapwood; transition zone; heartwood; secondary metabolites; lignin; mineral elements

摘要：Heartwood has a high economic value because of its natural durability, beautiful color, special aroma, and richness in active ingredients used in traditional Chinese medicine. However, the mechanism of heartwood formation remains unclear. Dalbergia odorifera was selected as the object of research to analyze this variation in the chemical composition of sapwood, transition zone, and heartwood as well as to elucidate the relationship between this variation and the formation of heartwood. The variation of secondary metabolites was analyzed using gas chromatography-mass spectrometry and ultra-high performance liquid chromatography-mass spectrometry, the variation of lignin was analyzed using Fourier transform infrared spectroscopy and ultraviolet visible spectrophotometry, and the variation law of mineral elements was analyzed using atomic absorption spectrophotometry. The results demonstrated that contents of characteristic secondary metabolites in Dalbergia odorifera were mainly distributed in heartwood (84.3-96.8%), increased from the outer to inner layers of the xylem, and sudden changes occurred in the transition zone (the fourth growth ring). The Dalbergia odorifera lignin can be identified as typical "syringyl-guaiacyl (S-G)" lignin, and the color darkened from the outside to the inside. The results demonstrated that there were more benzene rings and conjugated C=O structures in the heartwood. Additionally, the variation of minerals in the xylem was related to elemental types; the average concentrations of Mg, Ca, Fe and Sr were higher in the heartwood than in the sapwood, whereas the concentrations of K and Zn were higher in the sapwood than in the heartwood owing to the reabsorption of elements. The concentrations of Na and Cu were similar in the heartwood and sapwood. The composition and structural characteristics of secondary metabolites, lignin, and mineral elements in the three typical xylem regions (sapwood, transition zone and heartwood) of Dalbergia odorifera changed. The most abrupt change occurred in the narrow xylem transition zone, which is the key location involved in heartwood formation in Dalbergia odorifera.