文献类型：期刊文献

英文题名：Spatial organization and connectivity of wood rays in Pinus massoniana xylem based on high-resolution mu CT-assisted network analysis

作者：Ma, Lingyu[1] Meng, Qiulu[1] Jiang, Xiaomei[1] Ge, Zhedong[2] Cao, Zixiong[3] Wei, Yupei[1] Jiao, Lichao[1] Yin, Yafang[1] Guo, Juan[1]

第一作者：马灵玉

通信作者：Guo, J[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dongxiaofu 1, Beijing 100091, Peoples R China;[2]Shandong Jianzhu Univ, Sch Informat & Elect Engn, 1000 Fengming Rd, Jinan 250101, Shandong, Peoples R China;[3]Object Res Syst ORS Inc, 460 Ste Catherine West,600, Montreal, PQ H3B 1A7, Canada

年份：2023

卷号：258

期号：2

外文期刊名：PLANTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001020602300001)】；

基金：We gratefully acknowledge Mr. Yonggang Zhang from the Research Institute of Wood Industry, Chinese Academy of Forestry, for help in the sample collection. This work was supported by the National Natural Science Foundation of China (31890772), National Natural Science Foundation of China (32071691), the department of Science and Technology, National Forestry and Grassland Administration (2020132601) and Fundamental Research Funds for the Central Non-proft Research Institution of CAF (CAFYBB2021QC003).

语种：英文

外文关键词：X-ray mu CT; Tissue percentage; Wood rays; Bordered pits; Cross-field pits; Axial resin canal

摘要：Spatial organization and connectivity of wood rays are essential for understanding the wood hierarchical architecture, but the spatial information is ambiguous due to small cell size. Herein, 3D visualization of rays in Pinus massoniana was performed using high-resolution mu CT. We found brick-shaped rays were 6.5% in volume fractions, nearly twice the area fractions estimated by 2D levels. Uniseriate rays became taller and wider during the transition from earlywood to latewood, which was mainly contributed from the height increment of ray tracheids and widened ray parenchyma cells. Furthermore, both volume and surface area of ray parenchyma cells were larger than ray tracheids, so ray parenchyma took a higher proportion in rays. Moreover, three different types of pits for connectivity were segmented and revealed. Pits in both axial tracheids and ray tracheids were bordered, but the pit volume and pit aperture of earlywood axial tracheids were almost tenfold and over fourfold larger than ray tracheids. Contrarily, cross-field pits between ray parenchyma and axial tracheids were window-like with the principal axis of 31.0 mu m, but its pit volume was approximately one-third of axial tracheids. Additionally, spatial organization of rays and axial resin canal was analyzed by a curved surface reformation tool, providing the first evidence of rays close to epithelial cells inward through the resin canal. Epithelial cells had various morphologies and large variations in cell size. Our results give new insights into the organization of radial system of xylem, especially the connectivity of rays with adjacent cells.