磁共振成像技术在毛竹幼竹显微结构和水分含量表征中的应用

doi:10.13287/j.1001-9332.202301.040

应用生态学报 ›› 2023, Vol. 34 ›› Issue (1): 83-91.doi: 10.13287/j.1001-9332.202301.040

磁共振成像技术在毛竹幼竹显微结构和水分含量表征中的应用

黄溦溦^1,2, 杨玉莹^1,2,3, 付鹤玲⁴, 丁雨龙^1,2*

¹南京林业大学, 江苏省南方现代林业协同创新中心, 南京 210037;
²南京林业大学竹类研究所, 南京 210037;
³南京林业大学生物与环境学院, 南京 210037;
⁴南京医科大学医药实验动物中心, 南京 210000

收稿日期:2022-08-31 修回日期:2022-11-04 出版日期:2023-01-15 发布日期:2023-06-15
通讯作者: ^*E-mail: ylding@njfu.edu.cn
作者简介:黄溦溦, 女, 1989年生, 博士, 副教授。主要从事森林与气候变化研究。E-mail: wh@njfu.edu.cn
基金资助:
江苏省自然科学基金项目(BK20220413)和国家自然科学基金项目(32271973)资助。

Application of magnetic resonance imaging (MRI) technology in the characterization of microstructure and moisture content of young Moso bamboo

HUANG Wei-wei^1,2, YANG Yu-ying^1,2,3, FU He-ling⁴, DING Yu-long^1,2*

¹Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Nanjing 210037, China;
²Bamboo Research Institute, Nanjing Forestry University, Nanjing 210037, China;
³College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China;
⁴Animal Core Facility, Nanjing Medical University, Nanjing 210000, China

Received:2022-08-31 Revised:2022-11-04 Online:2023-01-15 Published:2023-06-15

摘要/Abstract

摘要： 竹子节部对竹秆的中空结构以及竹秆快速高生长起着关键作用,研究竹子解剖结构有助于认识竹子生长机制。本研究利用核磁共振成像(MRI)无创、高分辨率和准确的技术优势,对毛竹幼竹去笋箨梢部进行横切面高精度核磁共振成像扫描,使用MATLAB软件对 MRI进行灰度值采集,分析节部、近节部和节间水分分布差异。结果表明: 无数维管束在毛竹幼竹节隔以及近节隔内腔反复扭曲和水平转动,组成了一个错综复杂和高度连接的网络结构,通过分轴向载荷来保护重要组织免受机械应力,同时实现水分和营养物质的横向运输,这是毛竹在短时间内快速完成高生长的重要基础。MRI信号值(亮度值)表明,幼竹维管束的水分含量远远高于周围的基本组织。节间平均水分含量和像素点间含水量标准差显著高于节部,近节部居中。MRI技术可以在未来竹子解剖学和生理生化学研究中发挥作用。

关键词: 幼竹节部, 核磁共振成像, 维管束系统, 水分

Abstract: Bamboo nodes play a key role in the hollow structure and the rapid growth of bamboo culm. Studying on the anatomical structure of bamboo is helpful to understand its growth mechanism. Taking the noninvasive, high-resolution and accurate technical advantages of magnetic resonance imaging (MRI), we conducted cross-sectional high-resolution MRI scanning on the tip of young Moso bamboo culm (removed shoot sheath) and extracted the gray value of the MRIs by using MATLAB software to explore the differences of water distribution in nodes, proximal nodes, and internodes. The results showed that numerous vascular bundles were repeatedly twisted and rotated horizontally at the nodal diaphragms and inner wall near the nodal diaphragms of the young bamboo, forming an intricate and highly connected network. The structure protected important tissues from mechanical stress by allocating axial loads, and enabled to laterally transport water and nutrients, which was an important basis for the rapid growth of Moso bamboo in relatively short term. The signal value (also known as brightness value) of MRIs indicated that water content of vascular bundles in young bamboo culm was much higher than that of surrounding parenchyma tissues. The mean value and standard deviation of water content between pixels of internodes were significantly higher than that of nodes, and the values of that in the proximal nodes were intermediate. The development of MRI would play a significant role in the studies of bamboo anatomy, physiology, and biochemistry.

Key words: young bamboo node, magnetic resonance imaging, vascular system, water.

黄溦溦, 杨玉莹, 付鹤玲, 丁雨龙. 磁共振成像技术在毛竹幼竹显微结构和水分含量表征中的应用[J]. 应用生态学报, 2023, 34(1): 83-91.

HUANG Wei-wei, YANG Yu-ying, FU He-ling, DING Yu-long. Application of magnetic resonance imaging (MRI) technology in the characterization of microstructure and moisture content of young Moso bamboo[J]. Chinese Journal of Applied Ecology, 2023, 34(1): 83-91.

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磁共振成像技术在毛竹幼竹显微结构和水分含量表征中的应用

Application of magnetic resonance imaging (MRI) technology in the characterization of microstructure and moisture content of young Moso bamboo

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