缓解输血组织交通堵塞:针叶树针叶径向传输网络模型

IF 8.3 1区 生物学 Q1 PLANT SCIENCES
New Phytologist Pub Date : 2024-10-19 DOI:10.1111/nph.20189
Melissa H. Mai, Chen Gao, Peter A. R. Bork, N. Michele Holbrook, Alexander Schulz, Tomas Bohr
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引用次数: 0

摘要

摘要 输糖组织是所有针叶树针的特征,它介导水分和糖分在内皮和轴向血管之间的径向运输。针的线性几何形状所造成的物理限制带来了两个潜在的血管外瓶颈,在这两个瓶颈处,糖和水的对流可能会阻碍糖的输出:一个是在血管接入点,另一个是在内皮层。我们建立了一个输血组织网络模型,以探索其结构和组成如何影响向轴向韧皮部输送糖分。为了以细胞分辨率描述血管外运输,我们通过断层显微镜以及荧光和电子显微镜获得的松针图像构建了网络。输血组织为糖和水提供了不同的物理通道,减少了血管和内皮之间的阻力,减轻了血管侧面的流动收缩。通过输血组织的分枝结构消散流速,可实现内皮层中流入的扩散性糖通量与流出的平流性水通量的双向传输。我们的研究结果阐明了无生理压力条件下输血组织的结构-功能关系。所提出的模型框架也适用于其他裸子植物的不同输导组织形态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Relieving the transfusion tissue traffic jam: a network model of radial transport in conifer needles
Summary Characteristic of all conifer needles, the transfusion tissue mediates the radial transport of water and sugar between the endodermis and axial vasculature. Physical constraints imposed by the needle's linear geometry introduce two potential extravascular bottlenecks where the opposition of sugar and water flows may frustrate sugar export: one at the vascular access point and the other at the endodermis. We developed a network model of the transfusion tissue to explore how its structure and composition affect the delivery of sugars to the axial phloem. To describe extravascular transport with cellular resolution, we construct networks from images of Pinus pinea needles obtained through tomographic microscopy, as well as fluorescence and electron microscopy. The transfusion tissue provides physically distinct pathways for sugar and water, reducing resistance between the vasculature and endodermis and mitigating flow constriction at the vascular flank. Dissipation of flow velocities through the transfusion tissue's branched structure allows for bidirectional transport of an inbound diffusive sugar flux against an outbound advective water flux across the endodermis. Our results clarify the structure–function relationships of the transfusion tissue under conditions free of physiological stress. The presented model framework is also applicable to different transfusion tissue morphologies in other gymnosperms.
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来源期刊
New Phytologist
New Phytologist 生物-植物科学
自引率
5.30%
发文量
728
期刊介绍: New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.
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