薄弱环节还是坚实基础?细根网络和茎易受木质部栓塞的影响

IF 8.3 1区 生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2024-09-12 DOI:10.1111/nph.20115
Beatrice L. Harrison Day, Craig R. Brodersen, Timothy J. Brodribb
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引用次数: 0

摘要

摘要 解决根系在整个植物抗旱木质部栓塞体系中的位置问题,对于预测物种何时脱离土壤水资源至关重要。已发表的研究普遍认为,根系是植物维管系统中最脆弱的器官,但估计值差异很大。然而,我们对根系栓塞的了解并不包括细根(直径 2 毫米),它们构成了根系网络吸收水分和养分的总表面积的大部分。我们采用标准化的原位方法(光学方法和显微CT)测量了来自主要陆生植物支系的10种维管植物(5种被子植物、3种针叶树、1种蕨类植物和1种狼尾草)的细根和茎木质部的脆弱性。在所有研究物种中,整个网络的平均细根栓塞阻力与茎相匹配或超过茎。其中 6 个物种(1 个蕨类植物、1 个狼尾草属植物、3 个针叶树和 1 个被子植物)的细根抗栓塞能力明显高于茎。根木质部导管直径与易栓塞性之间没有明显的关系。这些结果有助于深入了解植物在吸收水分和养分部位的水力通路阻力,并对长期以来认为细根比茎更易受栓塞影响的假设提出了质疑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Weak link or strong foundation? Vulnerability of fine root networks and stems to xylem embolism

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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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