H218O vapour labelling reveals evidence of radial Péclet effects, but in not all leaves

IF 8.3 1区生物学 Q1 PLANT SCIENCES

New Phytologist Pub Date : 2024-09-05 DOI:10.1111/nph.20087

Margaret M. Barbour, Melissa A. White, Lulu Liu

引用次数: 0

Abstract

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H2 18O 蒸汽标记显示了径向贝克莱特效应，但并非所有叶片都有这种效应。

关于叶片水同位素贝氏梯度的相关性，存在着相互矛盾的证据，因此很难准确预测同位素组成的变化。在这里，我们使用 H2 18O 蒸汽标记法直接测试叶片水同位素是否会向木质部后向扩散，从而被带到更远的叶片部分。由于观察到一些叶片的叶尖和外缘富集程度越来越高，因此我们假定叶片的水同位素会向后扩散。一些叶片（而非所有叶片）的大量叶水显示出径向贝克莱特效应，而叶片的水力设计可能会影响叶片中同位素梯度的发展，这使叶水同位素模型的选择变得更加复杂。在所评估的两个单子叶植物物种（燕麦和玉米）中检测到了 H2 18O 蒸汽标签的前传，但在两个双子叶植物物种（凤仙花和向日葵）中没有检测到。此外，不同蒸腾速率下的叶片体积水测量结果表明，只有狐尾草的叶片体积水具有贝克莱效应。我们的结论是，叶片水力设计和水在运输途径中的相对速度都会影响叶片水的同位素组成，从而调和了以前关于贝克莱特效应与叶片水同位素相关性的看似矛盾的结果。

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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来源期刊

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.