了解负压下的外胞体冻结。

IF 8.1 1区生物学 Q1 PLANT SCIENCES

New Phytologist Pub Date : 2025-09-12 DOI:10.1111/nph.70538

Stephen Ingram, Alessandro Zanetti, Linnea Mustonen, Ana A. Piedehierro, Ari Laaksonen, Anna Lintunen

引用次数: 0

摘要

负压对木质部汁液冻结的影响是一个独特的科学问题。平衡热力学表明，由于冰的密度异常，在张力下的液应该在比正压下更高的温度下冻结。然而，在树枝上观察到的情况正好相反：当压力变得更负时，冰点温度会降低。采用冷级阵列测量了不同负压条件下的松枝液样的凝固点，并与相同负压条件下充满液样的凝固点进行了比较。我们发现，提取液的冻结开始比在树枝内低摄氏10度，并且与提取前存在的水势无关。综上所述，这些结果强烈表明，张力下的过冷是一种纯粹的物理现象，木质部组织表面开始成核。通过与气溶胶科学的类比，我们提出导管壁上的孔隙可能形成冰胚或气体纳米泡，两者之间的竞争决定了宏观冰点。基于上述机制的现象学模型在实验不确定性范围内再现了观测到的分支冻结开始温度。

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.