Mistletoes have higher hydraulic safety but lower efficiency in xylem traits than their hosts

IF 8.3 1区生物学 Q1 PLANT SCIENCES

New Phytologist Pub Date : 2024-11-13 DOI:10.1111/nph.20257

Yun-Bing Zhang, Xian-Yan Huang, Marina Corrêa Scalon, Yan Ke, Jing-Xin Liu, Qin Wang, Wen-Hua Li, Da Yang, David S. Ellsworth, Yong-Jiang Zhang, Jiao-Lin Zhang

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引用次数: 0

Abstract

Both mistletoes and their hosts are challenged by increasing drought, highlighting the necessity of understanding their comparative hydraulic properties. The high transpiration of mistletoes requires efficient water transport, while high xylem tensions demand strong embolism resistance, representing a hydraulic paradox.
This study, conducted across four environments with different aridity indices in Yunnan, China, examined the xylem traits of 119 mistletoe–host species pairs.
Mistletoes showed lower water use efficiency, indicating a more aggressive water use. They also showed lower hydraulic efficiency (lower vessel diameter and theoretical hydraulic conductivity) but higher safety (lower vulnerability index and higher conduit wall reinforcement, vessel grouping index, and wood density) compared with their hosts, supporting the trade-off between efficiency and safety. Environmental variation across sites significantly affected xylem trait comparisons between mistletoes and hosts. Additionally, the xylem traits of mistletoes were strongly influenced by host water supply efficiency. The overall xylem trait relationships in mistletoes and hosts were different.
These findings stress the impact of host and site on the hydraulic traits of mistletoes, and suggest that mistletoes may achieve high transpiration by maintaining high stomatal conductance under low water potentials. This study illuminates the distinctive adaptation strategies of mistletoes due to their parasitic lifestyle.

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与寄主相比，槲寄生具有更高的水力安全性，但木质部特征的效率较低

槲寄生及其寄主都面临着日益严重的干旱挑战，因此有必要了解它们的比较水力特性。槲寄生的高蒸腾作用要求高效的水分运输，而木质部的高张力则要求较强的抗栓塞能力，这是一个水力悖论。这项研究在中国云南不同干旱指数的四个环境中进行，考察了119对槲寄生-寄主物种的木质部特征。与寄主相比，槲寄生的水力效率较低（较低的血管直径和理论水力传导率），但安全性较高（较低的脆弱性指数和较高的导管壁加固度、血管分组指数和木材密度），这支持了效率和安全性之间的权衡。不同地点的环境差异极大地影响了槲寄生和寄主木质部性状的比较。此外，槲寄生木质部性状还受到寄主供水效率的强烈影响。这些发现强调了寄主和地点对槲寄生木质部性状的影响，并表明槲寄生可能通过在低水势下保持高气孔导度来实现高蒸腾。这项研究揭示了槲寄生寄生生活方式带来的独特适应策略。

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.