The xylem functional traits of eight subtropical tree species is closely related to the intervessel pits ultrastructure

IF 2.1 3区农林科学 Q2 FORESTRY

Trees Pub Date : 2023-11-17 DOI:10.1007/s00468-023-02459-5

Jiabao Liu, Yudie Wang, Ting Wang, Xixi Zhang, Dongsheng Du, Xiancan Zhu, Wen Guo, Ya Zhang

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引用次数: 0

Abstract

Key message

There is a trade-off between plant water transport safety and efficiency, which may be linked to pit ultrastructure traits.

Drought-induced embolism is one of the most important causes of plant death, and there is a close relationship between the formation and spreading of embolism and xylem structure. However, many previous studies on xylem structure lack detailed observation in intervessel pits, especially pit membranes, which have important roles in water transport and embolism spreading for angiosperms. Here, we selected eight species from subtropical forests and studied their xylem structure and functional traits. The results showed that there was a trade-off between hydraulic transport safety and efficiency in eight species, which may be related to their xylem structure. The diameter of pit aperture and pit membrane, as well as the pit membrane thickness, showed significant relationships with xylem embolism resistance, indicating that the ultrastructure of intervessel pits was a good predictor for xylem safety. With detailed observation in pits ultrastructure, this study helps to elucidate the response mechanism of trees to drought and predict forest distribution and succession.

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8种亚热带树种木质部的功能性状与管间坑的超微结构密切相关

植物水运的安全性和效率之间存在权衡，这可能与坑的超微结构特征有关。干旱引起的栓子是植物死亡的重要原因之一，栓子的形成和扩散与木质部结构密切相关。然而，以往对木质部结构的研究大多缺乏对管间坑，特别是管间坑膜的详细观察，而管间坑膜在被子植物的水分输送和栓塞扩散中起着重要作用。本文选取了8种亚热带森林树种，对其木质部结构和功能性状进行了研究。结果表明，8种植物在水力输送的安全性和效率之间存在权衡关系，这可能与木质部结构有关。果核孔直径、果核膜直径和果核膜厚度与木质部抗栓塞性有显著关系，表明果核孔的超微结构是木质部安全性的良好预测指标。通过对坑穴超微结构的详细观察，有助于阐明树木对干旱的响应机制，预测森林的分布和演替。

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

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.