在不同树龄和气候条件下,Fagus sylvatica L.从顶端到基部的导管加宽保持一致。

IF 3.5 2区 农林科学 Q1 FORESTRY
Angelo Rita, Osvaldo Pericolo, Jan Tumajer, Francesco Ripullone, Tiziana Gentilesca, Antonio Saracino, Marco Borghetti
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引用次数: 0

摘要

木质部具有水分运输、机械支撑和储存等重要功能。这些功能由不同的细胞承担,不仅在物种内部,而且在单棵树木内部都表现出显著的解剖学差异。在这项研究中,我们使用了一个综合数据集来研究预测的水力血管直径加宽值与树顶距离的一致性,该值由 Dh ∝ L β 关系表示(其中 Dh 为水力血管直径,L 为与茎顶的距离,β 为缩放指数)。我们的分析涉及在意大利亚平宁山脉两个不同地点采样的十棵法桐。我们的结果有力地强调了血管直径与茎顶距离之间的可预测模式,β ~ 0.20 在不同的韧皮部年龄和气候条件下保持一致。这一发现支持了这样一个假设,即树木在生长过程中不会改变其轴向配置,即通过缩放血管直径来补偿树高带来的水力限制。研究进一步表明,树木内部的变异极大地影响了血管直径-茎长指数的整体变异。了解导致加宽指数个体内变异的因素至关重要,尤其是在与种间反应和对干旱胁迫的适应有关的方面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tip-to-base conduit widening remains consistent across cambial age and climates in Fagus sylvatica L.

Water transport, mechanical support and storage are the vital functions provided by the xylem. These functions are carried out by different cells, exhibiting significant anatomical variation not only within species but also within individual trees. In this study, we used a comprehensive dataset to investigate the consistency of predicted hydraulic vessel diameter widening values in relation to the distance from the tree apex, represented by the relationship Dh ∝ Lβ (where Dh is the hydraulic vessel diameter, L the distance from the stem apex and β the scaling exponent). Our analysis involved 10 Fagus sylvatica L. trees sampled at two distinct sites in the Italian Apennines. Our results strongly emphasize that vessel diameter follows a predictable pattern with the distance from the stem apex and β ~ 0.20 remains consistent across cambial age and climates. This finding supports the hypothesis that trees do not alter their axial configuration represented by scaling of vessel diameter to compensate for hydraulic limitations imposed by tree height during growth. The study further indicates that within-tree variability significantly contributes to the overall variance of the vessel diameter-stem length exponent. Understanding the factors that contribute to the intraindividual variability in the widening exponent is essential, particularly in relation to interspecific responses and adaptations to drought stress.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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