Effect of freeze-thaw treatments with different conditions on frost fatigue in three diffuse-porous trees.

IF 3.5 2区农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-09-08 DOI:10.1093/treephys/tpae115

Bolong Ma, Qingzi Lv, Ruihan Zhang, Junyao Zhang, Yue Wang, Jing Cai

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Abstract

None declared.Conflict of interestIn addition to inducing xylem embolism, freeze-thaw events can cause frost fatigue phenomena. Freezing temperature, freezing times, number of freeze-thaw cycles, and frost drought can affect the level of freeze-thaw-induced embolism, but it is unknown whether there is an effect on frost fatigue. We assessed whether these frost-related factors changed frost fatigue in the three diffuse-porous species by simulating freeze-thaw treatments under different conditions. We also proposed a new metric, embolism area, in place of embolism resistance, to more accurately quantify the shift of the vulnerability curve after experiencing freeze-thaw-induced embolism and refilling. Frost fatigue caused VCs of all species to change from S-shaped to double S-shaped or even R-shaped curves. When exposed to a freeze-thaw event, Acer truncatum showed strong resistance to frost fatigue, in contrast, Populus (I-101 × 84 K) and Liriodendron chinense were more vulnerable. Changing freezing temperature and times did not impact the response to frost fatigue in the three species, but a greater number of freeze-thaw cycles and more severe frost drought significantly exacerbated their fatigue degree. Considering that frost fatigue may be a widespread phenomenon among temperate diffuse-porous species, more work is needed in the future to reveal the mechanisms of frost fatigue.

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不同条件下的冻融处理对三种多孔树种霜冻疲劳的影响

利益冲突除了引起木质部栓塞外，冻融事件还会导致霜冻疲劳现象。冻结温度、冻结时间、冻融循环次数和霜冻干旱会影响冻融引起的栓塞程度，但是否会对霜冻疲劳产生影响尚不清楚。我们通过模拟不同条件下的冻融处理，评估了这些与霜冻相关的因素是否会改变三种多孔植物的霜冻疲劳。我们还提出了一个新的指标--栓塞面积，以取代栓塞阻力，从而更准确地量化经历冻融引起的栓塞和再充填后脆弱度曲线的移动。冻融疲劳导致所有物种的易损性曲线从 S 形变为双 S 形，甚至 R 形。当暴露于冻融事件时，Acer truncatum 对霜冻疲劳表现出很强的抵抗力，相比之下，杨树（I-101 × 84 K）和鹅掌楸（Liriodendron chinense）则更加脆弱。改变冻结温度和时间不会影响这三个物种对霜冻疲劳的反应，但更多的冻融循环次数和更严重的霜冻干旱会显著加剧它们的疲劳程度。考虑到霜冻疲劳可能是温带弥漫多孔树种中的一种普遍现象，今后需要做更多的工作来揭示霜冻疲劳的机理。

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来源期刊

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.