淀粉耗竭率和水力衰竭率在干旱导致的秧苗死亡中都发挥了作用

IF 2.5 3区 农林科学 Q1 FORESTRY Annals of Forest Science Pub Date : 2024-08-02 DOI:10.1186/s13595-024-01246-7
Santiago Trueba, Noelia González Muñoz, Régis Burlett, Laurent J. Lamarque, Yves Gibon, Teresa E. Gimeno, Aurore Kaisermann, Camille Benard, Cédric Lemaire, Jose M. Torres-Ruiz, Lisa Wingate, Sylvain Delzon
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引用次数: 0

摘要

关键信息在试验性干旱条件下,淀粉浓度耗尽和达到零水力安全系数所需的时间与树苗死亡率有关。在脱水的早期阶段,所有树种的淀粉浓度都出现了加速下降,而可溶性糖和非结构性碳水化合物的总浓度则保持稳定。在干旱条件下,碳水化合物消耗和水力失调同时导致幼苗死亡。水力失调和非结构性碳水化合物(NSC)耗竭被认为是导致植物在干旱条件下死亡的主要机制。方法将幼苗置于干旱环境中,直至观察到100%死亡。干旱期间定期测量正午(ΨMD)和黎明前(ΨPD)水势、导致水力传导损失 50%的木质部压力(Ψ50)以及不同器官(叶、茎和根)中的 NSC 浓度。然而,随着ΨPD的降低,淀粉池在干旱胁迫早期出现了严重的减少,导致淀粉耗竭的时间成为预测死亡率的一个重要指标。结论通过估算淀粉储备和水力安全系数的消耗时间来采用动态方法,对于在当前全球干旱加剧的背景下提高树木死亡率的预测具有重要意义。
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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The rates of starch depletion and hydraulic failure both play a role in drought-induced seedling mortality

Key message

The elapsed times to deplete starch concentrations and to reach a null hydraulic safety margin were related to tree seedling mortality under experimental drought. Starch concentration showed an accelerated decline across all species during the early stages of dehydration, while the concentrations of soluble sugars and total nonstructural carbohydrates remained stable. Concomitant carbohydrate depletion and hydraulic failure drive seedling mortality under drought.

Context

Current upsurges of drought events are provoking impacts on tree physiology, resulting in forest mortality. Hydraulic dysfunction and nonstructural carbohydrate (NSC) depletion have been posited as the main mechanisms leading to plant mortality under drought.

Aims

This study explores the dynamics of the two mortality-inducing processes during drought stress using an experimental approach with 12 evergreen tree species.

Methods

Seedlings were subjected to drought until 100% mortality was observed. Midday (ΨMD) and predawn (ΨPD) water potentials, xylem pressure leading to a 50% loss of hydraulic conductivity (Ψ50), along with NSC concentrations in different organs (leaves, stems, and roots) were measured regularly during drought.

Results

Total NSC concentrations and soluble sugar pools did not decline during drought. However, starch pools showed strong reductions early during drought stress as ΨPD decreased, and the time leading to starch depletion emerged as a strong mortality predictor. Ψ50 alone did not provide an accurate estimate of mortality, while the elapsed time to reach a null hydraulic safety margin (ΨMD—Ψ50 = 0) was related to seedling mortality.

Conclusion

Adopting a dynamic approach by estimating the times to consume both starch reserves and hydraulic safety margins is highly relevant to improve predictions of tree mortality under the current context of increasing global drought.

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来源期刊
Annals of Forest Science
Annals of Forest Science 农林科学-林学
CiteScore
6.70
自引率
3.30%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Annals of Forest Science is an official publication of the French National Institute for Agriculture, Food and Environment (INRAE) -Up-to-date coverage of current developments and trends in forest research and forestry Topics include ecology and ecophysiology, genetics and improvement, tree physiology, wood quality, and silviculture -Formerly known as Annales des Sciences Forestières -Biology of trees and associated organisms (symbionts, pathogens, pests) -Forest dynamics and ecosystem processes under environmental or management drivers (ecology, genetics) -Risks and disturbances affecting forest ecosystems (biology, ecology, economics) -Forestry wood chain (tree breeding, forest management and productivity, ecosystem services, silviculture and plantation management) -Wood sciences (relationships between wood structure and tree functions, and between forest management or environment and wood properties)
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