相关实验视频

Updated: May 31, 2025

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Published on: March 9, 2021

在来自三个生物体的幼苗植物中,当极端情况同时发生时,热耐受性的适应被抑制

Rosalie J Harris¹, Philippa R Alvarez², Callum Bryant¹

¹Research School of Biology, The Australian National University, 134 Linnaeus Way, Acton ACT 2601, Canberra, Australian Capital Territory, Australia.

Conservation physiology

|January 24, 2025

概括

植物原产物对热耐受宽度 (TTB) 有轻微影响. 极端的温度,而不是生物,驱动了适应,炎热的日子改善了耐热性,但寒冷的夜晚对寒冷耐受性几乎没有影响.

科学领域:

植物生理学和气候变化适应.
生态学和生物群对环境压力的特定反应.

背景情况:

气候变化正在增加热极端的频率,需要了解植物的热耐受性.
植物起源和生物群可能会影响适应温度波动,影响生存和分布.

研究的目的:

在模拟的气候变化极端条件下,研究植物起源如何影响热耐受度 (TTB).
为了确定来自不同生物体的植物对炎热的日子和寒冷的夜晚的适应反应.
评估组合暴露是否比单个极端条件更广泛地扩大TTB.

主要方法:

在受控的炎热白天/寒冷夜晚条件下,研究了来自温带,沙漠和高山生物群的幼植物.
评估了热 (Tcrit-hot) 和冷 (Tcrit-cold) 的临界热门值,以及整体TTB.
使用因子设计来研究极端温度处理的单个和组合效应.

主要成果:

生物起源的影响较小;极端温度处理是热耐受性变化的主要驱动因素.
暴露于炎热的日子显著增加了所有物种的耐热性 (Tcrit-hot) 约3.5°C.
寒冷的夜晚对寒冷耐受性 (Tcrit-cold) 的影响很小,并且联合暴露导致对TTB产生对抗作用,降低了寒冷耐受性.
观察到对极端热的反应有显著的物种特异性变化.

结论:

植物适应热极端主要是由温度事件本身驱动的,而不是起源生物群.
在波动的温度下,TTB的双向扩张能力是有限的,在耐热和耐寒之间存在潜在的权衡.
了解特定物种的热适应对于预测植物社区对加剧气候变化的反应和告知保护战略至关重要.

关键词:

叶绿素的光效应叶绿素光效应这是PSII的基础.寒冷耐受性耐寒性耐寒性共同的条件共同的条件耐热性耐热性耐热性植物群落植物群落

更多相关视频

Thermal Limits Determination for Zooplankton Using a Heat Block

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

High-Throughput Assays of Critical Thermal Limits in Insects

High-Throughput Assays of Critical Thermal Limits in Insects

Published on: June 15, 2020

相关概念视频

Responses to Heat and Cold Stress

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

Responses to Salt Stress

Responses to Salt Stress

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.

Introduction to Plant Diversity

Introduction to Plant Diversity

From Water to Land

Decreased Body Temperature

Decreased Body Temperature

A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...