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相关概念视频

Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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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.
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Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.  
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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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相关实验视频

Updated: Jan 11, 2026

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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在花热调节上以温度为依赖的授粉者为媒介的选择.

Matthew H Koski1, Jennifer S Apland1,2, Jacob M Heiling1,3

  • 1Department of Biological Sciences, Clemson University, Clemson, SC, 29634, USA.

The New phytologist
|November 17, 2025
PubMed
概括

植物通过改变花热量来适应温度. 这项研究表明,授粉者驱动植物在寒冷条件下升温,在温暖条件下降温的选择,从而影响植物的适应.

关键词:
花的进化是因为花的进化.地方适应 地方适应现型选择 现型选择花粉的生命力,花粉的生命力.授粉 授粉 授粉 授粉温度调节 温度调节

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科学领域:

  • 生态生态学 生态生态学
  • 进化生物学 进化生物学
  • 植物科学 植物科学

背景情况:

  • 热环境显著影响植物的生存和繁殖.
  • 植物通常无法控制其微气候,因此应对极端温度至关重要.
  • 花的特征可以改变热微环境,可能减轻极端温度对植物繁殖成功和与授粉者相互作用的负面影响.

研究的目的:

  • 量化对花温度调节的选择,定义为花温度与环境空气温度的偏差.
  • 为了研究花热调节的受粉媒介和活力选择,在阿根廷子 (Argentina anserina) 的两个种群.
  • 为了确定花温度的选择如何根据地理位置和环境温度而变化.

主要方法:

  • 量化授粉者介导和活力选择的花温度调节.
  • 利用三个健身组件来评估选择.
  • 在两个季节的阿根廷鱼*的高山和低海拔种群中比较的选择模式.

主要成果:

  • 在高海拔地区,授粉者更喜欢花变暖,种子数量增加和花粉出口增加证明了这一点.
  • 在较低的海拔上,选择有利于通过花粉在一个季节的活力来冷却花.
  • 跨越种群和年份,选择有利于在较冷的条件下进行花变暖,在较温暖的条件下进行冷却,这主要是受授粉者介导的选择驱动的.

结论:

  • 提供了第一个直接证据,证明了花温度调节的温度依赖性选择.
  • 选择模式的地理差异表明植物温度调节机制的局部适应.
  • 花的温度调节是环境温度和授粉者偏好影响的关键特征.