Bromus tectorum基因型的现象敏感性取决于当前和源环境
Megan L Vahsen1, Toby M Maxwell2,3, Dana M Blumenthal4
1Department of Wildland Resources and the Ecology Center, Utah State University, Logan, Utah, USA.
Ecology
|March 17, 2025
概括
植物现象学是由直接的环境条件和进化历史形成的. Bromus tectorum (作弊草) 对当前环境和当地适应气候的快速开花反应,有助于其入侵成功.
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:
- 植物在应对环境变化时表现出表型可塑性 (一代内) 和局部适应性 (一代间).
- 了解塑性和适应植物现象学的相对贡献对于预测应对全球变化的反应至关重要.
- 开花现象学,一个关键的生命历史特征,对环境线索敏感,可以表明更广泛的生态反应.
研究的目的:
- 研究当前环境条件与源环境 (基因型起源) 对Bromus tectorum的开花表态的影响.
- 区分表型可塑性和局部适应性在塑造草开花时间方面的作用.
- 评估密度和温度的实验操纵对植物现象学的影响.
主要方法:
- 一个复制的常见花园实验,在四个地点进行了92个Bromus tectorum基因型.
- 植物接受了低密度与高密度,低温与高温 (2.1°C差异) 的因子处理.
- 测量了开花现象,并分析了当前环境 (密度,温度,位置) 和源环境 (原始气候) 的影响.
主要成果:
- 开花的现象学受到当前环境的强烈影响;更高的温度和更高的密度导致了更早的开花.
- 来自更温暖,更干燥的气候来源的基因型早些时候开花,这表明由自然选择塑造的基因气候差异.
- 现象学对当前的气候变化比对源气候变化更敏感,基因型对环境的相互作用最小.
结论:
- 在花期内,Bromus tectorum表现出显著的表型可塑性,以应对其当前的环境.
- 快速的本地适应源气候,由气候斜坡证明,也在开花现象学中发挥着关键作用.
- 塑性和局部适应性的结合有助于草的入侵成功及其适应未来环境变化的能力.
相关概念视频
Background and Environment Affect Phenotype
6.4K
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...
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...
6.4K
Biological Clocks and Seasonal Responses
34.5K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
34.5K
Light Acquisition
8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K
Responses to Heat and Cold Stress
13.3K
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.
13.3K
Adaptations that Reduce Water Loss
25.0K
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.
25.0K
Transcription
146.2K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
146.2K


