相关实验视频
Updated: Jan 16, 2026

11:09
Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
19.7K
在Fagus sylvatica L. xylem的表型可塑性和个体间的变异性挑战了辅助迁徙的特征
Lucrezia Unterholzner1, Juliane Stolz1, Marieke van der Maaten-Theunissen1
1Chair of Forest Growth and Woody Biomass Production, TU Dresden, Tharandt, Germany.
The Science of the total environment
|September 28, 2025
概括
欧洲树 (Fagus sylvatica L.) 的表型可塑性和体特征因位点和特征而异. 保持遗传多样性是森林应对气候变化的关键,而不是选择特定的来源.
科学领域:
- 林业科学 林业科学
- 适应气候变化 适应气候变化
- 植物生理学 植物生理学
背景情况:
- 欧洲森林生态系统面临着气候变化和极端天气的重大威胁.
- 欧洲 (Fagus sylvatica L.) 对干旱非常脆弱,需要对其适应能力进行研究.
- 了解表型可塑性对于预测森林对环境变化的反应至关重要.
研究的目的:
- 为了研究表型可塑性在欧洲的体解剖特征中的作用.
- 评估试验地点的不同环境条件如何影响这些特征.
- 为了检查来源和人群内部变异对特征可塑性的影响.
主要方法:
- 量化木材解剖学被用来分析来自德国三个试验地点的15个来源的欧洲木的树木状特征.
- 测量的主要特征包括平均环宽 (MRW),平均容器面积 (MVA),容器密度 (VD),容器分组指数 (RVGI) 和导电面积百分比 (RCTA).
- 进行了统计分析,以区分现场条件,来源和个体树木变异性的影响.
主要成果:
- 场地条件显著影响了MRW,MVA和VD,这表明这些特征具有强大的环境可塑性.
- 来源对RVGI和RCTA有更大的影响,这表明对这些特定的树特征的遗传控制.
- 气候敏感性因地点而异,北部地区对温度更敏感,中部/南部地区对干旱更敏感;来源来源和干旱适应之间没有明确的联系.
- 个体树木的变异性发挥了实质性的作用,突出了人口内部遗传多样性的重要性.
结论:
- 欧洲木体解剖学的特征特异性可塑性使气候变化下的来源性能预测变得复杂.
- 保持种群内的高遗传多样性可能比选择特定来源进行辅助迁移更有效地提高森林弹性.
- 研究结果支持适应性森林管理策略,重点是为气候适应性保护遗传资源.
相关概念视频
Gene Flow
37.5K
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
37.5K
Xylem and Transpiration-driven Transport of Resources
26.3K
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
26.3K
Background and Environment Affect Phenotype
7.4K
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...
7.4K
Migration
8.8K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
8.8K
Frequency-dependent Selection
23.1K
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.
23.1K
Multipotency and Niche of Bulge Stem Cell
4.2K
A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
4.2K

