相关实验视频
Updated: Jan 15, 2026
11:09
Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
19.7K
牙尺寸的限制可以解释森林植物中牙密度的缩放
Congcong Liu1,2,3, Christopher D Muir4, Lawren Sack5
1Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing, 100081, China.
The New phytologist
|October 7, 2025
概括
较高的最大叶子气交换率不仅仅是通过最小化口腔面积或适应它来解释的. 结合口腔大小约束和选择的新模型提供了对森林植物口腔进化的更准确的理解.
科学领域:
- 植物生理学和进化生物学.
- 定量遗传学和生物物理学
- 生态学和全球变化生物学
背景情况:
- 讨论了最大叶导电率 (gs,max) 和口腔特征之间的关系.
- 存在两个相互竞争的假设:口腔区域最小化和口腔区域适应.
- 了解这些关系对于预测植物对环境变化的反应至关重要.
研究的目的:
- 为了测试口腔区域最小化和适应假设.
- 为了研究gs,max,口腔大小和密度的跨物种缩放.
- 使用合成模型将现有假设与经验数据相协调.
主要方法:
- 全球数据集 (2408个物种) 的家系学比较分析.
- 生物物理和进化定量遗传建模.
- 数学建模口腔大小,密度和表皮分配 (fS).
主要成果:
- 无论是最小化还是适应假设本身都不能充分解释数据.
- 标准回归方法在牙大小受到限制时,难以区分假设.
- 一个合成的"口腔适应 + 有界大小"假设调和了观察到的模式.
结论:
- 关于口腔特征进化的现有假设是不完整的.
- 口腔大小很可能是有界的,并且在选择中,影响缩放关系.
- 一个新的合成模型为了解口腔进化和功能提供了一个更强大的框架.
相关概念视频
02:04Regulation of Transpiration by Stomata
30.9K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
30.9K
02:16Light Acquisition
9.4K
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.
9.4K
02:12Short-distance Transport of Resources
17.4K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.4K
02:36Meristems and Plant Growth
49.1K
Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
49.1K
01:22Cell Size
125.3K
Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
125.3K
01:20Tonicity in Plants
32.3K
Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
32.3K