花和叶之间的液压差异主要是由压力-体积特征和水损失驱动的
Yi-Dong An1, Adam B Roddy2, Tian-Hao Zhang1
1Guangxi Key Laboratory of Forest Ecology and Conservation, Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, and State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Forestry, Guangxi University, Nanning, Guangxi, China.
Frontiers in plant science
|June 16, 2023
概括
花朵使用一个干旱避免策略,具有高水容量,在干旱期间保持水分. 这种策略允许花特征的独立进化,这对繁殖和生态系统服务至关重要.
科学领域:
- 植物生理学 植物生理学
- 血管精子生殖的繁殖方式
- 干旱应激适应 干旱应激适应
背景情况:
- 鲜花对血管精子繁殖和生态系统服务至关重要.
- 全球干旱需要了解花水平衡,但花液压仍然不太了解.
- 保持花的水分是对粮食安全和生态系统功能至关重要的.
研究的目的:
- 描述花朵和叶子在十种物种中的液压策略.
- 为了研究与水运输有关的解剖学和生理学特征,花与叶相比.
- 为了确定花朵是否与叶子相比采用了不同的液压策略,特别是在干旱条件下.
主要方法:
- 综合光和扫描电子显微镜用于解剖观察.
- 测量液压生理学,包括最小扩散导电率 (g_min) 和压力-体积 (PV) 曲线.
- 分析了船间坑道特征,液压容量 (C_T) 和协调特征演变.
主要成果:
- 鲜花的最小扩散导电 (g_min) 和液压电容 (C_T) 比叶子更高.
- 花在插槽坑特征上的变化较小,坑膜面积和孔径形状的差异较小.
- 花和叶的特征是独立进化的,占据了不同的多变量特征空间.
结论:
- 鲜花采用一种避免干旱的策略,通过保持高容量来弥补高g_min,防止水的潜在下降.
- 这种策略可能会放松对插槽坑特征的选择,允许独立的变化.
- 鲜花和叶子特征的独立进化表明,尽管有共同的起源,但它们的模块化发展.
相关概念视频
01:57Adaptations that Reduce Water Loss
25.8K
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.
25.8K
02:41Responses to Drought and Flooding
10.8K
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.
10.8K
02:03Xylem and Transpiration-driven Transport of Resources
24.2K
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.
24.2K
02:04Regulation of Transpiration by Stomata
28.5K
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.
28.5K
02:16Light Acquisition
8.5K
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.
8.5K
00:53Tonicity in Plants
53.7K
Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
53.7K