重温一个生态生理学奇特之处:来自非洲南部的Crassula物种的水介导的叶状水吸收
Marc Fradera-Soler1,2, Jozef Mravec1,3, Alexander Schulz1
1Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark.
Plant, cell & environment
|October 25, 2023
概括
克拉苏拉植物通过它们的水极体吸收水,这些结构通常用于水分泌. 这种叶子吸水 (FWU) 是水分收集的关键适应,即使在潮湿的地区,并且在整个属中广泛存在.
科学领域:
- 植物生理学 植物生理学
- 生态生态学 生态生态学
- 植物学 植物学
背景情况:
- 水管是植物结构,通常与化 (水排泄) 相关.
- 叶子通过水管吸收水 (FWU) 已被假设,但没有经验证实在Crassula.
- 克拉苏拉物种是南非多样化的多汁植物,许多适应干旱环境,雾和露水是关键的水分来源.
研究的目的:
- 实证地调查和确认Crassula.属的水介导叶片吸收水 (FWU) 的情况.
- 确定FWU在不同Crassula物种中的流行程度及其潜在的生态意义.
- 探索FWU,叶面特征和Crassula内部的地理分布之间的关系.
主要方法:
- 使用apoplastic光追踪器Lucifer Yellow来追踪水的运动.
- 采用了各种成像技术,可视化通过水极的染料吸收.
- 在南非干旱的西部和潮湿的东部地区检查了Crassula物种中的FWU.
主要成果:
- 证实,在Crassula物种中发生了水合介导的FWU.
- 观察到FWU似乎在整个属中广泛存在.
- 发现FWU在干旱和潮湿环境中的物种中运行,独立于地理分布.
- 没有发现FWU能力与叶面整体湿透性之间的直接联系;叶面上的微域可能有助于吸收.
结论:
- 在Crassula中,水管作为关键的水分收集结构,除了它们在化中的作用外.
- 管介导的FWU是Crassula的一个重要的生态生理学适应,为它们的进化成功做出了贡献.
- FWU的能力不仅限于适应干旱的物种或受到雾影响的环境,这凸显了大气湿度对各种Crassula种群的重要性.
相关概念视频
01:57Adaptations that Reduce Water Loss
25.6K
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.
25.6K
02:34Water and Mineral Acquisition
33.1K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
33.1K
02:40Epiphytes, Parasites, and Carnivores
13.0K
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
13.0K
02:41Responses to Drought and Flooding
10.7K
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.
10.7K
02:03Xylem and Transpiration-driven Transport of Resources
23.9K
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.
23.9K
02:02Responses to Salt Stress
13.2K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.2K