软弱的环节还是坚实的基础? 细根网络和茎对体栓塞的脆弱性
Beatrice L Harrison Day1,2, Craig R Brodersen1,2, Timothy J Brodribb1
1School of Natural Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia.
The New phytologist
|September 13, 2024
概括
细根对于吸水至关重要,通常被认为易受干旱影响. 这项研究揭示了细根与大多数物种的干栓塞耐药性相匹配或超过,挑战了以前的假设.
科学领域:
- 植物生理学 植物生理学
- 生态生态学 生态生态学
- 水文学的水文学
背景情况:
- 干旱诱导的树栓塞阻力是了解植物获取水的关键.
- 以前的研究表明,根是最容易受到栓塞的植物器官.
- 精细的根,对于水/营养吸收至关重要,在很大程度上被排除在血栓阻力研究之外.
研究的目的:
- 为了研究各种植物类的细根和茎胞栓塞阻力.
- 挑战在干旱条件下细根脆弱性的假设.
- 了解细根在整个植物液压路径中的作用.
主要方法:
- 使用了标准化的现场方法,包括光学方法和MicroCT.
- 血栓阻力在细根 (直径<2毫米) 和茎中测量.
- 研究了主要陆地植物群中的十种物种 (苗,针叶树,,白植物).
主要成果:
- 平均细根栓塞阻力在所有物种中达到或超过了茎阻力.
- 在十分之六的物种中,细根比茎更有显著的抗栓塞性.
- 细根西管径和脆弱性之间没有发现一致的关系.
结论:
- 精细的根不一定比茎更容易受到囊栓塞的伤害.
- 这一发现为水吸收地点的工厂液压路径提供了新的见解.
- 这项研究挑战了对干旱压力期间细根脆弱性的普遍观点.
相关概念视频
02:03Xylem and Transpiration-driven Transport of Resources
23.5K
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.
23.5K
02:41Responses to Drought and Flooding
10.6K
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.
10.6K
02:34Water and Mineral Acquisition
32.6K
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.
32.6K
00:53Tonicity in Plants
53.2K
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.
53.2K
03:02Primary and Secondary Growth in Roots and Shoots
57.0K
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
57.0K
01:57Adaptations that Reduce Water Loss
25.2K
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.
25.2K