Thekey differencebetween root pressure and transpiration pull is that根压是osmotic pressuredeveloping in the root cells due to movement of water from soil solution to root cells while transpiration pull is the negative pressure developing at the top of the plant due to theevaporation的waterfrom the surfaces ofmesophyllcells.
木质部和韧皮部are the two main complex tissues that are in the vascular bundle of plants. Xylem transports water and minerals from the root to aerial parts of the plant. The ascent of sap is the movement of water and dissolved minerals through xylem tissue invascular plants. Plant roots absorb water and dissolved minerals from the soil and hand them over into the xylem tissue in the roots. Then the xylem tracheids and vessels transport water and minerals from roots to aerial parts of the plant. The ascent of sap takes place due to passive forces created by several processes such as transpiration, root pressure, and capillary forces, etc.
内容
1.Overview and Key Difference
2.What is Root Pressure
3.What is Transpiration Pull
4.Similarities Between Root Pressure and Transpiration Pull
5.并排比较,根压vs交易nspiration Pull in Tabular Form
6。概括
What is Root Pressure?
Root pressure is the osmotic pressure or force built up in the root cells that pushes water and minerals (sap) upwards through the xylem. Due to root pressure, the water rises through the plant stem to the leaves. There is a difference between the water potential of the soli solution and water potential inside the root cell. Root hair cell has a low water potential than the soil solution. Hence, water molecules travel from the soil solution to the cells by osmosis. When water molecules accumulate inside the root cells, a hydrostatic pressure develops in the root system, pushing the water upwards through the xylem. Therefore, root pressure is an important force in the ascent of sap.
通常在蒸腾拉力不会引起木质部含量张力的时间内看到根压。当茎在地上切下茎时,由于根压,木质部汁液将从切割茎上出来。此外,可以通过压力计测量根压。
一些植物物种不会产生根压。在简短的植物中,根压在很大程度上与通过木质部到植物顶部的水和矿物质有关。在高大的植物中,根压还不够,但部分贡献了SAP的提升。当蒸腾迅速发生时,根压会变得非常低。
What is Transpiration Pull?
蒸腾拉力是由于水从叶子的叶叶叶细胞蒸发到通过气孔到大气的叶片蒸发而在植物顶部的负压建筑物。当叶子中发生蒸腾时,它会在叶子中产生吸力压力。因此,它将水柱从下部的下部拉到植物的上部。
The transpiration pull of one atmospheric pressure can pull the water up to 15-20 feet in height according to estimations. It is the main contributor to the movement of water and mineral nutrients upward in vascular plants. Furthermore, transpiration pull requires the vessels to have a small diameter in order to lift water upwards without a break in the water column.
What are the Similarities Between Root Pressure and Transpiration Pull?
- Both root pressure and transpiration pull are forces that cause water and minerals to rise through the plant stem to the leaves.
根压和蒸腾拉之间有什么区别?
根压是由于水从土壤到根细胞通过渗透而移动而导致根部细胞中发生的渗透压。另一方面,蒸腾拉力是由于水通过叶肉汤细胞的气孔蒸发到大气中,因此在植物顶部发育的力。因此,这是根压和蒸腾拉力之间的关键区别。
此外,根压部分负责植物中水的升高,而蒸腾拉力是血管植物中水和矿物营养物质运动的主要促进者。因此,这也是根压和蒸腾拉之间的差异。此外,在有效进行光合作用时,在气孔打开之前的早晨,蒸腾拉力在中午高度高。
摘要 - 根压力与蒸腾拉
Root pressure and transpiration pull are two driving forces that are responsible for the water flow from roots to leaves. Root pressure is the force developing in the root hair cells due to the uptake of water from the soil solution. In small plants, root pressure contributes more to the water flow from roots to leaves. In contrast, transpiration pull is the negative force developing on the top of the plant due to the evaporation of water from leaves to air. It is the main contributor to the water flow from roots to leave in taller plants. This is the summary of the difference between root pressure and transpiration pull.
Reference:
1.“内聚力假设”。2011年2月4日Available here.
2.“木质部”。Wikipedia,Wikimedia基金会,2019年12月20日,Available here.
Image Courtesy:
1. “Image from page 190 of “Science of plant life, a high school botany treating of the plant and its relation to the environment” (1921)” ByInternet Archive Book Images(No known copyright restrictions) viaFlickr
2. “Transpiration Overview” By Laurel Jules – Own work(CC BY-SA 3.0)viaCommons Wikimedia
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