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- This transfer of sugars (photosynthetic) from mesophyll cells to sieve tube elements in the leaf is called as phloem loading.
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What is phloem loading?
What is phloem unloading?
Is phloem loading symplastic or apoplastic?
What happens after phloem loading?
Learning Objectives. Distinguish between sources and sinks and provide examples of each. Explain the process of phloem loading, distinguishing between apoplastic and symplastic pathways. Explain how assimilate translocations through the phloem according to the pressure-flow hypothesis.
Phloem loading is specific and selective for transport sugars. Both symplastic and apoplastic pathways of phloem loading are used in plants but in different species. In some species however, phloem loading may occur through both the pathways in the same sieve tube element or in different sieve tube elements of the same vein or in sieve tubes ...
Phloem loading is the process of loading carbon into the phloem for transport to different ' sinks ' in a plant. Sinks include metabolism, growth, storage, and other processes or organs that need carbon solutes to persist.
Well, in the first step, we have loading where the sugars get loaded actively into the phloem tubes and this requires energy, that's why it's called as an active process and that's why these cells need to stay alive.
- 13 min
- Mahesh Shenoy
- At 8:46 , you say that the water flows back from the phloem to the xylem.But how is that possible?Xy...phloem has high concentration of water so it moves back
- At 11:56 why is water required to flow from xylem as the phloem sap is already highly concentrated, ...When the sugar gets loaded in the phloem the concentration becomes high water flows into phloem to decrease the concentration. And after bulk flow,...
- At 3:20, shouldn't the growing cell be above the grown cell in a typical plant?yes but,like in a potato plant, it would move sucrose into stores in the summer (when the plant produces excess sucrose being produces).this happen...
Phloem loading is the starting point for long-distance nutrient transport. By this process, solute is actively concentrated in the phloem of source organs, primarily mature leaves, thus generating hydrostatic pressure.
This process is termed translocation, and is accomplished by a process called phloem loading and unloading. Phloem sap is also thought to play a role in sending informational signals throughout vascular plants.
Phloem loading refers to the transfer of sugar from mesophyll cells (source) to sieve tube elements, and phloem unloading refers to the transfer of sugar from sieve tube elements to roots or other storage cells. Phloem Loading. There are two different types of phloem loading mechanisms.
