Original video: https://www.youtube.com/watch?v=QUK5F2fZxCc
Delivered on: 23 OCT 2023
The regeneration is the third phase of the Calvin cycle and is a complex process that requires ATP. In this stage, some of the G3P molecules are used to produce glucose, while others are recycled to regenerate the RuBP acceptor. In this session, we will explore more in details on the regeneration phase in Calvin cycle.
Video Transcript:
So, if you proceed with the Regeneration, you will undergo the full steps. That looks very worrying. So, what happens to these five molecules of G3P? So, these five molecules like I said they will undergo reshuffling, rearrangement, within these 10 steps of catalytically active reactions. You can see that there's so much enzymes being used here right. It involves isomerisation, it involves phosphorylation and some of these actually use uh ATP here. Can you see anybody using NADPH. You see? Now you learn another thing. There is an imbalance needs of ATP and NADPH you, see? NADPH kind of used once here, however, ATP you need here when you want to regenerate you want ATP again. So that's why when you learn the light reaction plants decide to do cyclic photophosphorylation. So that more ATP is generated to satisfy the needs of ATP in the Calvin cycle.
Right so in order to get three RuBP plus three carbons, how much NADP that you need? How much? Actually, for one CO2 right sometimes I forget this as well because my brain when it comes to number just refuse to remember. One CO2 it will needs two NADPH plus 3 NADPH is it written in there somewhere? I think it's written there somewhere. Oh yeah put it in summary. This sentence here, so at the end of the cycle, in order to assimilate each molecule of CO2, each molecule of CO2 you will need two molecules of NADPH, so molecules of NADPH and three molecules of ATP. But that is only one CO2 if you are talking about the net of it, this is the net okay net this is called net energy use. Because only…this is the only one that will exit to get your sugar precursor but the reality is you, use three molecules right? If you are following the reality how much actually NADPH and ATP? So, 2 * 3, 6 NADPH, 3 * 3, 9 ATP. That's one complete cycle. This is the net this is complete cycle. Okay? Right okay so okay uh up to that point now we'll continue this again.
Reference book: Plant Physiology and Development 7th Edition
by Lincoln Taiz, Ian Max Møller, Angus Murphy, Eduardo Zeiger
Full video: https://youtu.be/t1USGntKCfM?si=Me3PptSa5Gs_tuM_
Attribution 4.0 International — CC BY 4.0 - Creative Commons
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