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ISSN: 2329-9029
Journal of Plant Biochemistry & Physiology
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Complete Procedure of Biochemical Reaction in Photolysis

Umasankar Dolai*
Garhbeta South CLRC, Dwarigeria, Satbankura, Paschim Dist, Medinipur, West Bengal, India
*Corresponding Author : Umasankar Dolai
Assistant Teacher, Garhbeta South C.L.R.C
Dwarigeria, Satbankura- 721 211
Dist-Paschim Medinipur, West Bengal, India
Tel: +919800172015
E-mail: [email protected]
Received February 08, 2016; Accepted March 21, 2016; Published March 29, 2016
Citation: Dolai U (2016) Complete Procedure of Biochemical Reaction in Photolysis. J Plant Biochem Physiol 4:165. doi:10.4172/2329-9029.1000165
Copyright: © 2016 Dolai U. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

The complete procedure of photolysis in photosynthesis is discussed in this paper. The complex ion tetrachloridomanganate (II) ion and the compound urea can play the roles in the analysis of water (H2O).

Keywords
Photolysis; Complex ion; Photon; Photosystem; Electron; Chlorophyll; Water molecule
Introduction
Photolysis is an important part of photosynthesis. A complex compound [Mn2+Cl-] of Mn2+ and Cl- ions can help to progress this process. But the nature of [Mn2+Cl-] and the pathway of photolysis are not known clearly at all. However modern inventions already show that to produce one molecule O2, 2 molecules H2O are analyzed; as well as 4H+ ions and 4e are also generated side by side in the complete procedure.
2H2O→4H++O2+4e
Here the mechanism of progressive pathway of photolysis is entirely discussed by the way of photoactive biochemical reactions.
The complex ion tetrachloridomanganate (II) ion i.e., [MnCl4]2- of Mn2+ and Cl- ions and the compound urea i.e., CO(NH2)2 are located in PS-II. [MnCl4]2- is photoactive and occurs photolysis by the helps of CO(NH2)2 and photon(hv) of light.
Chl-b (P680) emits an electron (e) to convert itself as active chlorophyll i.e., Chl-b* ((P+680) by absorption of photon and creates a strong electron-affinity in time of photosynthesis.
P680+hv→(P+680)+e
The above electron is accepted by electron- carrier plastoquinone (PQ) to stabilize active chlorophyll in PS-I i.e., Chl-a* (P+700) as the form Chl-a (P700) via other electron-carriers (cytochrome b6f complex and plastocyanine i.e., PC).
PQ+2e+2H+→PQH2-
It is remembered that the H+ ion of above reaction can be accepted from stroma and thrown into lumen of chloroplast due to the electronflow inside PQ for ATP synthesis by chemiosmosis.
In this situation, to decrease that electron-affinity [MnCl4]2- absorbs photon from light and converts itself as active tetrachloridomanganate (III) ion i.e., [MnCl4]- by emission of an electron (e).
[MnCl4]2-+hv →[MnCl4]-+e
This electron can enter into PS-II to stabilize that active chlorophyll i.e., Chl-b* ((P+680) to convert it into its stable state i.e., Chl-b (P680).
(P+680)+e→P680
Now four active [MnCl4]- ions can react with 8 molecules CO(NH2)2 and 2 water (H2O) molecules to produce four diureamanganese (II) ions i.e., 4[Mn{CO(NH2)2}2]2+, four molecules hydrochloric acid i.e., 4HCl and twelve chlorine ions i.e., 12Cl- for formation of one molecule oxygen i.e., O2.
4[MnCl4]-+8CO(NH2)2+2H2O→4[Mn{CO(NH2)2}2]2++O2+4HCl+ 12Cl-
Then HCl attracts H2O to generate hydronium ion i.e., H3O+ and Cl- in its hydrolysis.
HCl+H2O→H3O++Cl-
After production of H3O+, it is broken as H+ and H2O to throw H+ into lumen cavity of chloroplast from PS-II.
H3O+→H++H2O
As a result, pH level inside PS-II can be increased; as well as concentration of Cl- ion also be increase. In this situation, 4[Mn{CO(NH2)2}2]2+ ions and 16Cl- ions can react with each other to reproduce 4[MnCl4]2- ions and 8 molecules CO(NH2)2.
4[Mn{CO(NH2)2}2]2++6Cl-→4[MnCl4]2-+8CO(NH2)2
Photoactive [MnCl4]2- again absorbs photon of light by the influence of the electron-affinity of active chlorophyll (P+680) (produced again from stable chlorophyll P680 by absorption of photon of light and emitted electron again; which is again accepted by PQ in time of photosynthesis). In this way, the procedure of photolysis is going on in PS-II at the time of light reaction of photosynthesis [1-5].
Summary
The mechanism of the pathway of photolysis is clearly known in the above discussion. It is shown that finally 2 molecules H2O is analyzed through this process to develop 4H+ ions and one molecule O2. As well as four electrons (4e) are emitted by absorption of photons (hv) of light to restore the stability of active chlorophyll (P+680) as the form P680. The complete reaction-pathway of photolysis is drawn by the following way:
4P680+4hv→4(P+680)+4e
2PQ+4e+4H+→2PQH2-
4[MnCl4]2-+4hv→4[MnCl4]-+4e
4(P+680)+4e→4P680
4[MnCl4]-+8CO(NH2)2+2H2O→4[Mn{CO(NH2)2}2]2++O2+4HCl+12Cl-
4HCl+4H2O→4H3O++4Cl-
4H3O+→4H++4H2O
4[Mn{CO(NH2)2}2]2++16Cl-→4[MnCl4]2-+8CO(NH2)2
References

 

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Review summary

  1. MIREMBE
    Posted on Sep 23 2016 at 3:48 pm
    The complete procedure of photolysis in photosynthesis is discussed in this paper. A very nice, well-structured and informative study.
 

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