Difference Between Photosystem 1 and Photosystem 2

Thekey difference在光系统1和光系统2之间the photosystem 1 has a reaction centre composing ofchlorophyll aP700的分子在700 nm的波长下吸收光。另一方面，光系统II的反应中心包含叶绿素的p680分子，该分子在680 nm的波长下吸收光。

光系统是叶绿素分子，辅助色素分子，蛋白质和小有机化合物的集合。有两个主要的光系统；光系统I（PS I）和光系统II（PS II），存在于类囊体膜of chloroplasts in plants. Both carry out thelight reaction of photosynthesis. Accordingly, plants essentially need both these photosystems. It is because the stripping electrons from water require more energy than light-activated photosystem I can supply. Consequently, photosystem II can absorb shorter wavelength (higher energy) light and links in tandem to PS I, enabling non-cyclic electron flow.

内容

1.Overview and Key Difference
2.What is Photosystem 1
3.What is Photosystem 2
4.Similarities Between Photosystem 1 and Photosystem 2
5.并排比较 - 光系统1 vs photosystem 2表格形式
6。概括

What is Photosystem 1?

光系统I（PS I）是涉及植物和藻类光合作用的光合作用的两个光系统之一。我在光系统II之前发现的光系统。与PS II相比，PS I包含的叶绿素A比叶绿素B更多。同样，PS I存在于类囊体膜的外表面，并且比PS II容易可视化。此外，PS我参加了环状磷酸化并产生NADPH。

Moreover, there are two main parts in a photosystem such as an antenna complex (light-harvesting complex of pigment molecules) and a reaction centre. There are about 200-300 pigment molecules in a light-harvesting complex. Different pigment molecules are found in the photosystem to collect light and transfer from one to another and finally hand over to a specialized chlorophyll a molecule of the reaction centre. Photosystem I has a reaction centre composed of a chlorophyll a molecule of P700. It is capable of absorbing the light at wavelength 700 nm.

Key Difference Between Photosystem 1 and Photosystem 2

Figure 01: Light Reaction of Photosynthesis

当PS的轻度收获复合物吸收能量并移至其反应中心时，反应中心中的叶绿素A分子激发并释放出高能量电子。这些高能分子通过电子载体释放能量。最后，他们来到PS II的反应中心。当电子通过电子传输链传播时，它会产生NADPH。

什么是光系统2？

光系统II或PS II是涉及光合作用的第二光系统。它包含一个由叶绿素A分子p680组成的反应中心。PS II在680 nm的波长下吸收光。此外，它含有比叶绿素a更多的叶绿素B色素。PS II存在于类囊体膜的内表面中。PS II很重要，因为水的光解会与之相关。此外，光解会产生我们呼吸的分子氧。因此，与PS I相似，PS II对于所有生物体也非常重要。

Pigment molecules absorb light energy and transfer to P 680 chlorophyll molecules in the reaction centre of PS II. Hence, when P680 receives energy, it gets excited and releases high energy molecules. Consequently, primary electron acceptor molecules pick these electrons and finally hand over to PS I via going through a series of carrier molecules likecytochrome.

Difference Between Photosystem 1 and Photosystem 2

Figure 02: Photosystem II

When electrons are transferred through electron carriers of low energy levels, some of the energy released is used in the synthesis of ATP from ADP through a process called photophosphorylation. At the same time, light energy splits water molecules through the photolysis. Photolysis produces 4 water molecules, 2 oxygen molecules, 4 protons, and 4 electrons. These produced electrons replace the electrons lost from chlorophyll a molecule of PS I. Eventually, molecular oxygen evolves as a byproduct of photolysis.

What are the Similarities Between Photosystem 1 and Photosystem 2?

Both PS I and PS II participate in the light-dependent reactions of photosynthesis. They are equally important in photosynthesis.
They have two major parts such as antenna complex and reaction centre.
此外，它们包含光合色素，可吸收不同的阳光波长。
Also, both are present on the thylakoid membranes of the granna of chloroplasts.
Besides, reaction centre of each photosystem comprises a chlorophyll a molecule.

What is the Difference Between Photosystem 1 and Photosystem 2?

光系统I在其反应中心具有叶绿素的P700分子，而光系统II在其反应中心具有叶绿素p680分子。因此，PS I在700 nm的波长下吸收光，而PS II在680 nm的波长下吸收光。因此，我们可以将其视为光系统1和光系统2之间的关键区别。两个光系统都参与光合作用的光依赖性反应。然而，PS I参与环状磷酸化，而PS II涉及非循环磷酸化。因此，它也是光系统1和光系统2之间的区别。

此外，光系统1和光系统2之间的另一个区别在于，PS I富含叶绿素-A色素，而PS II富含叶绿素B颜料。同样，光系统1和光系统2之间的一个重要区别是光解过程。光解发生在PS II中，虽然它没有发生在PS I中。类似地，分子氧气从PS II中演变而来，而PS I中没有发生。此外，光合系统I存在于类囊体膜的外表面，而光合系统II则存在在类囊体膜的内表面。因此，这也是光系统1和光系统2之间的显着差异。

下面关于光系统1和光系统2之间的差异的信息图提供了有关这些差异的更多信息。

概括– Photosystem 1 vs Photosystem 2

Photosystem I and Photosystem II are two major photosystems that carry out light-dependent reactions of photosynthesis in plants. PS I involves in cyclic phosphorylation while PS II involves in noncyclic phosphorylation. The reaction centre of PS I contains chlorophyll a molecule of P700 while the reaction centre of PS II contains chlorophyll a molecule of P680. Accordingly, PS I absorbs light at a wavelength of 700 nm while PS II absorbs light at a wavelength of 680 nm. Photolysis of water and production of molecular oxygen occur associating the PS II while those two events do not occur in PS I. Thus, this is the summary of the difference between photosystem 1 and photosystem 2.