Difference Between Pericycle and Endodermis

Thekey differencebetween pericycle and endodermis is thatpericycle is a cylinder of实质或者硬核cells that surround the ring of vascular bundles in the stele, while endodermis is the cylinder of cells that separate the cortex from the stele.

Pericycle and endodermis are two types of cell cylinders seen in plant roots. Endodermis and pericycle lie close to each other. Structurally, pericycle lies just inside the endodermis. The endodermis is the innermost cell cylinder of the cortex while pericycle is the outermost cell cylinder of stele. Therefore, endodermis separates the cortex from the stele while pericycle marks the outermost boundary of stele. Both layers of cells are composed of ground tissues. However, pericycle is multilayered while endodermis is a single cell layer.

1.Overview and Key Difference
2.什么是周细胞
3.What is Endodermis
4.周围和内胚层之间的相似之处
5.并排比较 - 表格形式与内胚层
6.概括

什么是周细胞?

周细胞是位于内胚层内部的实质或硬核细胞的圆柱体。它也是将植物的碑石划分的最外面的细胞层。周周源于丙蜜邦。因此，可以将其视为vascular tissue.

Difference Between Pericycle and Endodermis

图01：周环

此外，它具有产生侧根的能力。在继发生长过程中，周环有助于血管形成。木质部在根部加载也需要周细胞。

什么是内胚层？

The endodermis is the innermost cortical cell layer. Therefore, it is the boundary of cortex and it separates cortex from the stele. It is a single cell layer of barrel-shaped cells. It surrounds the pericycle of roots and stems. Similar to pericycle, endodermis is also a nonvascular tissue. It is composed of parenchyma cells.

Key Difference - Pericycle vs Endodermis

Figure 02: Endodermis

内胚层的细胞壁具有CASPARIAN条，这是suberin的可耐水沉积物。在功能上，内胚层有助于调节周围皮质的水和溶解物质的流动。此外，内胚层在植物中存储淀粉。

What are the Similarities Between Pericycle and Endodermis?

Pericycle and endodermis are two cell layers found in plants roots and stems.
They are ground tissues.
Moreover, they are non-vascular tissues.
Pericycle lies just inside the endodermis.
Both pericycle and endodermis fulfil important functions in plants.

What is the Difference Between Pericycle and Endodermis?

Pericycle is the outermost cell layer of the stele in the root and stem of most plants. In contrast, endodermis is the innermost cortical cell layer that separates cortex from the stele. So, this is the key difference between pericycle and endodermis. Besides, another difference between pericycle and endodermis is that the pericycle is situated between the endodermis and the vascular bundles, while the endodermis is situated in between the pericycle and cortex.

Moreover, pericycle is multilayered while endodermis is a single cell layer. Also, pericycle is involved in xylem loading, lateral root initiation, and secondary growth. Meanwhile, endodermis helps to regulate the flow of water and dissolved substances from the surrounding cortex. Thus, this is the functional difference between pericycle and endodermis.

Below infographic summarizes the difference between pericycle and endodermis.

概括– Pericycle vs Endodermis

周细胞和内胚层是植物独有的两种细胞层。周围环绕根和茎的血管组织。它是石碑的最外层细胞层。同时，内胚层围绕周环。因此，内胚层是皮质的最内临细胞层。此外，周围有一个或两个细胞层，而内胚层是单个细胞层。同样，新的侧根根从周围开始生长，而内胚层则调节水和溶解的物质从周围皮质的流动。因此，这是周围和内胚层之间差异的摘要。

Reference:

1. Miyashima, Shunsuke, and Keiji Nakajima. “The Root Endodermis: a Hub of Developmental Signals and Nutrient Flow.” Plant Signaling & Behavior, Landes Bioscience, Dec. 2011,Available here.
2. “Top 4 Types of Ground Tissues in Plants (With Diagram): Botany.” Biology Discussion, 2 Feb. 2016,Available here.