概括
在植物叶子中观察到护卫细胞和表皮细胞之间的等离子体,这表明它在口腔运动机制中发挥了作用. 这些复杂的细胞连接对于植物生理学至关重要.
科学领域:
- 植物生物学 植物生物学
- 细胞生物学 细胞生物学
- 植物生理学 植物生理学
背景情况:
- 等离子体对植物细胞间通信至关重要.
- 防护细胞调节口腔的打开和关闭,这对于气体交换和透气至关重要.
- 了解护卫细胞结构是理解口腔功能的关键.
研究的目的:
- 为了研究尼科蒂安纳烟草和维西亚法巴护卫细胞中的等离子体的存在和结构.
- 确定护卫细胞和表皮细胞之间的等离子体的位置和复杂性.
- 评估等离子体在口腔运动中的潜在作用.
主要方法:
- 电子显微镜被用来观察等离子体.
- 分析的重点是姐妹护卫细胞之间的细胞壁,以及护卫细胞和表皮细胞之间的细胞壁.
- 细胞学检查等离子体的结构和外观.
主要成果:
- 在两种植物物种中,在姐妹护卫细胞的壁面以及护卫细胞和表皮细胞之间确定了plasmodesmata.
- 护卫细胞和表皮细胞之间的plasmodesmata主要在临床前壁沿的坑场中发现.
- 观察到的等离子体表现出复杂的分支结构,并且看起来在细胞学上是功能性的.
结论:
- 在护卫细胞和表皮细胞之间存在复杂的,功能性等离子体,这表明它们参与了口腔调节.
- 这些发现需要在解释口腔运动机制的模型中考虑plasmodesmata.
- 对守护细胞中的等离子体功能进行进一步的研究可能会揭示植物水关系和气体交换的新见解.
相关概念视频
02:32Plasmodesmata
The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.Intercellular junctions are a feature of fungal, plant, and animal cells alike. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal...
01:20Plasmodesmata
In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
01:19Contact-dependent Signaling
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
01:46The Apoplast and Symplast
Plant growth depends on its ability to take up water and dissolved minerals from the soil. The root system of every plant is equipped with the necessary tissues to facilitate the entry of water and solutes. The plant tissues involved in the transport of water and minerals have two major compartments - the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells and consists of cell walls, extracellular spaces, xylem, phloem, and tracheids. The...
01:14Cell Adhesion in Plants
Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
02:43Plant Cell Wall
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.Collenchyma and sclerenchyma cells, on the other hand, mainly occur in the outer layers of a plant's stems and leaves. These cells provide the plant with strength and support by either partially thickening their primary cell wall (i.e., collenchyma), or depositing a...