電子顕微鏡では,二コチラ状のガード細胞におけるプラズモデスマタの証拠が見つかっています
Science (New York, N.Y.)
|March 17, 1972
まとめ
プラズモデスマタは,ガードと表皮細胞の間の植物葉に観察され,ストマト運動機構における役割を示唆しました. これらの複雑な細胞結合は,植物生理学にとって不可欠です.
科学分野:
- 植物生物学 植物生物学
- 細胞生物学 細胞生物学
- 植物生理学 植物生理学
背景:
- プラズモデスマタは,植物における細胞間通信に不可欠である.
- 保護細胞は,ガス交換と透気のために不可欠な口腔の開閉を調節します.
- 護衛細胞の構造を理解することは,口腔機能を理解する鍵です.
研究 の 目的:
- Nicotiana tabaccumとVicia fabaのガード細胞におけるプラズモデスマタの存在と構造を調査する.
- 護衛細胞と表皮細胞の間のプラズモデスマタの位置と複雑さを決定する.
- ストマト運動におけるプラズモデスマタの潜在的な役割を評価する.
主な方法:
- 電子顕微鏡を用いて,プラズモデスマタを観察した.
- 分析は,姉妹ガード細胞間の細胞壁,およびガード細胞と表皮細胞の間の細胞壁に焦点を当てた.
- プラズモデスマタル構造と外観の細胞学的検査.
主要な成果:
- プラズモデスマは,姉妹ガード細胞の壁や,両方の植物種におけるガード細胞と表皮細胞の間で確認された.
- 護衛細胞と表皮細胞の間のプラズモデスマは,主にアンチクリナル壁に沿ったピットフィールドで見つかりました.
- 観察されたプラズモデスマは,複雑で枝分かれした構造を示し,細胞学的に機能しているように見えた.
結論:
- 護衛細胞と表皮細胞の間の複雑で機能的なプラズモデスマタの存在は,彼らのストマト調節への関与を示唆しています.
- これらの発見は,口腔運動のメカニズムを説明するモデルにおいて,プラズモデスマタを考慮することを必要としています.
- 保護細胞におけるプラズモデスマタル機能に関するさらなる研究は,植物水関係とガス交換に関する新しい洞察を明らかにする可能性がある.
関連する概念動画
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...