関連する実験動画
Updated: Jul 12, 2026

08:27
Visualizing Stromule Frequency with Fluorescence Microscopy
Published on: November 23, 2016
まとめ
衰老する葉のガード・セル・クロロプラストは,他の葉の細胞よりも長生きします. これは,葉が老化しても,口腔の制御を維持することを示唆しています.
科学分野:
- 植物生理学 植物生理学
- 葉の老朽化 生物学
- クロロプラストの機能
背景:
- メソフィル細胞のクロロプラストは,ガード細胞のクロロプラストよりも早く衰老する.
- 護衛細胞は,植物生存に不可欠な口腔機能を調節する.
- 葉の老化におけるクロロプラストの長寿を理解することは,植物の適応の鍵です.
研究 の 目的:
- 葉の老化期中のガード細胞のクロロプラストの長寿を調査する.
- 護衛細胞のクロロプラストが老朽化した葉で光合成活動を保持しているかどうかを判断する.
- 様々な植物種におけるガードセルクロロプラスト機能の保存を評価する.
主な方法:
- ガーディアン細胞とメソフィル細胞におけるクロロプラスト生存の比較分析.
- ジンコビロバのガード細胞のクロロプラストの光合成活動を評価するために,光束の一時的な測定を行いました.
- 各種の樹木と"年生植物種の老朽化した葉のストマトの行動に関する研究.
主要な成果:
- ガーディアン細胞のクロロプラストは,15種の葉の老化過程でメソフィルクロロプラストよりも著しく長い生存期間を示した.
- ジンコビロバでは,老朽化した葉は,守護細胞のクロロプラストが活発な電子輸送と光リン酸化を示す機能的な胃を示した.
- 胃口の開閉リズムが持続し,ジンコビロバの葉が黄色に変色した.
結論:
- 護衛細胞のクロロプラストは,葉の寿命を通して,著しく保存され,回復力があります.
- 葉は,老化過程で,機能的なガード細胞のクロロプラストによって仲介された活発なストマト制御を維持します.
- この回復力は,多年生木と"年生植物の重要な適応メカニズムを強調しています.
関連する概念動画
Regulation of Transpiration by Stomata
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
The Anatomy of Chloroplasts
Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...
Structure of Chloroplasts
A...
Anatomy of Chloroplasts
Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
Protein Transport to the Stroma
Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...
Protein Transport to the Outer Chloroplast Membrane
Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.

