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02:45Responses to Heat and Cold Stress
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
01:57Adaptations 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.
02:04Regulation 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.
02:03Xylem and Transpiration-driven Transport of Resources
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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並び替え
Same author
Correlative aging and transport of P(32) in corn leaves under the influence of kinetin.
Planta·2014
まとめ
トマトの葉の温度は,空気移動と口腔の開口の影響を受け,発汗によって変化します. 開いたストモータは,閉じたストモータと比較して,葉の温度が低くなる.
科学分野:
- 植物生理学 植物生理学
- 葉の熱特性 葉の熱特性
背景:
- 発汗は葉の温度に大きな影響を与えます.
- 空気の速度は,葉の表面の熱交換機構に影響する.
研究 の 目的:
- トマトのチラシの間の温度グラデーションを調査するために.
- 葉の熱調節における透汗と空気移動の役割を理解する.
主な方法:
- トマトのチラシの温度グラデーションを測定する.
- 変化する空気速度の影響を観察する.
- 自然に開いた葉の温度と,人工的に閉じた葉の温度を比較する.
主要な成果:
- トマトのパンフレット全体で有意な温度グラデーションが観察されました.
- 低気速での冷却における透析の有効性は最も高く,高速ではコンベクションが優勢である.
- 閉じた口腔を持つ葉は,閉じた口腔を持つ葉より約5°C涼しかった.
結論:
- 発汗は,葉の温度グラデーションを確立する重要な要因です.
- 光によって調節される口腔の開口は,葉の熱的ホメオスタシスにおいて重要な役割を果たします.
