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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.
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
01:27C4 Pathway and CAM
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
02:40Epiphytes, Parasites, and Carnivores
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
02:12Short-distance Transport of Resources
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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El seguimiento solar por las plantas.
Science (New York, N.Y.)
|December 5, 1980
Resumen
Muchas especies de plantas exhiben movimientos diurnos de las hojas, rastreando el sol para optimizar la fotosíntesis o reducir la pérdida de agua. Este comportamiento de seguimiento solar es común en las plantas anuales del desierto, especialmente con temporadas de crecimiento más cortas.
Área de la Ciencia:
- Fisiología vegetal Fisiología vegetal
- Ecología Ecología Ecología.
- La fotosíntesis es la fotosíntesis.
Sus antecedentes:
- Muchas especies de plantas exhiben movimientos diurnos de las hojas.
- Las hojas se orientan perpendicular o paralela a los rayos del sol.
- Este fenómeno se observa tanto en las plantas C(3) como en las plantas C(4) de diversas familias.
Objetivo del estudio:
- Para investigar el fenómeno del movimiento diurno de las hojas en las plantas.
- Para entender el significado ecológico del seguimiento solar en anuales del desierto.
- Para correlacionar la orientación de las hojas con las tasas de fotosíntesis y la pérdida de agua.
Principales métodos:
- Estudios de observación sobre los movimientos de las hojas de las plantas.
Principales resultados:
- El movimiento diurno de las hojas, o seguimiento solar, está muy extendido en las plantas.
- En las anuales del desierto, el seguimiento solar aumenta con temporadas de crecimiento más cortas.
- Las hojas orientadas perpendicularmente al sol muestran tasas de fotosíntesis más altas.
- Las hojas orientadas paralelamente al sol exhiben temperaturas reducidas y pérdida de agua.
Conclusiones:
- El movimiento diurno de las hojas es una adaptación clave para optimizar el rendimiento de las plantas en entornos variables.
- El seguimiento solar equilibra las ganancias fotosintéticas con las necesidades de conservación del agua.
- Este comportamiento es crucial para la supervivencia y la reproducción, particularmente en los ecosistemas áridos.