Plants can alter the size of their boundary layers around leaves through a variety of structural features. Temperature. Special cells called guard cells control each pore’s opening or closing. All rights reserved. Rate of transpiration depends on a number of factors, like carbon dioxide concentration, temperature, light, humidity etc. A mathematical model was developed to understand the evolution of water loss with temperature and relative humidity. Consquently, the rate of transpiration is increased in bright sunlight. Temperature Factors such as wind, light supply, temperature and water supply will affect the transpiration rate. Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place and therefore the rate of transpiration is greater. The main type of potometer is the ‘bubble’ potometer shown in the figure below. How does wind affect the transpiration rate of a plant? The rate of transpiration can be affected by: light intensity, air movement, temperature and humidity. Stomata are closed in the dark in most plants. Runoff & Infiltration: Definition & Process, What Is Transpiration in Plants? Transpiration rate increases at lower temperatures. Secondly, the water-holding capacity of warm air is greater than that of cold air. Transpiration. Many environmental factors also affect stomata openings for transpiration. Transpiration rate decreases at higher temperatures. Light Plants transpire more rapidly in the light than in the dark. When RH is high, the atmosphere contains more moisture, reducing the driving force for transpiration. It’s the same reason sweat does not evaporate from our skin when it’s too humid. The concept you can take away here is that the rates of photosynthesis and transpiration will get limited and affect each other if the environment doesn’t provide the factors they’ll need. The former can be minimized by leaf cooling, achieved through the evaporation of water from stomata, in a process known as transpiration 6, 7, 8.In well-watered conditions, plants consume considerably more water than is necessary for optimum yield, with the majority lost via transpiration . Effect of the Environment Factors on the Rate of Transpiration The quantitative rate of transpiration of the branch of papua dilaw was determined using the potometer. Environmental factors that affect the rate of transpiration. The rate of transpiration is inversely proportional to relative humidity. Morphological factors such as leaf surfaces, cuticle layer and number of stomata also affect transpiration rates; where heavy cuticle layer and low stomata count warrant low transpiration rates… Cuticle thickness varies widely among plant species. PLANT PARAMETERS – These plant parameters help plants control rates of transpiration by serving as forms of resistance to water movement out of the plant. © copyright 2003-2020 Study.com. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … The rates are higher on bright dry days and lowest at night or in drought conditions. Temperature affects the transpiration rate in two ways. Humidity was the variable with the greatest effect on transpiration rate. Wind – Wind can alter rates of transpiration by removing the boundary layer, that still layer of water vapor hugging the surface of leaves. Relative humidity – Relative humidity (RH) is the amount of water vapor in the air compared to the amount of water vapor that air could hold at a given temperature. Plants transpire more rapidly at higher temperatures. Thus, more the humidity lesser the rate of transpiration and vice versa. The rate of transpiration is inversely proportional to relative humidity. Stomata open in light and close in darkness. answer! Transpiration won’t happen at higher temperatures. increases the rate of transpiration. Temperature. - Definition & Examples, What Is the Carbon Cycle? Result and Discussion 1. Morphological factors such as leaf surfaces, cuticle layer and number of stomata also affect transpiration rates; where heavy cuticle layer and low stomata count warrant low transpiration rates… 1. Temperature: if the temperature goes up, the rate of transpiration is also bound to go up. Transpiration increases because at warmer temperatures plants open up their stomata and release more water vapor. The rates are higher on bright dry days and lowest at night or in drought conditions. Leaves that possess many hairs or pubescence will have larger boundary layers; the hairs serve as mini-wind breaks by increasing the layer of still air around the leaf surface and slowing transpiration rates. Plants transpire more rapidly at higher temperatures. Air movement and humidity are linked. Learn Factors That Affect The Rate of Transpiration with free interactive flashcards. The amount of water vapour present in the air at a particular time and temperature is expressed as a percentage of the amount required for saturation at the same temperature. Transpiration is the evaporation of water from the spongy mesophyll cells followed by the diffusion of water through the air spaces and out of the stomata. How does temperature affect the rate of transpiration? Four abiotic factors affect the rate of transpiration in a typical terrestrial plant: Light - The rate of transpiration is much greater when light is available as the stomata close in the dark. When the leaves were not subject to wind, the average transpiration All other trademarks and copyrights are the property of their respective owners. Sciences, Culinary Arts and Personal Humidity was the variable with the greatest effect on transpiration rate. The rate of transpiration is fastest when air temperature is between 20°C to 30°C (Moore et al. Soil water – The source of water for transpiration out of the plant comes from the soil. 2011b). Because warmer air can hold more water, its relative humidity is less than the same air sample at a lower temperature, or it is ‘drier air’. Factors that affect the rate of transpiration includes wind speed, light intensity, temperature and humidity. High temperature increases the risk of both heat damage and water shortage to plants. During daytime in the sunlight, the rate of transpiration is faster. Transpiration is affected greatly by the environment factors such as temperature, light relative humidity, wind, and so on. In addition, leaves that develop under direct sunlight will have much thicker cuticles than leaves that develop under shade conditions. Stomata open in light and close in darkness. Environmental conditions can affect the speed at which transpiration takes place. Others alter the plant’s ability to control water loss. 6) [2] [3] Temperature plays a major role in the rate of transpiration. Other factors that affect transpiration include: Type of plant: plants in arid areas are likely to have adaptations that make transpiration rate slow. This layer of air is not moving. Environmental conditions can affect the speed at which transpiration takes place. Which part of the water cycle is a biological... How are evaporation and transpiration similar? Plants with adequate soil moisture will normally transpire at high rates because the soil provides the water to move through the plant. 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