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Water Uptake and Transport in Vascular Plants. Citation: Taub, D. Nature Education Knowledge 3 10 Photosynthetic assimilation of CO2 is central to the metabolism of plants. As atmospheric concentrations of CO2 rise, how will this affect the plants we depend on?
Aa Aa Aa. The effects of elevated CO 2 on plants can vary depending on other environmental factors. While elevated CO 2 makes carbon more available, plants also require other resources including minerals obtained from the soil. The effect of CO2 on both wheat cultivars was similar for all growth parameters. Similarly there were no differences in the response to high [CO2] between wheat grown hydroponically in growth chambers under fluorescent lights and those grown in soilless media in a glasshouse under sunlight and high pressure sodium lamps.
There was no correlation between high [CO2] and ethylene production by flag leaves or by wheat heads. Therefore, the reduction in seed set in wheat plants is not mediated by ethylene. There are several ways of measuring the rate of photosynthesis in the lab. These include:. These are not perfect methods as the plant will also be respiring, which will use up some oxygen and carbohydrate and increase carbon dioxide output.
Several factors can affect the rate of photosynthesis:. The amount of chlorophyll also affects the rate of photosynthesis:. Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide and a suitable temperature. Increasing the light intensity increases the rate of photosynthesis , until some other factor - a limiting factor - becomes in short supply.
At low light intensities the increase in the rate of photosynthesis is linear. At some point a factor becomes limiting. For instance, if carbon dioxide becomes the limiting factor the supply of carbon dioxide is not sufficient to keep pace with the increasing rate of reaction. Any additional increase in light intensity will not increase the rate of reaction any further. At very high light intensities, photosynthesis is slowed and then inhibited, but these light intensities do not occur in nature.
Carbon dioxide - with water - is one of the reactants in photosynthesis. If the concentration of carbon dioxide is increased, the rate of photosynthesis will therefore increase. Again, at some point, a factor may become limiting. The chemical reactions that combine carbon dioxide and water to produce glucose are controlled by enzymes.
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