Effect of CO2 Concentration on Stoma of Different Plant Leaves

High concentrations of CO2 promote the growth of plant roots (including root weight, root length and root surface area) and seedlings. The response of different photosynthetic type plant roots to high CO2 concentration was different. The root differentiation and development characteristics of C3 plants changed obviously, and promoted the spring root branching of spring wheat, but had little effect on C4 plants. Because the root system is used as a library of photosynthetic products, the growth and development of the root system must be affected by photosynthesis in the aerial parts. The effect of doubled CO 2 concentration on photosynthetic activity of C3 plants is much greater than that of C4 plants. The CO2 test in the air can be measured using a CO2 recorder or a CO2 meter.

Leaf morphological structure of different photosynthetic types and different vegetation types had different responses to high CO2 concentrations: Leaf thickness of C3 plants increased significantly, such as Hordeum vulgare, Triticum aestivum, Semi-wild wheat (T. aestivum ssp.) .tibeticum), but C4 plants have no significant changes, such as millet (Setariaitalica), Sorghum vulgare, Setaria viridis, etc. The increase in leaf thickness is also related to the type of vegetation. Wild species such as Hordeum vulgare, Oryza granulata, Setaria viridis, Semi-wild wheat and other leaves are mainly thickened by upper and lower epidermal cells, while cultivated crops such as millet, barley and wheat are mainly Caused by mesophyll cell thickening. The chlorophyll content of C4 plant sorghum and maize and the number of chloroplasts in vascular bundle sheath cells were significantly higher than that of barley, rice, and wheat. At the same time, the number of starch granules in chloroplasts of C4 plants increased significantly, and the particle size increased, and the structure of photosynthetic membranes also had a certain degree. damaged. The doubled CO2 concentration caused a decrease in the stomatal density of the C3 plant leaf. This trend was basically stable in different climates and different historical periods, while the stomatal density of the C4 plant increased. The stomatal index of stomatal plants has a positive correlation with stomatal density. The increase of CO2 concentration causes the stomatal density of vascular plants to decrease. Sun Qidong studied the stomatal parameters of the plant during the geological history using the “closely related species” and the existing corresponding species. It showed that the atmospheric CO2 concentration in the geological history period showed an upward trend, while the stomatal density of shrubs, herbs, and woody plants showed a downward trend. .

It can be seen from the above that the CO2 concentration has a different effect on different plants. The CO2 concentration affects the stomatal density of the plant leaves and affects the photosynthesis of the plants. The CO2 recorder and the CO2 meter are used to perform air-to-air experiments. The CO2 concentration was measured and the data was analyzed to understand the demand of different plants for proper regulation.