Does temperature affect the opening and closing of pores?

Generally speaking, increasing the temperature can increase the opening of pores. At 30 ~ 50℃, the stomata can reach the maximum opening. At low temperature (10℃), despite long-term illumination, it is still difficult to completely open the stomata. Increasing stomatal opening at high temperature is the protective mechanism of plants to heat, which can reduce plant body temperature by strengthening transpiration.

References:

Factors affecting stomatal movement /ptgk/ Wu Sheng/SW1/b04/200608/6040.html.

1. light

Illumination is the main factor affecting stomatal movement. Generally speaking, stomata are open in light and closed in darkness. Except Sedum, its stomata are open at night and closed during the day. These plants absorb carbon dioxide at night and store it in the form of organic acids, and reduce it by photosynthesis during the day. The amount of light required to promote stomatal opening varies with plant species. Tobacco only needs 2.5% of the total sunshine, while other plants are more demanding and need almost all sunshine. The effect of light on stomatal opening is caused by photosynthesis, and the related mechanism is as mentioned above.

2. Temperature

Generally speaking, increasing the temperature can increase the opening of pores. At 30 ~ 50℃, the stomata can reach the maximum opening. At low temperature (10℃), despite long-term illumination, it is still difficult to completely open the stomata. Increasing stomatal opening at high temperature is the protective mechanism of plants to heat, which can reduce plant body temperature by strengthening transpiration.

3. Leaf water content

Too high or too low water content in leaves will close pores. For example, when leaves are saturated with water, epidermal cells swell due to high water content, squeezing guard cells and closing stomata during the day. When transpiration is strong during the day, the guard cells lose too much water, and the stomata are closed even under light.

4. Carbon dioxide

The concentration of carbon dioxide has a significant effect on the opening and closing of stomata. Under light or dark conditions, low concentration can promote the opening of stomata, and high concentration can promote the closing of stomata.

5. wind

The breeze has no effect on the opening and closing of the stomata, while the strong wind urges the stomata to close and reduce the opening.

6. Chemical substances

Phenylmercury acetate, atrazine (2- chloro -4- ethylamino -6- isopropylamino-triazine) and acetylsalicylic acid can inhibit stomatal opening and reduce transpiration. Spraying low concentration abscisic acid solution on leaves can inhibit stomatal opening for several days, and take effect quickly. Stomatal of many plants can start to close within 2 ~ 10 minutes. Cytokinin can promote stomatal opening.