Factor Affecting the rate of Transpiration

Factor Affecting the rate of Transpiration

As you know the transpiration of plants is occurred through stomata present in the leaves of a plants. So the rate of transpiration of the plant is directly or indirectly controlled by the opening and cl9osing of stomata and it is occurring under the influence of light. The rate of transpiration is slow or none at dim or absence of light but on the other hand rate of transpiration is very strong at strong light when sun is at the peak. Many other factors present which effect the rate of transpiration. Some of these factors are given below;

Temperature

When the temperature of surrounding increases the humidity in the air is reduced and that why due to low humidity the kinetic energy of the molecules of water are increases. By this way it is increases the rate of transpiration. The rate of transpiration is double or two time higher with every rise of 10* C in temperature. But at very higher when temperature is about 40-45* C causes closure of stomata. and at these temperature stomata closed and plant does not lose much water anymore.

Leaf surface area

Transpiration also depend upon the surface area of leaf. when the surface area of leaf is large its provide more stomata and there is more transpiration

Air Movement

When the wind below it carries away the evaporated water from the leaves and it causes in the increasing in the rate of transpiration from the surfaces of mesophyll. And when air is still the rate of transpiration is reduced.

Air Humidity

when air is dry,Water vapors diffuse more quickly from the surface of mesophyll cells into the leaf air spaces and then from air spaces to outside. This increases in the rate of transpiration. When the air is humid the rate of diffusion of water vapors is reduced and the rate of transpiration is decreases.

Significance of Transpiration

Transpiration processes is useful as well as harmful for the plants. That’s why it is also called a necessary evil. It is harmful on the sense when the conditions are drought, loss of water from plant result in serious desiccation, wilting and often death.

But on the other hand, transpiration is necessary too. It creates a pulling force called Transpirational pull. which is responsible for condition of water and salts from roots to the aerial parts of plant body.