Types of transpiration pdf

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Advertisement Advertisement. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads. Others Others. It, however, continues day and night because lenticels have no mechanism of closure.

This type of transpiration occurs through corky covering of the stems. Bark transpiration is very little but its measured rate is often more than lenticular transpiration due to larger area. In order to form vapours, water present inside the exposed parts of the plant requires a source of heat energy.

It is the radiant energy during the day and heat energy from the transpiring organ during the night. The atmosphere is rarely saturated with water vapours.

The dry air of the atmosphere has a high DPD or low water potential Such a high DPD or low water potential can overcome various types of resistances water molecules have to meet in changing from liquid phase to vapour phase and the movement of water vapours out of the transpiring organ. The intercellular spaces of the transpiring organ are almost saturated with water vapours.

When the stomata are open, the water vapours are drawn from the substomatal cavities to the outside air due to high DPD of the latter.

This increases the DPD of the substomatal air which draws more water vapours from the intercellular spaces. The latter in turn get water vapours from the wet walls of mesophyll cells. Stomatal transpiration will continue till the stomata are open. Mechanism of lenticular transpiration is similar to that of stomatal transpiration. Cuticle is not much permeable to water.

However, its molecules absorb water from the epidermal cells by imbibition. The imbibed water is slowly lost to the atmosphere which has a high DPD. Imbibition flow is reduced by the thickness of cuticle.

Therefore, a thick cuticle does not allow transpiration to occur through it. Cuticle is shrunken and thicker during the day but at night it expands and becomes loose. Therefore, cuticular transpiration can be more at night. Mechanism of bark transpiration is similar to that of cuticular transpiration. You must be logged in to post a comment. Leave a Reply Click here to cancel reply. We use cookies We use cookies to personalise content and ads, to provide social media features and to analyse our traffic.

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