What is meant by stomatal conductance?
Stomatal conductance (gl) is a measure of the degree of stomatal opening and can be used as an indicator of plant water status. Stomatal conductance is related to leaf Ψ by feedback processes.
What is the relationship between stomata and transpiration?
Transpiration. Transpiration is water taken up from the soil and lost through the stomata in the leaves. This loss of water as vapor through stomata is directly related to the degree of stomatal opening, the supply of water to the leaves, and the evaporative demand of the atmosphere surrounding the leaf.
What’s the relationship between transpiration and photosynthesis?
The water, warmed by the sun, turns into vapor (evaporates), and passes out through thousands of tiny pores (stomata) mostly on the underside of the leaf surface. This is transpiration. It has two main functions: cooling the plant and pumping water and minerals to the leaves for photosynthesis.
How do you increase stomatal conductance?
Stomatal conductance increased with rising temperature despite the decrease in leaf water potential, increase in transpiration, increase in intercellular CO2 concentration and was decoupled from photosynthesis.
How does stomatal conductance affect photosynthesis?
In principle, increases in stomatal conductance (gs), which regulates gas exchange (CO2 and water), can allow plants under well-watered growth conditions to increase their CO2 uptake and subsequently enhance photosynthesis.
How does sunken stomata reduce the rate of transpiration?
The sunken stomata creates a small pocket of moist air. The high humidity in the air pocket reduces the water potential gradient between the leaf air spaces and the exterior, and therefore decreases the rate of transpiration.
What causes stomata to open and close?
Stomata are composed of two guard cells. These cells have walls that are thicker on the inner side than on the outer side. This unequal thickening of the paired guard cells causes the stomata to open when they take up water and close when they lose water.