Is stomatal conductance the same as transpiration?

Stomatal conductance is a function of stomatal density, stomatal aperture, and stomatal size. Stomatal conductance is integral to leaf level calculations of transpiration (E).

What affects stomatal conductance?

Stomatal conductance is related to leaf Ψ by feedback processes. Reductions in gl prevent further decreases in Ψ by reducing transpiration; also, reductions in Ψ can induce stomatal closure, resulting in lowered gl. Stomatal conductance can be measured with both dynamic and steady-state diffusion porometers.

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.

What is the relationship between stomatal density and transpiration rate?

Transpiration is the evaporation of water through the stomates so my hypothesis states that the higher the rate of transpiration, the more stomata is found on the leaves of a plant. For further proof, I estimated the stomatal density from various orange and lemon trees.

What is transpiration rate?

The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14).

What is stomatal index?

In paleobotany, the ratio of the number of epidermal cells to the number of stomata in a given area of a leaf, times 100.

Is high stomatal conductance good or bad?

A decrease in stomatal limitations may be particularly advantageous for conifers, compared to broadleaves, as anthropogenic atmospheric [CO2] increases, due to a lower stomatal responsiveness to CO2 In summary, increased stomatal conductance at higher temperatures may help trees to increase rates of photosynthesis and …

What are the two factors that control the stomatal opening?

Light intensity and rate of loss of water (transpiration) are two factors that control the opening of stomata.

Does more stomata mean more photosynthesis?

A plant with high stomatal density will have a higher potential rate of photosynthesis, but the plant will then control the rate of photosynthesis by managing stomatal aperture, as a balancing act between inflow of CO2 and outflow of water (transpiration).

When stomata opens only at night they are called?

“When stomata open only at night they are called” photoactive.

How are transpiration and stomatal conductance related?

Here we estimate stomatal conductance and associated transpiration in a temperate deciduous forest directly on the canopy scale via two independent approaches: (i) from heat and water vapor exchange and (ii) from car- bonyl sulfide (OCS) uptake.

How is so conditioned molar flux related to stomatal conductance?

The so conditioned molar fluxes are for CO 2 the net CO 2 assimilation rate and for water vapour the transpiration rate. The stomatal conductance, or its inverse, stomatal resistance, is under the direct biological control of the leaf through its guard cells, which surround the stomatal pore.

What is the rate of CO 2 entering the stomata?

F. Chaumont, in Encyclopedia of Applied Plant Sciences (Second Edition), 2017 Stomatal conductance (mmol m −2 s −1) measured by a porometer is the rate of CO 2 entering, or water vapor exiting through stomata.

Are there any uncertainties in stomatal conductance estimates?

However, estimates of stomatal conductance based on sap or water vapor flux measurements involve assumptions (e.g. about evaporation, leaf temperature, and plant internal stor- age) that have contributed substantial uncertainty (Schäfer, 2011; Wehr and Saleska, 2015).