What is stomatal index and how it is calculated?

Stomatal index is the percentage which the number of stomata form to the total number of epidermal cells, each stoma being counted as one cell. Stomatal index can be calculated by using the following equation: Stomatal Index = S x 100/E+S. Where, S= Number of stomata per unit area.

What is stomata 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.

How do you count stomatal numbers?

The density of stomata on a leaf is recorded per unit area, usually the number per sq mm.

1. A microscope is calibrated so that its field of view is known.
2. Its area can be calculated using formula.
3. Where.
4. r = radius of the field of view.
5. The area of the field of view is 0.13 mm 2.

What is stomata frequency?

Complete answer: Stomatal frequency means the number of stomata present per unit area of a leaf surface. Water availability, carbon dioxide concentration, temperature and light intensity are the environmental factors that change the stomatal frequency. Greater stomatal frequency is a result of water stress.

How is the stomatal index of a leaf calculated?

Stomatal index may be defined as the percentage number of stomata as compared to the total number of epidermal cells present in unit area of a leaf. Total number of epidermal cells include total number of stomata and other epidermal cells present in per unit area of leaf. Stomatal Index is calculated by using following formula-.

What is the average number of stomata per square millimeter?

The average number of stomata per square millimeter of epidermis is termed the stomatal number. The percentage proportional to the ultimate divisions of the epidermis of a leaf, which has been converted into stomata, is termed the stomatal index.

How to calculate stomatal frequency and epidermal cell density?

Stomatal frequency/ Stomatal density (SD). It is calculated by using the formula (Royer, 200): Epidermal cell density (ECD). It is calculated by using the formula: Stomatal index (SI). It is calculated using the given formula: 1 division =0.01 mm 27 ocular micrometer=40 stage micrometer 1 division= x x=40/270.01 mm . 1 division=0.0148 mm

How is stomatal conductance related to the size of the leaf?

Stomatal conductance, or the ability of materials to pass through the stomata of a leaf, is dependent on both the size of the stomata and the total density of stomata on the leaf (Holland and Richardson, 2009). This variable should relate to the rate at which water passed through the stomata of each plant during the transpiration lab.