How to calculate leaf plastochron index?

How to calculate leaf plastochron index?

P. I. = Plastochron Index; n = it is the serial number of that leaf, which is 10 mm or just exceeds 10 mm length (counted from the base of the shoot); n + 1 = it is the succeeding leaf with a length that is less than 10 mm; Ln = length of n leaf; log 10 = it is the predetermined reference value of leaf length.

What is plastochron botany?

A plastochron is defined as the time interval between two successive recurring events during the growth of plant shoots, such as leaf initiation.

How do you determine a leaf’s age?

We propose a new method, the leaf measuring-interval index (LMI), to estimate leaf age in morphological and physiological studies of leaves. When the plastochron, the interval between the initiation of successive leaves, is constant, the well-known leaf plastochron index (LPI) provides a robust measure of leaf age.

Why are stomata located under the leaf?

Specialized cells known as guard cells surround stomata and function to open and close stomatal pores. Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. The majority of stomata are located on the underside of plant leaves reducing their exposure to heat and air current.

What are leaf primordia?

Leaf primordia are groups of cells that will form into new leaves. These new leaves form near the top of the shoot and resemble knobby outgrowths or inverted cones.

What is plastochron periodicity?

The periodic initiation of lateral organs by the SAM defines a developmental unit known as a plastochron, which gives the shoot time to extend before the next organ is initiated. Shoots are thus composed of nodes and internodes, the nodes bearing the lateral organs (usually leaves).

What is a leaf edge?

The edge of the leaf is called the margin. Parts of a leaf: A leaf may seem simple in appearance, but it is a highly-efficient structure. Petioles, stipules, veins, and a midrib are all essential structures of a leaf. Within each leaf, the vascular tissue forms veins.

Why are guard cells on the bottom of leaves?

Stomata are typically found in plant leaves but can also be found in some stems. Specialized cells known as guard cells surround stomata and function to open and close stomatal pores. The majority of stomata are located on the underside of plant leaves reducing their exposure to heat and air current.

What plant has stomata on top of leaf?

water lily
According to biologists at Colby College the leaf of the water lily has about 460 stomata per square millimeter on the upper surface of their leaves while many other plants, like the garden lily, have none at all.

What are the steps of leaf development?

Afterward, the transformation of the small leaf primordium to a mature leaf is controlled by at least six distinct processes: cytoplasmic growth (4), cell division (5), endoreduplication (6), transition between division and expansion (7), cell expansion (8) and cell differentiation (9) into stomata (9a), vascular …

Where is the apical bud?

(botany) The bud located at the top of the plant. Buds may be classified and described according to their different positions in a plant: terminal bud.

What is leaf trace and leaf gap?

A leaf gap is a space in the stem of a plant through which the leaf grows. The leaf is connected to the stem by the leaf trace, which grows through the leaf gap. The leaf gap is a break in the vascular tissue of a stem above the point of attachment of a leaf trace.