Venation

The arrangement of veins and the veinlets in the lamina of leaf is termed as venation

Venation

When the veinlets form a network, the venation is termed as reticulate that possesses in dicotyledonous plants

When the veins run parallel to each other within a lamina, the venation is termed as parallel is the characteristic of most monocotyledons.

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Treadmilling

Because the critical concentrations for the two ends are different, at steady state the free ATP–G-actin will be intermediate between Cc+ and Cc - , so the (+)end will grow and the (-)end will lose subunits.

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The two ends of microfilament polymerize at different rates:

fast-growing end - plus end

slow-growing end - minus end

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Critical concentration (Cc)

minimal concentration of monomers at which filaments form

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The rate of addition of monomers is given by

rate constant kon (M–1 sec–1 )

The rate of loss is given by koff (sec–1)

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