Page 7 - lesson notes-Plant Growth& Movement

Functions-

1. Cell elongation.

2. Breaking of dormancy.

3. Early maturity

4. Seed germination.

Cytokinins- the plant growth hormone is basic in nature. Most common forms include
kinetin, zeatin, etc. They are mainly synthesized in roots.

Functions-

1. Cell division and cell differentiation.

2. Essential for tissue culture.

3. Overcome apical dominance.

4. Promote nutrient mobilisation.

Ethylene – it is a gaseous hormone which stimulates transverse or isodiametric growth but
retards the longitudinal one.

Functions-

1. Inhibition of longitudinal growth.

2. Fruit ripening

3. Senescence

4. Promote apical dominance

Abscisic Acid – it is also called stress hormone or dormin. It acts as a general plant growth
inhibitor. Abscisic acid is produced in the roots of the plant and terminal buds at the top of

plant.

Function-

1. Bud dormancy

2. Leaf senescence

3. Induce Parthenocarpy

4. Seed development and maturation.

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