Difference Between Auxin and Gibberellin

Difference Between Auxin and GibberellinLike humans and animals, plants contain chemical substances that function by regulating growth and development activities in plant cells. Auxin and gibberellins are a group of naturally occurring and synthetic plant hormones, also called plant growth regulators.

What is Auxin?

Auxins are a group of synthetic naturally occurring plant hormones. They play an important role in the regulation of plant growth. They are mainly produced in the apical meristem of leaves, young shoots and seeds.

What is Gibberellin?

Gibberellins are a group of naturally occurring plant growth hormones that play an important role in regulating growth and influencing various developmental processes, including root elongation, seed germination, flowering, enzyme secretion, etc. There are more than 70 gibberellins Neglected.

Difference Between Auxin and Gibberellin




It is a single or double unsaturated structure with a side chain. It is a saturated tetracyclic gibbane structure without a side chain.

Found in

Found in higher plants. Found both in higher plants and fungi.

Apical Dominance

Leads to apical dominance. Does not cause apical dominance.

Root Growth

Auxin inhibits root growth at normal concentration. There are no such effects

Shoot Growth

Promotes the growth of shoot segments. Promotes the growth of the intact shoot.

Leaf Growth

Has little effect on leaf growth. Enhances leaf growth.

Stem Elongation

Genetically dwarf shoots, which do not elongate. Genetically dwarf shoots, which often elongate


It does not cause bolting It causes bolting in rosette plants

Callus Growth

It plays an essential role in callus growth. It has no role in callus growth

Seed and Bud Dormancy

Auxin does not help in breaking seed and bud dormancy. Gibberellin plays a major role in seed germination, breaking seed and bud dormancy.

Root Formation

It promotes root formation. It does not promote rooting.

Hormonal Effects

Auxin has a feminising effect on some plants. Gibberellin has a masculinizing effect on some plants.


Shows basipetal transport. Both basipetal and acropetal transport.


In plants, axial elongation, cell separation, cell differentiation, cell elongation, uniaxial elongation and lateral elongation play important roles.

Seed germination, root elongation, flowering, dormancy, sexual expression, enzyme secretion and leaf and fruit senescence play an important role.

What are Plant Growth Regulators?

Plant growth regulators can be defined as chemical substances that control all aspects of growth and development in plants.

They are also called plant hormones or phytohormones. Auxins, cytokinins, gibberellins, and abscisic acid are examples of plant growth regulators.

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