Difference Between Auxin and Gibberellin

An Overview

Like humans and animals, plants also have a chemical substance, which functions by controlling growth and development activities in the plant cell. Auxin and gibberellin are a group of naturally occurring and artificially synthesised plant hormones, also called plant growth regulators

What are plant growth regulators?

Plant growth regulators can be defined as chemical substances that control all the aspects of growth and development within plants. They are also referred to as plant growth hormones or phytohormones. Auxin, cytokinin, gibberellins, abscisic acid are some of the examples of plant growth regulators.

Auxin

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

Also Read: Parts of the plant

ibberellins

Gibberellins are the group of naturally occurring plant growth hormones, which play an essential role in the regulation of growth and influence various developmental processes, which include elongation of the stem, seed germination, flowering, enzyme induction, etc. There are more than 70 gibberellins isolated.

Explore more: Gibberellins in Plants

Let’s learn about the differences between auxin and gibberellin

Auxin and Gibberellin – Differences

Auxin

Gibberellin

Structure

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

Bolting

It does not cause bolting

It causes bolting in rosette plants

CallusGrowth

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.

Transport

Shows basipetal transport.

Both basipetal and acropetal transport.

Functions

Play a vital role in axial elongation, cell differentiation, cell division, cellular expansion, isodiametric expansion and lateral expansion in plants.

Play a vital role in seed germination, stem elongation, flowering, dormancy, sex expression, enzyme induction, leaf and fruit senescence.

Also Refer : Difference Between C3 And C4 Plants

This concludes some of the basic differences between Auxin and Gibberellin. Stay tuned with BYJU’S Biology for more differences and other Biology related topics.

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