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They are also referred to as plant growth hormones or phytohormones.

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

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

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It is a single or double unsaturated structure with a side chain.

It is a saturated tetracyclic gibbane structure without a side chain.

Found both in higher plants and fungi.

Auxin inhibits root growth at normal concentration.

Promotes the growth of shoot segments.

Promotes the growth of the intact shoot.

Genetically dwarf shoots, which do not elongate.

Genetically dwarf shoots, which often elongate

It causes bolting in rosette plants

It plays an essential role in callus growth.

Auxin does not help in breaking seed and bud dormancy.

Gibberellin plays a major role in seed germination, breaking seed and bud dormancy.

Auxin has a feminising effect on some plants.

Gibberellin has a masculinizing effect on some plants.

Both basipetal and acropetal transport.

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.