Plant hormones

by Jordyn Lewis

what is a hormone

Hormones a regulatory substance produced in an organism.

Hormones in plants are chemically produced by plants to regulate the growth process.

why do plants use hormones?

Plant hormones are basically human dna and genes but for plants,. The hormones affect the shape of the plant, seed growth, time of flowering, fruit development and ripening, and to sense light. They even affects the plants death. Each cell of the plant is capable of making hormones.without hormones plants would be mostly a mass of undifferentiated cells.

pictures of hormones

how does it work?

There are 5 types of plant hormones
  • Auxin
  • Cytokinins
  • Gibberellins
  • Abscisic Acid
  • Ethylene
Auxin does a couple different things in a plant, but its main role is to work with another type of hormone, cytokinins.It is found in a place where a lot of new cells are forming.


cytokinins promote cell division (cytokinesis).It is wherever there is actively growing tissue.they help delay aging in plants by increasing the amount of new protein that is made.


Gibberellins are most important in stems, fruits and seeds. Gibberellins also work with auxin when fruit is developing.


Abscisic Acid also called ABA slows growth, and is the main player in seed dormancy. for example seeds do not grow until the condition is right, this is due to ABA keeping it dormant. ABA is also responsible for drought tolerance and preventing more water loss.


Ethylene helps fruits ripen by making them softer, through the breakdown of the cell walls. Ethylene is actually a gas and is distributed through the air, not through the plant.