Name and functions of plant hormone

There are five different types of plant growth regulators.
Auxin:

1. Auxin helps in cell enlargement by increasing the plasticity of the cell wall.
2. Auxin helps in promoting the growth of the plant’s tissue. Auxin is responsible for the phototropism and geotropism.
3. Auxin helps in promoting root initiation and stem cutting in plants.
4. Auxin inhibits the growth of lateral bud by stimulating the production of ethylene.

Cytokinins

1. Cytokinins help in stomatal opening.
2. Cytokinins help in delaying the senescence of leaves.
3. Cytokinins promote the expansion of cotyledons.
4. Cytokinins are involved in the enlargement of stem cells.

Gibberellins

1. Gibberellins help in controlling the elongation of the stem in young shoots.
2. Gibberellins help in seeds germination, enzyme production and food production, which is required for the new cells to grow.
3. Gibberellins help in increasing the number of fruits, the size of a fruit and also delay the ripening of fruits in citrus plants.
4. Gibberellins are also involved in seed germination.

Ethylene

1. Ethylene helps in stimulating fruit ripening and determining the *** of a flower.
2. Ethylene is involved in the production of female flowers in a male plant.
3. Ethylene helps in the root initiation of plants.
4. Ethylene increases the speed of senescence.

Abscisic acid

1. Abscisic acid helps in promoting bud dormancy and senescence of leaves.
2. Abscisic acid helps in the closing of stomata during Transpiration.
3. Abscisic acid inhibits detachment of plant parts.
4. Abscisic acid plays an important role in seed development, maturation and dormancy.