Lecture 3/7: Abscisic Acid & Ethylene

Cytokinin

A plant hormone involved in cell division and growth, particularly in cytokinesis.

Gibberellins

Plant hormones found in stems, roots, young leaves, and embryos, responsible for growth, germination, stem elongation, leaf growth, flowering, and fruit development.

Bolting

The rapid growth of the floral stalk in plants, often induced by gibberellins.

Abscisic Acid (ABA)

A plant hormone that inhibits growth and promotes seed dormancy, often associated with the plant's stress response.

Ethylene

A gaseous plant hormone involved in fruit ripening and the stress response of plants.

Imbibed

The state of a seed after it absorbs water, triggering germination.

Pre-fertilization

The state before fertilization when the ovule contains the egg.

Post-fertilization

The state after fertilization, when the embryo is formed within the seed.

Seed Dormancy

The period during which a seed is inactive and does not germinate, regulated by abscisic acid.

Germination

The process by which a seed develops into a new plant, often stimulated by gibberellins.

Senescence

The process of programmed cell death in plants, often regulated by ethylene.

Fruit Development

The process of fruit growth and maturation, influenced by plant hormones like gibberellins and ethylene.

Auxin

A plant hormone that promotes cell elongation and is involved in the regulation of growth.

Leaf Abscission

The process of leaves detaching from a plant, regulated by ethylene and auxin balance.

Triple Response

A plant's response to mechanical stress, involving slowed stem elongation, thickening of the stem, and sideways growth.

Cotyledon

The first leaves that appear from a germinating seed, providing initial nutrition to the plant.

Haploid

A cell or organism that has a single set of unpaired chromosomes, as seen in plant gametes.

Grapes and Gibberellins

Gibberellins can be sprayed to increase the size of grapes and aid in their development.