Plant Growth Regulators

Flashcards summarizing key terms and concepts related to plant growth regulators from the lecture notes.

Plant Growth Regulators

Also known as plant hormones, they are organic substances synthesized in one or multiple parts of a plant that influence physiological processes.

Auxins

A major group of plant growth regulators that promote cell elongation and are synthesized primarily in the apical meristem.

Cytokinins

Plant hormones that promote cell division, primarily synthesized in root tips and move through the xylem.

Gibberellins

Plant growth regulators that promote stem elongation, break seed dormancy, and enhance the growth of young plants.

Ethylene

A gaseous plant growth regulator associated with fruit ripening and senescence.

Abscisic Acid (ABA)

A natural growth inhibitor and stress hormone that promotes closing of stomata under water stress.

Parthenocarpy

The development of fruit without fertilization, resulting in seedless fruit.

Apical Dominance

A phenomenon where the apical bud inhibits the growth of lateral buds, primarily influenced by auxins.

Phototropism

The growth of a plant in response to light direction, promoted by auxins.

Gibberellic Acid (GA)

A type of gibberellin that aids in seedless fruit set and elongation of stems.

Senescence

The process of aging in plants, which can be prevented or regulated by hormones such as cytokinins and ethylene.

Abscission

The process of shedding leaves, fruits, or flowers, often influenced by ethylene.

Conjugation

A mechanism that deactivates plant hormones like growth regulators.

Micropropagation

A process that involves the use of plant hormones, particularly cytokinins and auxins, for successful plant cloning.