Plant Growth Regulators

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What are plant growth regulators?

Plant growth regulators (PGRs) are chemicals that influence plant growth and development, including hormones produced naturally by the plant.

What role do auxins play in plant growth?

Auxins regulate cell elongation, phototropism, and gravitropism, and they stimulate root initiation.

How do cytokinins affect plants?

Cytokinins promote cell division and delay leaf senescence, influencing nutrient mobilization and chlorophyll synthesis.

What is the function of gibberellins in plants?

Gibberellins stimulate stem elongation, seed germination, and flowering.

What effect does ethylene have on plants?

Ethylene promotes fruit ripening and leaf senescence and regulates responses to stress.

How do abscisic acid functions differ from other plant growth regulators?

Abscisic acid primarily maintains seed dormancy and regulates stress responses, differing from other PGRs that often promote growth.

What is phototropism, and which PGR is responsible for it?

Phototropism is the growth of plants in response to light, primarily influenced by auxins.

What is the significance of plant hormones in agriculture?

Plant hormones are used to enhance crop yields, regulate growth rates, and improve fruit development and ripening timing.

How are synthetic PGRs used in commercial agriculture?

Synthetic PGRs are used to manipulate growth, for instance, to prevent premature fruit drop or to enhance flower set.

What is the role of PGRs in seed germination?

PGRs like gibberellins promote seed germination by breaking dormancy and stimulating enzyme production.

Which PGR is primarily responsible for stimulating root growth?

Auxins are primarily responsible for stimulating root growth.

How is ethylene production influenced by stress factors?

Stress factors like wounding and drought increase ethylene production, which helps in stress adaptation.

What is the dual role of abscisic acid in plants?

Abscisic acid helps induce and maintain seed dormancy and is crucial for the plant's response to drought stress.

How do PGRs like cytokinins interact with cells?

Cytokinins promote cell division and influence differentiation, working closely with auxins.

What is the relationship between abscisic acid and seed dormancy?

Abscisic acid induces seed dormancy by preventing germination during unfavorable conditions.

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