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How does gibberellic acid affect plant growth?
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Isoprenoid
Camphor, an isoprenoid compound classified as a terpenoid ketone, is used in incense and certain medicinal compounds. It is a natural substance obtained from the camphor laurel (Cinnamomum camphora), a species of evergreen.
Gibberellic acid is a gibberellin—a group of isoprenoid plant hormones—that plays a significant role in regulating plant development and growth.123
Its primary effects on plant growth include:
- Stem Elongation: Gibberellic acid stimulates the growth of main stems. It is notably involved in "bolting," the rapid elongation of rosette plants (such as lettuce or carrots) in response to environmental stimuli like long daylight hours or cold.13
- Growth Promotion: It can induce normal growth in dwarf plant varieties, such as dwarf peas or corn.13
- Seed Germination: During the germination of cereal seeds, gibberellin triggers the production of enzymes that break down stored starch into sugars, providing the energy necessary for the embryo to grow.4
- Abscission Inhibition: By promoting growth, gibberellins tend to inhibit abscission (leaf fall) and can help retard senescence in plant tissues.43
- Horticultural Applications: It is widely used to increase fruit size and induce seedlessness in certain grape cultivars.1