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How do gibberellins affect dwarf plants and rosette plants?
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plant development
The life cycle of the fern. (1) Clusters (sori) of sporangia (spore cases) grow on the undersurface of mature fern leaves. (2) Released from its spore case, the haploid spore is carried to the ground, where it germinates into a tiny, usually heart-shaped, gametophyte (gamete-producing structure), anchored to the ground by rhizoids (rootlike projections). (3) Under moist conditions, mature sperm are released from the antheridia and swim to the egg-producing archegonia that have formed on the gametophyte's lower surface. (4) When fertilization occurs, a zygote forms and develops into an embryo within the archegonium. (5) The embryo eventually grows larger than the gametophyte and becomes a sporophyte.
Gibberellins are a group of plant hormones that play a critical role in regulating stem elongation and overall plant development.12
Effects on Dwarf and Rosette Plants
- Dwarf Plants: Gibberellins stimulate the growth of main stems, effectively promoting height in dwarf varieties. For example, applying these hormones can transform dwarf peas into taller plants or cause dwarf corn to grow to a normal size.12
- Rosette Plants: These plants, such as carrots and lettuce, typically grow in a compact, low-lying form. Gibberellins are responsible for "bolting," a process where the plant undergoes rapid stem elongation. This natural transition is often triggered by environmental stimuli, such as exposure to cold or extended periods of daylight, which correlate with an increase in the plant's internal gibberellin content.12
By promoting cell elongation, gibberellins serve as essential growth promoters that allow plants to overcome genetic or environmental constraints on their height.12