BRAINCAKEGibberellins
Gibberellins (GA) are plant growth regulators made in young leaves, shoot tips, roots and seeds.
Stem elongation
Gibberellins stimulate growth of the internodes (the parts of the stem between leaves) by promoting both cell division and cell elongation. Many dwarf plant varieties, such as dwarf peas, have a mutation that means they cannot make active gibberellin. Treating them with gibberellin makes them grow to normal height. In some plants, gibberellins also cause bolting, the rapid growth of a flowering stem.
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Key terms in this lesson
- plant growth regulator
- A chemical made in plant cells that alters growth or development, often at very low concentration and away from where it was made.
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