10 Facts on Gibberellins
Not just a fun word to say, gibberellins are crucial in the natural process of breaking dormancy and other aspects of germination. Philip McIntosh provides some insight into the world of gibberellins.
In plant biology, gibberellins are one of the main five classes of plant hormones (the others being auxins, cytokinins, abscisic acid (ABA), and ethylene).
Unlike auxins, which encourage root growth, gibberellins are actually used commercially to delay fruit ripening, and otherwise limit plant growth and induces early fruitset as well as seedset. Therefore, its use in indoor growing must be approached carefully.
Here are 10 additional facts on gibberellins:
Gibberellins are Busy
The gibberellins are plant hormones that, among other things, are involved in stem elongation, seed germination, early development, and flower production.
Gibberellins Come in Many Forms
There are 126 known natural and synthetic gibberellins found in not only plants, but also in fungi and bacteria.
Named After a Fungus
Gibberellic acid (GA or GA3), the prototypical gibberellin, is the only hormone named after a fungus.
Gibberellins Go Back Decades
Researchers in pre-World War II Japan discovered that the rice pathogen Gibberella fugikuroi produced a substance causing “foolish seedling disease” in young plants. This substance turned out to be gibberellic acid.
Can Be Applied Directly to Plants
If GA is applied to a plant, it generally results in rapid stem elongation with increased inter-nodal distance.
Lack of Gibberellins Stunt Growth
Dwarfism in a plant is often, but not always, caused by a genetic defect in the pathway for GA production.
Useful in Genetic Studies
The dwarf-tall trait in pea plants that Gregor Mendel studied to unravel the basic laws of genetics results from either a defective or properly functioning gene coding for a protein required for the synthesis of GA.
GA is an Anti-inhibitor
It binds to other molecules inside the cell to prevent them from inhibiting the activation of specific genes. This allows the gene to be “turned on” to produce its product.
GA is used commercially in some countries to control plant development. For example, to delay fruit ripening.
High Quantities of Gibberellins are Rare
Since the activity of GA is quite powerful, the amount found in plants is relatively low. However, some studies indicate that concentrated GA is a carcinogen.
Written by Philip McIntosh | Science & Technology Writer, Teacher