Gibberellin A plant elongation growth regulator
GA3 was the first gibberellin to be isolated in its pure form and remains the most extensively studied. There are more than hundred gibberellins reported from the different organisms such as fungi and the higher plants.
👌👌Remember - Barley endosperm test and drop test are used as a bioassays of gibberellins.
The major sites of gibberellin production in plants are Apical shoot buds, young leaves near the shoot tips, root tips and the developing seed. Mevalonic acids is derived from acetyl coenzyme. ThIs the precursor of synthesis of gibberellic acid.
Describe this growth regulator is transported through simple diffusion as well as through the conducting channel.
Gibberellin hormone enhances seed germination by increasing the efficiency of synthesis of alpha - amylase and thus overcomes dormancy. In photoblastic seeds that is lettuce seed germination occurs by application of gibberellin even in dark. When gibberellin is sprayed on the rosette plant like cabbage there is Rapid expansion of internode and flowers with long stock are produced. This phenomenon is called bolting.
If gibberellin hormone is sprayed on a single gene dwarf plant, genetic dwarfism is overcome and the plant becomes long. This can be seen as maize, pea etc. On female plants male flowers are produced by the application of the gibberellin and thus it promotes maleness. They are also important and potent parthenocarpic agents. Gibberelic acid is used to speed up the malting process in brewers Industries. Spraying sugarcane crop with gibberellin increase the length of the stem thus increase the yield as much as 20 tons per acre. Spraying Juvenile conifers with gibberellin, increase the maturity period thus leading to early seed production.
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