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Gibberellins (GAs) are plant hormones involved in promotion of stem elongation, mobilization of food reserves in seeds and other processes. Its absence results in the dwarfism of some plant varieties. Chemically all known gibberellins are diterpenoid acids that are synthesized by the terpenoid pathway in plastids and then modified in the endoplasmic reticulum and cytosol until they reach their biologically-active form[1]. All gibberellins are derived from the ent-gibberellane skeleton, but are synthesised via ent-kauren. The gibberellins are named GA1....GAn in order of discovery. Gibberellic acid, which was the first gibberellin to be structurally characterised, is GA3. There are currently 136 GAs identified from plants, fungi and bacteria. Image File history File links Information. ... Image File history File links Gibberellin_A1. ... Image File history File links Gibberellin_A1. ... Image File history File links Gibberellic_acid. ... Image File history File links Gibberellic_acid. ... Gibberellic acid is a hormone found in plants. ... Image File history File links Ent-Gibberellane. ... Image File history File links Ent-Gibberellane. ... Image File history File links Ent-Kauren. ... Image File history File links Ent-Kauren. ... Plant hormones (or plant growth regulators, or PGRs) are internally-secreted chemicals in plants that are used for regulating the plants growth. ... A ripe red jalapeño cut open to show the seeds For other uses, see Seed (disambiguation). ... A biological process is a process of a living organism. ... see dwarf, and for insular dwarfism and other meanings see Dwarf (disambiguation). ... Chemical structure of the terpenoid isopentenyl pyrophosphate. ... Gibberellic acid is a hormone found in plants. ...
Much of our knowledge of the biosynthesis and molecular mechanisms of gibberellins comes from research on their role in triggering α-amylase release by the aleurone layer in seed germination. Gibberellin was first isolated in 1935 by Japanesescientist, Teijiro Yabuta (1888-1977) from the fungus Gibberella fujikuroi. 1935 (MCMXXXV) was a common year starting on Tuesday (link will display full calendar). ... This article does not cite any references or sources. ... For the toll-free telephone number see Toll-free telephone number Year 1888 (MDCCCLXXXVIII) was a leap year starting on Sunday (click on link for calendar) of the Gregorian calendar (or a leap year starting on Friday of the 12-day slower Julian calendar). ... Also: 1977 (album) by Ash. ... Binomial name (Sawada) Wollenw. ...
References
^ Cambell, Neil A., and Jane B. Reece. Biology. 6th ed. San Francisco: Benjamin Cummings, 2002.
External links
Phytohormones (Plant Hormones) and other Growth Regularors: Gibberellin
Chemically all known gibberellins are gibberellic acids, a family of diterpene acids that are synthesized by the terpenoid pathway in plastids and then modified in the endoplasmic reticulum and cytosol until they reach their biologically active form.
Much of our knowledge of the biosynthesis and molecular mechanisms of gibberellins comes from research on their role in triggering α-amylase release by the aleurone layer in seedgermination.
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