
1) Growth regulator 2) Phytohormone 3) Plant hormone
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https://www.crosswordclues.com/clue/gibberellin

Gibberellins (GAs) are plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction, and leaf and fruit senescence. Gibberellin was first recognized in 1926 by a Japanese scientist, Eiichi Kurosawa, studying bakanae, the `foolish se....
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http://en.wikipedia.org/wiki/Gibberellin

any of a group of plant hormones that occur in seeds, young leaves, and roots. The name is derived from Gibberella fujikuroi, a hormone-producing ... [7 related articles]
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http://www.britannica.com/eb/a-z/g/30

A hormone used in plant production. Often used in Camellia blooms and in increasing the size of fruits.
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http://www.encyclo.co.uk/local/20077

<protein> Plant growth substance (phytohormone) involved in promotion of stem elongation, mobilisation of food reserves in seeds and other processes. Its absence results in the dwarfism of some plant varieties. Chemically all known gibberellins are gibberellic acids. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

Plant growth substance (phytohormone) 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 gibberellic acids.
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http://www.encyclo.co.uk/visitor-contributions.php

[
n] - a plant hormone isolated from a fungus
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http://www.webdictionary.co.uk/definition.php?query=gibberellin

A plant growth regulator that controls the elongation of internodes.
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https://www.encyclo.co.uk/local/22581

any of a class of growth hormones occurring in fungi and plants.
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https://www.infoplease.com/dictionary/gibberellin
No exact match found.