Plant Hormones Introduction  

Gibberellin nomenclature

Gibberellins are assigned A-numbers in order of discovery according to the system proposed by MacMillan and Takahashi (Nature 217, 170-171, 1968).
Numbers will be assigned to novel GAs for which evidence is presented for their natural occurrence and an unequivocal assignment of structure. Identification can be established by:
a. Isolation of the pure compound and determination of structure from physical, primarily spectroscopic, properties.
b.Comparison of the compound with a fully-characterised synthetic standard by GC-MS or equivalent method. Matches are based on KRI and m/z values with relative intensities from a full spectrum.

For allocation of numbers to new GAs, the relevant information should be sent to:

Information on Abscisic Acid
Information on Auxins
Information on Cytokinins
Information on Ethylene
Information on Gibberellins


Gibberellin History

Structural and
Mass Spectral

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Links to other  sites

Dr Peter Hedden
IACR-Long Ashton Research Station,
Department of Agricultural Sciences,
University of Bristol,
Long Ashton,
Bristol, BS41 9AF, UK

Tel. +44-1275-549263

Fax +44-1275-394281



Dr. Yuji Kamiya
The Institute of Physical & Chemical Research (RIKEN)
Hirosawa 2-1,
Saitama 351-01

Tel +81-48-462-9375

Fax +81-48-462-4691


A list of the currently assigned GA numbers  is available here together with their structures.