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Gibberellin: inhibitor of an inhibitor of...?

, : Gibberellin: inhibitor of an inhibitor of...?. Bioessays 20(12): 1001-1008

Present understanding of how gibberellin regulates plant growth is summarized, using recent results gained from studies of gibberellin-signalling mutants of Arabidopsis and their sequences. The following are discussed: a ga1-3 mutatnt, lacking ent-CDP synthase, which is highly GA-deficient; gai, which encodes a GA signalling function; GRS (GAI related sequence) and RGA, repressor of GA; SPY (spindly) a modulator of GAI and RGA function; and PKL (pickle), a gene whose product is involved in GAI-independent GA signalling. These results show that a signalling pathway represses plant growth and that gibberellin releases this repression. In consequence, the well-known growth-promoting properties of gibberellin are due to its activity as an "inhibitor of an inhibitor" of plant growth.


PMID: 10048300

DOI: 10.1002/(SICI)1521-1878(199812)20:12<1001::AID-BIES6>3.0.CO;2-O

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