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Gibberellin is an endogenous plant growth regulator. Here, we describe our present understanding of how gibberellin regulates plant growth, using recent results gained from studies of gibberellin-signalling mutants of Arabidopsis. 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" Brian Pw. Sym Soc. Exp Bio 1957; 11:166-182 (Ref. 1) of plant growth.
Harberd et al. (Thu,) studied this question.
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