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| Description: The gibberellin-DELLA system that controls growth of flowering plants evolved step by step. Although DELLA and GID1 proteins are present in a bryophyte, they do not interact, nor does gibberellin bind to GID1. In lycophytes, GID1 interacts with gibberellin and with DELLAs, but the system does not influence growth. The growth responses of gibberellin apparently evolved after the divergence of lycophytes.
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