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Gibberellins (GAs) are an important phytohormone for plant growth and development.DELLA proteins are members of the plant-specific GRAS protein family and act as repressors of the GA signaling pathway.DELLA proteins are rapidly degraded in the presence of GA.Recently it have been reported that DELLA proteins inhibit transcription factors in several signaling through protein-protein interaction, but the downstream of DELLA proteins in GA signaling is still unknown.