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. 2022 Jan 19;9:uhab078. doi: 10.1093/hr/uhab078

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© The Author(s) 2022. Published by Oxford University Press on behalf of Nanjing Agricultural University

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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A model of DELLA and ARF/IAA function. a DELLA protein negatively regulates GA responses. In the presence of GA, the formation of a GA-GID1-DELLA complex leads to degradation of the DELLA protein by the 26S proteasome pathway, which promotes the expression of target genes (top panel). In the presence of auxin, the formation of an ARF-IAA complex leads to degradation of the IAA protein by the 26S proteasome pathway, which regulates the expression of auxin response genes (bottom panel). b The regulation of fruit growth by DELLA and the SlARF7/SlIAA9 pathway during tomato fruit development. DELLA and SlARF7/SlIAA9 regulate the GA biosynthesis pathway antagonistically. The additive regulation of fruit growth–related genes by DELLA and SlARF7/SlIAA9. 1, Protein–protein interaction between DELLA and SlARF7/SlIAA9. 2, GA treatment significantly reduced the enrichment of SlARF7 at the EXP5 locus. c DELLA and FveARF8 function in strawberry accessory fruit development. FveARF8 inhibits the expression of FveGID in strawberry accessory fruit development. 3, Protein–protein interactions between FveARF8 and DELLA.

Inline graphic — A model of DELLA and ARF/IAA function. a DELLA protein negatively regulates GA responses. In the presence of GA, the formation of a GA-GID1-DELLA complex leads to degradation of the DELLA protein by the 26S proteasome pathway, which promotes the expression of target genes (top panel). In the presence of auxin, the formation of an ARF-IAA complex leads to degradation of the IAA protein by the 26S proteasome pathway, which regulates the expression of auxin response genes (bottom panel). b The regulation of fruit growth by DELLA and the SlARF7/SlIAA9 pathway during tomato fruit development. DELLA and SlARF7/SlIAA9 regulate the GA biosynthesis pathway antagonistically. The additive regulation of fruit growth–related genes by DELLA and SlARF7/SlIAA9. 1, Protein–protein interaction between DELLA and SlARF7/SlIAA9. 2, GA treatment significantly reduced the enrichment of SlARF7 at the EXP5 locus. c DELLA and FveARF8 function in strawberry accessory fruit development. FveARF8 inhibits the expression of FveGID in strawberry accessory fruit development. 3, Protein–protein interactions between FveARF8 and DELLA.