Role of Gibberellin Hormone Receptors in Starting Fruit Growth in Arabidopsis

Gibberellin receptor GID1A plays a major role in fruit-set and growth in Arabidopsis.

• GID1A is expressed throughout the whole pistil, while GID1B is specific to ovules and GID1C is found in valves.
• Functional studies indicate that GID1A is crucial for fruit-set and growth, whereas GID1B and GID1C have distinct roles in seed development and pod elongation.
• In ovules, GA perception is mediated by both GID1A and GID1B, with GID1A and GID1C involved in perception in valves.
• GID1A can interact with DELLA proteins RGA and GAI across all tissues, while GID1C and GID1B interact with RGL1 and RGL2 only in valves and ovules, respectively.
• The findings indicate specific functions of GID1-DELLA interactions in various GA-dependent processes related to fruit-set.
• The distribution of GA receptors in valves suggests that gibberellins may be transported from developing seeds to stimulate fruit growth.

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