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Plum Fruit Development Occurs via Gibberellin-Sensitive and -Insensitive DELLA Repressors
Islam El-Sharkawy1,2, Sherif Sherif2,3, Mahboob Abdulla4
1Florida A&M University, Center of Viticulture and Small Fruit Research, Tallahassee, Florida, United States of America.
Plos One
|January 12, 2017
Summary
Gibberellin (GA) signaling in plum fruit development involves DELLA proteins. Some DELLA proteins are degraded by GA, promoting growth, while a mutated form, PslRGA, resists degradation, irreversibly inhibiting growth.
Area of Science:
- Plant Biology
- Hormone Signaling
Background:
- Fruit development is regulated by hormonal signals, particularly gibberellins (GAs).
- DELLA proteins are key repressors of GA signaling, but their role in fruit development needs further clarification.
Purpose of the Study:
- To isolate and functionally characterize plum DELLA genes (PslGAI, PslRGL, PslRGA).
- To investigate the role of these PslDELLA proteins in GA-mediated plum fruit development.
Main Methods:
- Gene isolation and functional characterization in Arabidopsis.
- Expression profiling during plum fruit development.
- Analysis of protein-protein interactions (PslDELLA with PslGID1).
- Overexpression and mutant analyses in Arabidopsis.
Main Results:
- PslGAI and PslRGL function as typical DELLA proteins, degraded by GA via PslGID1 interaction.
- PslRGA has a degenerated DELLA domain, preventing PslGID1 interaction and GA-mediated degradation.
- Overexpression of PslDELLA proteins disrupted Arabidopsis growth, while PslRGA mutants showed constitutive, GA-insensitive growth inhibition.
Conclusions:
- Plum fruit development involves complex GA signaling pathways with differential regulation of DELLA proteins.
- PslRGA represents a unique, GA-insensitive DELLA protein that imposes strong growth repression.
- Understanding these DELLA protein functions is crucial for optimizing plum reproductive growth.
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