ArticlePlant cell reports2025
The Radiation Sensitive 23B protein regulates root development partly through the E3 ubiquitin ligase EDA40.
Article in Plant cell reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Identification and characterization of QTL for grain protein content derived from the D genome of allohexaploid wheat.Frontiers in plant science · 2025Article
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5 authors.
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Abstract
key messageThe Radiation Sensitive 23B (RAD23B) protein functions upstream of the E3 ubiquitin ligase Embryo Sac Development Arrest 40 (EDA40), collaborating to regulate root architecture and affects the length of the root apical meristem. An optimal root system architecture plays a crucial role in water and mineral uptake in plants, primarily governed by the regulation of primary and lateral root development. Radiation Sensitive 23B (RAD23B), an ubiquitin-like/ubiquitin-associated (UBL/UBA) shuttle protein, mediates protein degradation through the ubiquitin/26S proteasome system (UPS) and is essential for plant root development. However, the mechanisms by which RAD23B regulates root development and whether this regulation depends on the UPS, are still unclear. In this study, an activation tagging-based suppressor screen was performed in the rad23b background, leading to the identification of Embryo Sac Development Arrest 40 (EDA40) as a new root growth regulator. EDA40 encodes an E3 ubiquitin ligase, which serves as a part of UPS. The overexpression of EDA40 rescues the root growth defects of rad23b, while the eda40 null mutant exhibits obvious root developmental defects. However, the overexpression of RAD23B is unable to suppress the root defects of eda40. Notably, the rad23b eda40 double mutant displays a root defect as severe as rad23b, suggesting that RAD23 may function upstream of EDA40. Together, these findings uncover a novel genetic relationship between RAD23B and EDA40 in root development and offer new insights into the role of the UPS in shaping root system architecture.
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