GSK3 regulates DOG1L4 to enhance pre‐harvest sprouting resistance in wheat

Key findings from this study

• The study found that GSK3 phosphorylates and stabilizes DOG1L4, a seed dormancy protein that activates ABI5.
• The researchers demonstrate that GSK3 also directly phosphorylates ABI5, creating a dual-target regulatory mechanism.
• The authors report that this mechanism integrates brassinosteroid and abscisic acid signaling to enhance seed dormancy.

Overview

GSK3 phosphorylates DOG1L4, a seed dormancy protein, to enhance pre-harvest sprouting resistance in wheat. GSK3 simultaneously phosphorylates ABI5, a transcriptional regulator downstream of abscisic acid signaling. This dual phosphorylation mechanism integrates brassinosteroid and abscisic acid pathways to regulate seed dormancy.

Methods and approach

The study employed protein phosphorylation analysis to identify GSK3 targets in seed dormancy regulation. Researchers investigated the functional interaction between GSK3, DOG1L4, and ABI5 within the abscisic acid signaling cascade.

Results

GSK3-mediated phosphorylation of DOG1L4 stabilizes the protein and enhances its capacity to activate ABI5. GSK3 also directly phosphorylates ABI5, indicating convergent regulation at multiple nodes. This dual-target mechanism amplifies abscisic acid signal transduction to strengthen dormancy maintenance.

Implications

The identified GSK3-DOG1L4-ABI5 axis provides a biochemical framework for understanding seed dormancy control in cereal crops. Manipulating GSK3 activity or its substrate interactions offers potential strategies to modulate pre-harvest sprouting resistance without compromising other developmental traits. The dual-target architecture suggests that targeting either substrate or kinase activity could yield agricultural phenotypes with enhanced dormancy.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.