BpMAPK6-mediated phosphorylation of BpDRE1B enhances drought tolerance in Betula platyphylla via activating glutathione S-transferase for antioxidant defense.

BpMAPK6 phosphorylation of BpDRE1B boosts drought tolerance in Betula platyphylla by activating glutathione S-transferase genes, increasing antioxidant defenses.

• Why it matters: Drought severely impacts birch survival, yet the genetic mechanisms behind its tolerance are poorly understood, limiting efforts to breed resilient varieties.
• What they did: Researchers identified and overexpressed the BpDRE1B gene, confirmed its regulation of BpGSTU8 via multiple assays, and demonstrated that BpMAPK6 phosphorylates BpDRE1B to enhance its activity.
• The result: This work reveals a signaling pathway where BpMAPK6 enhances BpDRE1B function, leading to increased glutathione S-transferase activity and improved drought resistance, guiding future breeding strategies.