Control efficiency and potential mechanisms of 2,3-butanedione against potato leak caused by Pythium ultimum
文献类型： 外文期刊
作者： 冯慧;;石精涛;;赵栋霖;;彭志鑫;;郭富强;;张成省;;施宠;;徐康文
关键词： Pythium ultimum;;2;3-Butanedione;;Membrane integrity;;Phosphatidylcholine biosynthesis;;Mefenoxam
期刊名称： POSTHARVEST BIOLOGY AND TECHNOLOGY
ISSN： 0925-5214
年卷期： 2025 年
页码：
收录情况： SCIE（2025版）
摘要： Pythium ultimum is the principal postharvest pathogen responsible for Pythium leak disease in potatoes, causing significant yield losses during storage. 2,3-Butanedione is a naturally derived flavor compound, whose efficacy in controlling oomycete-induced postharvest diseases remains unclear. This study revealed that 2,3-butanedione inhibits P. ultimum mycelial growth (EC50 = 9.35 μL·L⁻¹) and reduces potato leak severity by 67.92 % at 2 ×EC50. Moreover, it exhibits broad-spectrum anti-oomycete activity by decreasing the susceptibility of pepper and eggplant to Phytophthora capsici and P. parasitica, respectively. Transcriptomic analysis indicated that 2,3-butanedione affects ABC transporters and phospholipids metabolism pathways in P. ultimum. Notably, it suppresses the synthesis of phosphatidylcholine (PC), a major cell membrane phospholipid, by downregulating genes involved in PC biosynthesis, such as the choline kinase gene PuCKI1. Molecular docking studies indicated a strong binding affinity between 2,3-butanedione and PuCKI1 (binding free energy = –3.91 kcal/mol), suggesting that the compound’s inhibitory effect on P. ultimum infection may be mediated through reduced PC accumulation, thereby increasing membrane permeability and damaging membrane integrity. Furthermore, the synergistic combination of 2,3-butanedione and mefenoxam (3:1 ratio) significantly reduces potato disease severity by over 59.65 % compared to mefenoxam alone. These findings provide a mechanistic basis and underscore the potential utility of 2,3-butanedione as a complementary agent in managing postharvest oomycete diseases in vegetable crops.
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