Xing Mengyu, Zhao Jing, Zhang Jingya, Wu Yinggu, Khan Raja Asad Ali, Li Xinyu, Wang Rui, Li Tingting, Liu Tong
Key Laboratory of Green Prevention and Control of Tropical Diseases and Pests, Ministry of Education, School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China.
Engineering Center of Agricultural Microbial Preparation Research and Development of Hainan, Hainan University, Haikou 570228, China.
J Agric Food Chem. 2023 Dec 13;71(49):19488-19500. doi: 10.1021/acs.jafc.3c03872. Epub 2023 Nov 8.
The postharvest losses of litchi caused by litchi downy blight are considerably high. We identified a natural antifungal volatile pyrone, 6-pentyl-2-pyran-2-one (6PP), synthesized by LS019-2 and investigated as biocontrol for litchi downy blight and preservation. 6PP significantly inhibited the growth and sporangial germination of , the causal agent of litchi downy blight, and caused severe cellular and intracellular destructions, as evidenced by electron microscopic analysis. Furthermore, in the treatment, the fruit kept better color, higher weight, and antioxidant activity, so it can maintain freshness and prolong shelf life. Metabolome analysis confirmed the decline of lipids and the accumulation of organic acids in litchi fruits in response to 6PP treatment. These effects from 6PP could alleviate disease effects and prolong the shelf life of litchi fruits. These findings suggested that 6PP could be a useful natural product to control downy blight disease and a new preservative of litchi fruits.
荔枝霜霉病造成的荔枝采后损失相当高。我们鉴定出一种由LS019-2合成的天然抗真菌挥发性吡喃酮，即6-戊基-2-吡喃酮（6PP），并对其作为荔枝霜霉病生物防治剂和保鲜剂进行了研究。6PP显著抑制荔枝霜霉病病原菌的生长和孢子囊萌发，并导致严重的细胞和细胞内破坏，电子显微镜分析证明了这一点。此外，在处理过程中，果实保持了更好的色泽、更高的重量和抗氧化活性，因此能够保持新鲜度并延长货架期。代谢组学分析证实，6PP处理使荔枝果实中的脂质含量下降，有机酸积累。6PP的这些作用可以减轻病害影响，延长荔枝果实的货架期。这些发现表明，6PP可能是一种控制霜霉病的有用天然产物，也是一种新型荔枝保鲜剂。
