Biocontrol of Litchi Downy Blight (Peronophythora litchi) by Zeamines, a New Type of Phytotoxin Prod

• 作 者: LiaoLisheng[1]LiuShiyin[1]LvMingfa[1]GuYanfang[1]ZhouJianuan[1]ChenShaohua[1]ZhangLianhui[2]
• 机 构: Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Natural Resou
• 出 处: 中国植物病理学会2014年学术年会
• 发表日期: 2014年期

　　The antifungal activity of a new type of long chain aminated polyketide named zeamines (ZMS), against Peronophythora litchi both in vitro and in vivo was investigated.ZMS treatment significantly suppressed mycelial growth and spore germination of P.litchi in vitro.ZMS at 5 μg/mL inhibited 95.8% of the germination of P.litchi spore.The results from scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed ZMS caused the ultrastructural modifications of P.litchii, including the distortion and depression of cell wall and endomembrane system, especially the plasma membrane, mitochondria, and vacuoles, which resulted in the cellular integrity damage.Futhermore, utilizing of ZMS significantly (P < 0.05) reduced decay and subdued peel browning of postharvest litchi fruit inoculated with P.litchi during storage at 2g℃.Overall, these results suggested that ZMS showed outstanding antifungal activity against P.litchii both in vitro and in vivo,which might provide a new strategy for the control of postharvest decay of litchi fruit.