秋季粘虫(一汽),节食夜蛾,严重威胁粮食和经济作物。玉米,小麦,在中国许多地区,甚至有报道称,FAW对水稻造成了损害。迫切需要阐明FAW适应不同饲养宿主的机制,并开发有效的控制技术。使用两种性别生命表和16srDNA测序来确定饲喂四种不同食物类型时FAW的宿主适应性和肠道微生物多样性。考虑到生命史参数,蛹的重量,和养分利用指数,饲喂不同食物类型时,FAWs的宿主适应性按降序变化,如下所示:人工饮食,玉米,小麦,和米饭。饲喂不同食物类型时,肠道微生物组成和FAW的多样性差异显著,这些变化是由低丰度细菌驱动的。饲喂玉米的FAW的肠道微生物具有最高的多样性。具有显著丰度差异的肠道微生物的功能富集在营养和维生素代谢等与宿主适应密切相关的途径上。此外,我们确定了五个属(不动杆菌,Variovorax,假单胞菌,芽孢杆菌,和沙雷氏菌)和一个属(Rahnella),与寄主适应度呈正相关和负相关,分别。这项研究揭示了肠道微生物在FAWs宿主适应中的可能作用。
The fall armyworm (FAW), Spodoptera frugiperda, seriously threatens food and cash crops. Maize, wheat, and even rice damage by FAWs have been reported in many areas of China. It is urgent to clarify the mechanism which FAWs adapt to different feeding hosts and develop effective control technologies. Two-sex life tables and 16s rDNA sequencing were used to determine the host fitness and gut microbial diversity of FAWs when fed four different food types. Considering the life history parameters, pupa weight, and nutrient utilization indexes, the host fitness of FAWs when fed different food types changed in descending order as follows: artificial diet, maize, wheat, and rice. The gut microbial composition and the diversity of FAWs when fed different food types were significantly different, and those changes were driven by low-abundant bacteria. The gut microbes of FAWs that were fed with maize had the highest diversity. The functions of the gut microbes with significant abundance differences were enriched in nutrient and vitamin metabolism and other pathways that were closely related to host adaptation. Furthermore, we identified five genera (Acinetobacter, Variovorax, Pseudomonas, Bacillus, and Serratia) and one genus (Rahnella) that were positively and negatively correlated with the host fitness, respectively. This study revealed the possible role of gut microbes in the host adaptation of FAWs.