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J Invertebr Pathol

Title:		"Influence of the ascarosides on the recovery, yield and dispersal of entomopathogenic nematodes"
Author(s):		Wang J; Cao L; Huang Z; Gu X; Cui Y; Li J; Li Y; Xu C; Han R;
Address:		"Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, China; Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China. Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China. Yuxi Branch of Yunnan Tobacco Company, Engineering Center for Biological Control of Diseases and Pests in Tobacco Industry, Yuxi 653100, Yunnan Province, China. Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, China. Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, China. Electronic address: xchti@163.com. Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China. Electronic address: hanrc@giz.gd.cn"
Journal Title:		J Invertebr Pathol
Year:		2022
Volume:		20220111
Issue:
Page Number:		107717 -
DOI:		10.1016/j.jip.2022.107717
ISSN/ISBN:		1096-0805 (Electronic) 0022-2011 (Linking)
Abstract:		"Recovery, yield, and dispersal are crucial developmental and behavioral indices for the infective juveniles of entomopathogenic nematodes, which are used as biocontrol agents against a variety of agricultural pests. Ascarosides and isopropylstilbene (ISO) function as nematode pheromones with developmental and behavioral effects. In this study, 11 synthesized ascarosides identified from Caenorhabditis elegans, together with ISO identified from Photorhabdus luminescens, were used to determine their influence on the IJ recovery, growth on agar plates, and dispersal of S. carpocapsae All, H. bacteriophora H06 and H. indica LN2 nematodes. Compared with the controls, significant differences in IJ recovery of three nematode species were detected from the supernatants of their corresponding bacterial cultures with almost all ascarosides or isopropylstilbene (ISO) at 0.04 nM in 6 days. The highest IJ recovery percentages was obtained from ISO and ascr#3 for All strain, ascr#5 and ascr#6 for LN2 strain, and ISO and ascr#12 for H06 strain. The ISO detected from Photorhabdus bacteria also induced IJ recovery of S. carpocapsae All. IJ yields was significantly stimulated by all synthesized compounds for S. carpocapsae All, and by most compounds for H. bacteriophora H06. The higher IJ yields varied with ascarosides. Ascr#7 and DMSO was common for the improved IJ yields of both nematode species. The three nematode species showed marked differences in dispersal behavior. In response to the ascarosides or ISO, S. carpocapsae All IJs actively moved with different dispersal rates, H. indica LN2 IJs in very low dispersal rates, and H. bacteriophora H06 IJs in variable and even suppressed rates on the agar plates at least during the assay period. Based on the synthesized standards, ascr#1, ascr#9 and ascr#10 were detected from three nematode species, ascr#5 and ascr#11 also from S. carpocapsae All and H. bacteriophora H06, and ascr#12 also from H. bacteriophora H06 and H. indica LN2. Ascr#9 was most abundant in three nematode species. Compared with the sterile PBS, significantly more ascr#1, ascr#9 and ascr#10 were detected from S. carpocapsae All and H. indica LN2, but less ascr#5 and ascr#11 from S. carpocapsae All, ascr#1, ascr#5, ascr#11 and ascr#12 from H. bacteriophora H06, in the corresponding bacterial supernatant. It seems that the bacterial supernatants could regulate the ascaroside secretion by the three nematode species. These results will provide useful clues for selecting suitable ascarosides to induce the recovery, improve the yield, and enhance the dispersal of the IJs of these nematodes"
Keywords:		Agar Animals *Nematoda/physiology Pheromones *Photorhabdus Ascarosides Dispersal Entomopathogenic nematode Isopropylstilbene Recovery and growth;
Notes:		"MedlineWang, Jie Cao, Li Huang, Zhihua Gu, Xinghui Cui, Yonghe Li, Jiangzhou Li, Yuling Xu, Chengti Han, Richou eng Research Support, Non-U.S. Gov't 2022/01/16 J Invertebr Pathol. 2022 Feb; 188:107717. doi: 10.1016/j.jip.2022.107717. Epub 2022 Jan 11"