Penicillium fungi mediate behavioral responses of the yellow peach moth, Conogethes punctiferalis (Guenée) to apple fruits via altering the emissions of host plant VOCs

• Published in: Archives of insect biochemistry and physiology Vol. 110; no. 3; pp. e21895 - n/a
• Main Authors: Guo, Hong‐Gang, Han, Chun‐Yu, Zhang, Ai‐Huan, Yang, Ai‐Zhen, Qin, Xiao‐Chun, Zhang, Min‐Zhao, Du, Yan‐Li
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01.07.2022
• Subjects: Apples; Butterflies & moths; Conogethes punctiferalis; Conogethes punctiferalis (Guenée); Culture media; Dextrose; Emissions; Ethyl hexanoate; Farnesene; Females; Formulations; Fruits; Fungi; fungi‐infected apples; Herbivores; Host plants; Host selection; Insects; Microorganisms; Organic compounds; Oviposition; Penicillium; Penicillium fungi; Potatoes; the selection behavior of YPMs; VOCs; Volatile organic compounds; fungi-infected apples; Conogethes punctiferalis (Guenée); Penicillium fungi; the selection behavior of YPMs
• ISSN: 0739-4462; 1520-6327
• DOI: 10.1002/arch.21895

Plant‐associated microbes have been reported as important but overlooked drivers of plant–herbivorous insect interactions. Influence of plant‐associated microbes on plant–insect interactions is diverse, including beneficial, detrimental, and neutral. Here, we determined the effects of three Penicillium fungi, including Penicillium citrinum, Penicillium sumatrense, and Penicillium digitatum, on the oviposition selection and behavior of the yellow peach moth (YPM), Conogethes punctiferalis (Guenée). Compared with fungi noninfected apples (NIA), mechanically damaged apples (MDA), and P. citrinum in potato dextrose agar medium (PC), the oviposition selection and four‐arm olfactometer experiments both showed that mated YPM females preferred to P. citrinum‐infected apples (PCA). For P. sumatrense or P. digitatum, we also found that mated YPM females preferred to P. sumatrense‐infected apples (PSA) or P. digitatum‐infected apples (PDA), respectively. Among three Penicillium fungi‐infected apples, the selection rates including oviposition and olfactometer behavior of mated YPM females on PDA were both higher than those on PSA and PCA. Further analyses of host plant volatile organic compounds (VOCs) by GC‐MS showed that the absolute contents of ethyl hexanoate and (Z, E)‐α‐farnesene in PCA, PSA, and PDA were all higher than those in NIA, and a total of 16 novel VOCs were detected in fungi‐infected apples (PCA, PSA, and PDA), indicating that fungi infection changed the components and proportions of apple VOCs. Taken together, three Penicillium fungi play significant roles in mediating the host selection of YPMs via altering the emissions of VOCs. These findings will be beneficial for developing formulations for field trapping of YPMs in the future. Compared with Penicillium fungi noninfected apples (NIA), mechanically damaged apples (MDA), and Penicillium in PDA medium, the yellow peach moth (YPM) preferred to Penicillium fungi‐infected apples. Further analyses of volatile organic compounds (VOCs) showed that the absolute contents of ethyl hexanoate and (Z, E)‐α‐farnesene in Penicillium fungi‐infected apples were higher than those in NIA, and 16 novel VOCs were detected in Penicillium fungi‐infected apples. Taken together, Penicillium fungi could alter the host plant VOCs, and consequently affect the oviposition and foraging behavior of YPMs.