High-throughput molecular gut content analysis of aphids identifies plants relevant for potato virus Y epidemiology

Abstract

Aphids are phloem-feeding insects that reduce crop productivity due to feeding and transmission of plant viruses. When aphids disperse across the landscape to colonize new host plants, they will often probe on a wide variety of nonhost plants before settling on a host suitable for feeding and reproduction. There is limited understanding of the diversity of plants that aphids probe on within a landscape, and characterizing this diversity can help us better understand host use patterns of aphids. Here, we used gut content analysis (GCA) to identify plant genera that were probed by aphid vectors of potato virus Y (PVY). Aphids were trapped weekly near potato fields during the growing seasons of 2020 and 2021 in San Luis Valley in Colorado. High-throughput sequencing of plant barcoding genes, trnF and ITS2, from 200 individual alate (i.e., winged) aphids representing nine vector species of PVY was performed using the PacBio sequencing platform, and sequences were identified to genus using NCBI BLASTn. We found that 34.7&percnt, of aphids probed upon presumed PVY host plants and that two of the most frequently detected plant genera,Solanum and Brassica, represent important crops and weeds within the study region. We found that 75&percnt, of aphids frequently probed upon PVY nonhosts including many species that are outside of their reported host ranges. Additionally, 19&percnt, of aphids probed upon more than one plant species. This study provides the first evidence from high-throughput molecular GCA of aphids and reveals host use patterns that are relevant for PVY epidemiology.

Keywords

aphids / epidemiology / gut content analysis / insect ecology / plant–insect interactions / plant disease

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2024 The Authors. Insect Science published by John Wiley & Sons Australia, Ltd on behalf of Institute of Zoology, Chinese Academy of Sciences.