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Heat-shock protein 70-a hub gene-underwent adaptive evolution involved in whitefly-wild tomato interaction.

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BACKGROUND The whitefly Bemisia tabaci, causes severe damage to cultivated tomato plants, but actively avoids the wild tomato Solanum habrochaites. Moreover, the mortality of whitefly increases significantly after feeding with… Click to show full abstract

BACKGROUND The whitefly Bemisia tabaci, causes severe damage to cultivated tomato plants, but actively avoids the wild tomato Solanum habrochaites. Moreover, the mortality of whitefly increases significantly after feeding with the wild tomato. However, additional experiments are warranted to more carefully elucidate the specific molecular elements underlying the interaction between whitefly and wild tomato. RESULTS Our results showed that S. habrochaites significantly increases the mortality of whitefly adults and decreases both their fertility and fecundity. In addition, the expression of stress-response genes in whitefly after exposure to S. habrochaites was analyzed using RNA sequencing. Weighted gene co-expression network analysis was conducted to identify the hub genes to determine their potential associations with the mortality of whitefly. These results suggested that the expression of heat-shock protein (HSP), multicopper oxidase, and OHCU decarboxylase genes were induced in whitefly. To validate the gene associations with whitefly mortality, a high-throughput in vivo model system and RNAi-based gene silencing were used. The results revealed that the RNAi-mediated depletion of HSP gene, which belongs to the HSP70 subfamily, increased the mortality of whitefly, suggesting this chaperone has an evolutionarily conserved function in insects. Further, the selection pressure analysis showed that a total of five amino acid sites of positive selection were identified, three of which were located in the nucleotide-binding domain and the other two in the substrate-binding domain. CONCLUSIONS This is the first report on the involvement of HSPs in insect-plant interactions. This study could more precisely identify the molecular mechanisms of whitefly in response to wild tomatoes. This article is protected by copyright. All rights reserved.

Keywords: gene; wild tomato; mortality whitefly

Journal Title: Pest management science
Year Published: 2022

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