Abiotic and biotic stressors causing equivalent mortality induce highly variable transcriptional responses in the soybean aphid.
Bottom Line: Molecular responses showed little overlap across all three stressors.Exposure to host plant defenses elicited the weakest response, of which half of the genes were of unknown function.This study highlights the need for standardizing stress levels when comparing across stress types and provides a basis for understanding the role of general vs. stressor specific molecular responses in aphids.
Affiliation: Department of Entomology, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0816.Show MeSH
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Mentions: Overall, transcriptional stress responses were highly variable despite all three stressors, causing an equivalent decrease in adult mortality. The total number of DE genes relative to control conditions differed by several orders of magnitude across the three stress types (Figure 2). Starvation had the strongest effect on gene expression (3985 DE genes), heat stress had an intermediate effect (510 DE genes), and plant defensive stress induced changes in only a handful of genes (12 DE genes). Consequently, there was only one stress responsive gene common to all stressors, a down-regulated 5′ nucleotidase (Figure 2).
Affiliation: Department of Entomology, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0816.