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Sterol-modified plants reduce aphid performance by limiting sterol availability.

Ivy W Chen1, Jiaxin Lei2, Zekun Jin2

  • 1Department of Entomology, Texas A&M University, College Station, TX, 77843, United States of America; Department of Primary Industries, Queensland Government, Brisbane, Queensland, 4000, Australia.

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Summary

Engineering plants to alter sterol content reduces aphid growth and survival. Silencing the HYD1 gene in Arabidopsis thaliana limits essential sterols, impacting the performance of the aphid Myzus persicae.

Keywords:
Arabidopsis thalianaCholesterolElectropenetrographyInsect-plant interactionsMyzus persicaePhytosterolRNA-seq

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Area of Science:

  • Plant-insect interactions
  • Molecular biology
  • Agricultural science

Background:

  • Sterols are vital for eukaryotic cells, but insects must obtain them from their diet.
  • Plant-derived sterols are usually converted to cholesterol for insect development.
  • Previous work engineered Arabidopsis thaliana with silenced HYD1, altering sterol composition.

Purpose of the Study:

  • To assess the impact of HYD1-silenced Arabidopsis on the phloem-feeding aphid Myzus persicae.
  • To investigate aphid performance, feeding behavior, and sterol accumulation on modified plants.
  • To explore the underlying molecular mechanisms in plants and aphids.

Main Methods:

  • Evaluating aphid growth, reproduction, and survival on HYD1 RNAi lines versus wild-type.
  • Conducting host choice assays and electropenetrography (EPG) to study feeding behavior.
  • Analyzing sterol profiles in aphids and phloem sap using chromatography.
  • Performing RNA-sequencing (RNA-seq) on HYD1 RNAi plants to examine gene expression.

Main Results:

  • Aphids on HYD1 RNAi lines showed significantly reduced growth, reproduction, and survival.
  • No differences in host preference or feeding behavior were observed between plant lines.
  • Myzus persicae did not accumulate atypical sterols; total sterol content was reduced.
  • Phloem sap sterol profiles reflected the reduced sterol content of the modified plants.
  • RNA-seq revealed no activation of plant defense pathways, but upregulation of translation and nitrate metabolism genes.

Conclusions:

  • HYD1 silencing in plants reduces host suitability for aphids by limiting sterol availability.
  • This sterol modification strategy shows potential for managing phloem sap-feeding insect pests.
  • Altering plant sterol metabolism offers a novel approach for crop protection.