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Maize Stem Response to Long-Term Attack by Sesamia nonagrioides.

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Maize plants activate long-term defenses against corn borers by altering metabolism and redox responses, producing toxins to reduce insect viability. Caterpillar secretions had minimal impact on these sustained plant defenses.

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Area of Science:

  • Plant biology
  • Entomology
  • Biochemistry

Background:

  • Plants employ diverse genetic and biochemical strategies to defend against herbivores, reducing damage and improving insect survival.
  • While short-term plant responses to insect attack are understood, long-term defense maintenance remains less clear.

Purpose of the Study:

  • To identify genes and metabolites involved in the long-term defense response of maize to the corn borer, *Sesamia nonagrioides*.
  • To evaluate the role of caterpillar secretions in eliciting long-term plant defense.

Main Methods:

  • Transcriptomic and metabolomic analyses were conducted on maize plants under attack.
  • Maize stem responses to insect regurgitates were assessed.

Main Results:

  • Long-term maize defense involves primary metabolism repression and a strong redox response, mediated by germin-like proteins.
  • Anti-nutritive and toxic compounds are produced, reducing insect viability, with the glutathione-ascorbate cycle mitigating reactive oxygen species (ROS) damage.
  • Caterpillar regurgitates showed a marginal effect on the long-term defensive response.

Conclusions:

  • Maize exhibits distinct defense mechanisms for long-term insect attack compared to early responses.
  • The study highlights the importance of redox balance and specific metabolic shifts in sustained plant defense.