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Related Experiment Video

Updated: Feb 4, 2026

Agrobacterium-Mediated Immature Embryo Transformation of Recalcitrant Maize Inbred Lines Using Morphogenic Genes
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Maize Hybrids Exhibit Reduction in an Elicitor-Triggered Defense Response Compared with Their Inbred Parents.

Asher I Hudson1, Maggie R Wagner2, Peter J Balint-Kurti1,3

  • 1Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, U.S.A.

Molecular Plant-Microbe Interactions : MPMI
|February 2, 2026
PubMed
Summary

Maize hybrids show reduced production of reactive oxygen species (ROS), a key part of plant immunity, compared to their parent lines. This finding suggests that plant immunity responses, like pattern-triggered immunity (PTI), may be a factor in the phenomenon of heterosis.

Keywords:
heterosismaizeplant immunityreactive oxygen species

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Area of Science:

  • Plant biology
  • Genetics
  • Immunology

Background:

  • Heterosis, or hybrid vigor, describes the enhanced performance of hybrids over their inbred parents.
  • A common trade-off exists between plant growth and defense mechanisms, where robust immunity can impede development and yield.
  • Host-microbe interactions are increasingly recognized as potential mediators of heterosis for growth and yield.

Purpose of the Study:

  • To investigate heterosis in the context of plant immunity, specifically focusing on reactive oxygen species (ROS) production.
  • To determine if pattern-triggered immunity (PTI), an early plant defense response, exhibits heterosis in maize hybrids.
  • To explore the relationship between ROS production in PTI and the phenomenon of heterosis.

Main Methods:

  • Maize hybrids and their inbred parental lines were treated with microbial elicitors to stimulate pattern-triggered immunity (PTI).
  • Reactive oxygen species (ROS) production was measured as an indicator of PTI activation.
  • Experiments accounted for genotypic differences, specific elicitors used, and the time of day to assess ROS production.

Main Results:

  • Reactive oxygen species (ROS) production following elicitor treatment was generally lower in maize hybrids compared to their inbred parents.
  • The observed differences in ROS production between hybrids and inbreds were significantly influenced by the specific genotypes involved.
  • The type of microbial elicitor and the time of day also played a role in modulating ROS production, indicating complex regulation.

Conclusions:

  • Pattern-triggered immunity (PTI), as measured by ROS production, demonstrates heterosis in maize.
  • Reduced PTI response in hybrids may be a contributing factor to heterosis observed in other traits like growth and yield.
  • Understanding the regulation of PTI and ROS production in hybrids offers insights into the genetic basis of heterosis.