Skip to main content
Log in

Early plant defence against insect attack: involvement of reactive oxygen species in plant responses to insect egg deposition

  • Original Article
  • Published:
Planta Aims and scope Submit manuscript

Abstract

Main conclusion

Pinus sylvestris responds to insect egg deposition by ROS accumulation linked with reduced activity of the ROS scavenger catalase. Egg mortality in needles with hypersensitive response (HR)-like symptoms is enhanced.

Aggressive reactive oxygen species (ROS) play an important role in plant defence against biotic stressors, including herbivorous insects. Plants may even generate ROS in response to insect eggs, thus effectively fighting against future larval herbivory. However, so far nothing is known on how ROS-mediated plant defence against insect eggs is enzymatically regulated. Neither do we know how insects cope with egg-induced plant ROS. We addressed these gaps of knowledge by studying the activities of ROS-related enzymes in Pinus sylvestris deposited with eggs of the herbivorous sawfly Diprion pini. This species cuts a slit into pine needles and inserts its eggs into the needle tissue. About a quarter of egg-deposited needles show chlorotic tissue at the oviposition sites, indicating hypersensitive response-like direct defence responses resulting in reduced larval hatching from eggs. Hydrogen peroxide and peroxidase sensitive staining of sections of egg-deposited pine needles revealed the presence of hydrogen peroxide and peroxidase activity in needle tissue close to the eggs. Activity of ROS-producing NADPH-oxidase did not increase after egg deposition. However, the activity of the ROS-detoxifying enzyme catalase decreased after egg deposition and ovipositional wounding of needles. These results show that local ROS accumulation at the oviposition site is not caused by increased NADPH-oxidase activity, but reduced activity of pine needle catalase may contribute to it. However, our data suggest that pine sawflies can counteract the egg deposition-induced hydrogen peroxide accumulation in pine needles by high catalase activity in their oviduct secretion which is released with the eggs into pine tissue.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4

Similar content being viewed by others

Abbreviations

APX:

Ascorbate peroxidase

CAT:

Catalase

HR:

Hypersensitive response

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

References

Download references

Acknowledgements

We thank the technicians Ute Braun and Gabriele Haberberger, Institute of Biology, Freie Universität Berlin, for rearing and maintaining the sawfly population, and the students Juliane Dankwarth and Marlena Winter for dissecting sawflies and supporting the enzymatic assays. We also thank Prof. Dr. Christian Schmitz-Linneweber and Arne Hillebrand, Humboldt Universität Berlin, for technical support with ultracentrifugation and Prof. Dr. Margarete Baier, Freie Universität Berlin, for her advice in enzyme activity analysis. Furthermore, we thank two anonymous reviewers for their helpful comments.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Monika Hilker.

Ethics declarations

All animals in this study were treated according to legal guidelines of the European Union and the Federal Republic of Germany as well as according to institutional guidelines of Freie Universität Berlin.

Conflict of interest

The authors declare they have no conflict of interest and consented in submitting and publishing this study.

Funding

This study was funded by the German Research Foundation (DFG Hi 416/22-1).

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Bittner, N., Trauer-Kizilelma, U. & Hilker, M. Early plant defence against insect attack: involvement of reactive oxygen species in plant responses to insect egg deposition. Planta 245, 993–1007 (2017). https://doi.org/10.1007/s00425-017-2654-3

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00425-017-2654-3

Keywords

Navigation