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Neotropical Entomology

, Volume 46, Issue 3, pp 256–263 | Cite as

Gamma irradiation on canola seeds affects herbivore-plant and host-parasitoid interactions

  • M Akandeh
  • M SoufbafEmail author
  • F Kocheili
  • A Rasekh
Ecology, Behavior and Bionomics

Abstract

As an agricultural modernization, gamma irradiation is an important method for enhancing crop yield and quality. Nevertheless, its use can alter other plant traits such as nutrition and resistance to different biotic/abiotic stresses that consequently affect plant–insect interactions. A tritrophic system was utilized based on two canola mutant lines produced through gamma irradiation (RGS 8–1 and Talaye 8–3). Plutella xylostella (L.), as a worldwide pest of Brassicaceae and Cotesia vestalis (Holiday) as a key biocontrol agent of P. xylostella were examined for the potential indirect effects of canola seed irradiation on the experimental insects’ performance when acting on the respective mutant lines. This study showed that physical mutation did not affect plant nitrogen and herbivore-damaged total phenolics; however, phenolic compounds showed greater concentration in damaged leaves than undamaged leaves of both mutant and control plants. The relative growth rate and pupal weight of P. xylostella reared on RGS 8–1 were significantly higher than those reared on the control RGS. There was no significant difference by performance parameters of the parasitoid, C. vestalis, including total pre-oviposition period, adult longevity, adult fresh body weight of males and females, pupal weight, forewing area, and total longevity of both sexes on tested canola cultivars in comparison with their mutant lines. Life table parameters of C. vestalis on mutant lines of both cultivars, RGS and Talaye, were not significantly different from their control treatments. Comprehensive studies should be conducted to find out the mechanisms under which gamma rays affect plant–insect interactions.

Keywords

Diamondback moth Insect fitness Host plant resistance Physical mutation Total phenolics Tritrophic interactions 

Notes

Acknowledgments

This research is a part of Ph.D. dissertation of M.A. that was funded by Shahid Chamran University. We wish to thank Kamran Mozafari for providing us with mutant canola genotypes.

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Copyright information

© Sociedade Entomológica do Brasil 2016

Authors and Affiliations

  1. 1.Dept of Entomology, Faculty of AgricultureShahid Chamran Univ of AhvazAhvazIran
  2. 2.Agricultural, Medical and Industrial Research SchoolKarajIran

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