Critical PO 2 as a diagnostic biomarker for the effects of low-oxygen modified and controlled atmospheres on phytosanitary irradiation treatments in the cabbage looper Trichoplusia ni (Hübner).

Autor: Chen C; Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA., Condon CH; Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA., Boardman L; Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA., Meagher RL; USDA-ARS, Center for Medical, Agricultural, and Veterinary Entomology, Gainesville, FL, USA., Jeffers LA; USDA-APHIS-PPQ Center for Plant Health Science and Technology, Raleigh, NC, USA., Beam A; USDA-APHIS-PPQ Center for Plant Health Science and Technology, Miami, FL, USA., Bailey WD; USDA-APHIS-PPQ Center for Plant Health Science and Technology, Miami, FL, USA., Hahn DA; Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA.
Jazyk: angličtina
Zdroj: Pest management science [Pest Manag Sci] 2020 Jul; Vol. 76 (7), pp. 2333-2341. Date of Electronic Publication: 2020 Feb 12.
DOI: 10.1002/ps.5768
Abstrakt: Background: Phytosanitary irradiation is a sustainable alternative to chemical fumigants for disinfesting fresh commodities from insect pests. However, irradiating insects in modified atmospheres with very low oxygen (<1 kPa O 2 ) has repeatedly been shown to increase radioprotective response. Thus, there is a concern that modified atmosphere packaging could reduce the efficacy of phytosanitary irradiation. One hurdle slowing the widespread application of phytosanitary irradiation is a lack of knowledge about how moderate levels of hypoxia relevant to the modified atmosphere packaging of most fresh commodities (3-10 kPa O 2 ) may affect phytosanitary irradiation treatments. Therefore, we hypothesize that critical PO 2 (P crit ), the level of oxygen at which an insect's metabolism becomes impaired, can be used as a diagnostic biomarker to predict the induction of a radioprotective response.
Results: Using the cabbage looper Trichoplusia ni (Hübner), we show that there is a substantial increase in radiation resistance when larvae are irradiated in atmospheres more hypoxic than their P crit (3.3 kPa O 2 ). These data are consistent with our hypothesis that P crit could be used as a diagnostic biomarker for what levels of hypoxia may induce radioprotective effects that could impact phytosanitary irradiation treatments.
Conclusion: We propose that the relationship between P crit and radioprotective effects could allow us to build a framework for predicting the effects of low-oxygen atmospheres on the efficacy of phytosanitary irradiation. However, more widespread studies across pest species are still needed to test the generality of this idea.
(© 2020 Society of Chemical Industry.)
Databáze: MEDLINE
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