Abstract
Midguts from adult sterile male Ceratitis capitata Wiedemann and Anastrepha ludens Loew, the Mediterranean fruit fly and Mexican fruit fly, respectively, were examined microscopically to determine if radiation used in sterile insect technique (SIT) affected this non target tissue and/or the microorganisms associated with the midgut. Scanning and transmission electron microscopy were used to compare midgut tissues and microorganisms from irradiated and nonirradiated mass-reared adult flies. Observations for both fruit fly species were similar. Our comparisons revealed that newly emerged and two-day-old irradiated flies exhibited signs of damage to midgut tissue, cellular organelles, and gut microbiota not observed in nonirradiated flies of the same ages. Peritrophic membrane formation and bacterial growth appeared diminished in the midguts of irradiated flies compared to nonirradiated flies. Cellular damage of midgut tissue from irradiated flies included distorted, small nuclei that lacked nuclear material, and mitochondria that were dilated and/or vacuolated. No visual evidence of cellular damage was observed in nonirradiated flies. The impact of radiation used in SIT on fly competitiveness, referred to herein as the capability of adult flies to perform a function, is discussed, including the potential use of probiotic diets to improve damaged midgut tissue and restore midgut microbiota.
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Acknowledgments
We gratefully acknowledge Steve Peck, Brigham Young University, and Heidi Ketter, USDA Hilo, HI for providing C. capitata. We thank David Robacker, USDA, Weslaco, TX for providing A. ludens. We also thank Todd Shelly, USDA Waimanalo, HI for helpful editorial comments. This research was supported in part by a USDA NRI Competitive Grant 9902695.
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Communicated by C. Cutler.
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Lauzon, C.R., Potter, S.E. Description of the irradiated and nonirradiated midgut of Ceratitis capitata Wiedemann (Diptera: Tephritidae) and Anastrepha ludens Loew (Diptera: Tephritidae) used for sterile insect technique. J Pest Sci 85, 217–226 (2012). https://doi.org/10.1007/s10340-011-0410-1
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DOI: https://doi.org/10.1007/s10340-011-0410-1