Abstract
The potato tuberworm, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), is an important field and storage pest of potato Solanum tuberosum L. Feeding indices and midgut digestive protease and amylase enzyme activities were measured under laboratory conditions in P. operculella larvae reared on leaves of eight potato genotypes including Agria, Ausonia, Khavaran, Kondor, Morene, Satina, Savalan, Sprint, and two Iranian potato selections PI396124 and PI397082–2. The highest amounts efficiency of conversion of ingested food, and efficiency of conversion of digested food, were recorded in larvae reared on Savalan, and the lowest amount of these indices found on Khavaran, Agria, and PI397082–2. There were significant positive correlations between coefficients of P. operculella with midgut protease enzyme activity, and no significant correlations between the indices and midgut amylase enzyme activity. Among tested potato genotypes, the highest proteolytic activity was found on Savalan (6.6 ± 0.07 U/mg), and the lowest activity observed on Khavaran (4.4 ± 0.09 Umg −1) and Agria (4.4 ± 0.14 Umg −1).
Resumen
La palomilla de la papa, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), es una plaga importante de la papa Solanum tuberosum L. en el campo y en el almacén. Se midieron los índices de alimentación y las actividades de las enzimas digestivas proteasa y amilasa del intestino medio bajo condiciones de laboratorio en larvas de P. operculella criadas en hojas de ocho genotipos de papa incluyendo Agria, Ausonia, Khavaran, Kondor, Morene, Satina, Savalan, Sprint, y dos selecciones de papa Iraní, PI396124 y PI397082–2. Las cantidades más altas de eficiencia en la conversión de alimento ingerido, y la eficiencia de conversión de alimento digerido, se contabilizaron en larvas mantenidas en Savalan, y la cantidad más baja de estos índices se encontraron en Khavaran, Agria, y PI397082–2. Hubo correlaciones significativas positivas entre los coeficientes de P. operculella con actividad enzimática de la proteasa del intestino medio, y correlaciones sin significancia entre los índices y la actividad enzimática de la amilasa en el intestino medio. Entre los genotipos de papa probados, la más alta actividad proteolítica se encontró en Savalan (6.6 ± 0.07 U/mg), y la más baja se observó en Khavaran (4.4 ± 0.09 Umg −1) y Agria (4.4 ± 0.14 Umg −1).
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Acknowledgments
We thank the Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran. We also thank Drs. Bahram Naseri, Department of Plant Protection, Faculty of Agriculture, University of Mohaghegh Ardabil, Ardabil, Iran, and Tiziana Oppedisano, Oregon State University Crop and Soil Sciences Hermiston Agricultural Research and Extension Center, for the revision of this manuscript.
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Mansouri, S.M., Rondon, S.I. Physiological Responses of the Potato Tuberworm (Phthorimaea operculella) to Potato (Solanum tuberosum) Germplasm. Am. J. Potato Res. 98, 210–217 (2021). https://doi.org/10.1007/s12230-021-09834-3
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DOI: https://doi.org/10.1007/s12230-021-09834-3