The relative abundance of hemocyte types in a polyphagous moth larva depends on diet |
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| Institution: | 1. Johannes Gutenberg-Universität Mainz, Institut für Zoologie, Abt. Evolutionsbiologie, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany;2. Université Bourgogne-Franche Comté, Équipe Écologie Évolutive, UMR 6282 Biogéosciences, 6 Bd Gabriel, F-21000 Dijon, France;3. Centre d’Etudes Biologiques de Chizé, UMR 7372, CNRS – Université de la Rochelle, 79360 Beauvoir-sur-Niort, France;4. INRA, UMR 1065 Save ISVV, B.P.81, F-33883 Villenave d’Ornon Cedex, France;5. Université de Bordeaux, Bordeaux Sciences Agro, INRA, UMR 1065 Save ISVV, B.P.81, F-33883 Villenave d’Ornon Cedex, France;1. The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland;2. Research Center for Structural Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;3. Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan;4. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland;3. Institute of Physics, Opole University of Technology, 75, Ozimska str., 45370 Opole, Poland;4. Vlokh Institute of Physical Optics, 23, Dragomanov str., 79005 Lviv, Ukraine;5. Institute of Physics, Jan Dlugosz University, 13/15, Armii Krajowej al., 42200 Czestochowa, Poland |
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| Abstract: | Hemocytes are crucial cells of the insect immune system because of their involvement in multiple immune responses including coagulation, phagocytosis and encapsulation. There are various types of hemocytes, each having a particular role in immunity, such that variation in their relative abundance affects the outcome of the immune response. This study aims to characterize these various types of hemocytes in larvae of the grapevine pest insect Eupoecilia ambiguella, and to assess variation in their concentration as a function of larval diet and immune challenge. Four types of hemocytes were found in the hemolymph of 5th instar larvae: granulocytes, oenocytoids, plasmatocytes and spherulocytes. We found that the total concentration of hemocytes and the concentration of each hemocyte type varied among diets and in response to the immune challenge. Irrespective of the diet, the concentration of granulocytes increased following a bacterial immune challenge, while the concentration of plasmatocytes and spherulocytes differentially varied between larval diets. The concentration of oenocytoids did not vary among diets before the immune challenge but varied between larval diets in response to the challenge. These results suggest that the resistance of insect larvae to different natural enemies critically depends on the effect of larval diet on the larvae’s investment into the different types of hemocytes. |
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| Keywords: | Ecological immunity Grape varieties Hemocyte differentiation Lepidoptera Tortricidae |
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