Experimental studies in insect parasitism XI. The haemocytic reaction of a caterpillar under varied conditions
- 1 March 1960
- journal article
- research article
- Published by The Royal Society in Proceedings of the Royal Society of London. B. Biological Sciences
- Vol. 151 (945), 446-467
- https://doi.org/10.1098/rspb.1960.0009
Abstract
Eggs or young larvae of an ichneumonid parasite, Nemeritis, injected into caterpillars of the tomato moth, Diataraxia, evoked a rapid reaction of the haemocytes, which led to the encapsulation of the parasite within 4 h. The further development of the capsule is described, and evidence is adduced that the encapsulated parasites were killed by asphyxiation. Encapsulation was blocked by injection of carbon particles, but only when the doses were so large that they affected the general health of the hosts; it was temporarily less intense in superparasitized hosts; and it appeared to be slightly depressed by cortisone. Attempts to induce tolerance in the host by various methods-by repeated parasitization, by inoculation with an homogenate of parasite larvae, by inoculation with the blood of a susceptible host and by embryonic inoculation of substances from an homogenate of parasite larvae-all failed to protect the parasite, which was encapsulated as thickly and rapidly as in untreated caterpillars. When the parasite was given prior experience of Diataraxia blood by two different methods it acquired no immunity. The haemocytic reaction was similarly evoked by other species of parasites, by dead parasites, by glass rods and pieces of nylon thread, by injured tissues of the caterpillar itself, and by organs transplanted from caterpillars of another species. Organs transplanted from other caterpillars of the same species attracted haemocytes only to injured surfaces. Haemocytic capsules formed in one caterpillar of Diataraxia and transplanted to another caterpillar of the same species were accepted as intraspecific implants and aroused no reaction; capsules formed in another species and transplanted to Diataraxia evoked a strong haemocytic reaction in the second host. It is concluded that surface properties of the parasite or implant determine whether or not it shall be encapsulated.Keywords
This publication has 10 references indexed in Scilit:
- Insect Blood CellsAnnual Review of Entomology, 1959
- Effect of Antibiotics on the Phagocytic Activity of the Reticulo-Endothelial SystemNature, 1958
- Acquired tolerance of turkeys to Rous sarcoma agentProceedings of the Royal Society of London. B. Biological Sciences, 1956
- FACTORS AFFECTING RESISTANCE TO INFECTIONAnnual Review of Microbiology, 1956
- Experimental studies in insect parasitism - VIII. Host reactions following artificial parasitizationProceedings of the Royal Society of London. B. Biological Sciences, 1955
- The Selection and Rearing of Leaf-eating Insects for Use as Test Subjects in the Study of InsecticidesBulletin of Entomological Research, 1951
- Investigations on the problem of metamorphosis. IV. Developmental relations of interspecific organ transplants in DrosophilaJournal of Experimental Zoology, 1939
- Der Einfluss tierischer Parasiten auf den Organismus der InsektenZeitschrift Fur Parasitenkunde-Parasitology Research, 1936
- Die Unempfänglichkeit der Raupen von Loxostege sticticalis L. und Pieris brassicae L. gegen ParasitenZeitschrift Fur Parasitenkunde-Parasitology Research, 1933