IMPACT OF IMMUNE RESPONSE OF A PARASITIC BEETLE Dastarcus helophoroides ON ITS HOST BEETLE Monochamus alternatus.
Dastarcus helophoroides is an ectoparasitoid beetle of Monochamus alternatus, and the parasitism by D. helophoroides larvae remarkably influenced on the immune responses of M. alternatus larvae in many aspects. The hemolymph melanization reactions in the hosts were inhibited 1 h and 24 h postparasitization. The phenoloxidase activities of hemolymph were significantly stimulated 4 h postparasitization and inhibited 12 h postparasitization, and back to control level. The antibacterial activities of hemolymph in the parasitized hosts were significantly lower than that in the unparasitized ones 1 h postparasitization. By 72 h postparasitism, the total hemocyte numbers of the parasitized larvae declined to not more than one-seconds of the number collected from the unparasitized larvae. All sampled hemolymph held the capability of nodulation, and there were fluctuations in the number of nodules the hemocytes made. However, there were no significant differences between unparasitized and parasitized larvae at each time point in the hemagglutination activity and the ratios of spreading hemocytes. In conclusion, D. helophoroides larvae could regulate M. alternatus immune system and resulted in the changes in host immune responses.
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Xiao-Juan
XJ
Li
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Guang-Ping
GP
Dong
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Jian-Min
JM
Fang
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Hong-Jian
HJ
Liu
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Li
L
Yang
Institute of Forest Protection, Anhui Provincial Academy of Forestry, Hefei, People's Republic of China.
Wan-Lin
WL
Guo
D000818:Animals; D001517:Coleoptera / Q000201:enzymology / Q000276:immunology* / Q000469:parasitology*; D006384:Hemagglutination; D006434:Hemocytes / Q000276:immunology; D006458:Hemolymph / Q000201:enzymology* / Q000276:immunology; D006790:Host-Parasite Interactions; D007814:Larva / Q000201:enzymology / Q000276:immunology / Q000469:parasitology
Dastarcus helophoroides; Monochamus alternatus; immune response