Altered Carbohydrate Levels and Gluconeogenic Enzyme Activity in Trichoplusia ni Parasitized by the Insect Parasite, Hyposoter exiguae

1984 ◽  
Vol 70 (5) ◽  
pp. 644 ◽  
Author(s):  
Stewart N. Thompson ◽  
Bradley F. Binder
Keyword(s):  
Enzyme Activity ◽  
Trichoplusia Ni ◽  
Insect Parasite ◽  
Gluconeogenic Enzyme ◽  
Carbohydrate Levels

Effects of parasitization by the insect parasite Hyposoter exiguae on the growth, development and physiology of its host Trichoplusia ni

Parasitology ◽  
1982 ◽  
Vol 84 (3) ◽  
pp. 491-510 ◽  
Author(s):  
S. N. Thompson
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Growth And Development ◽  
Trichoplusia Ni ◽  
Fat Body ◽  
Weight Ratio ◽  
Juvenile Hormone Esterase ◽  
Insect Parasite ◽  
Wet Weight ◽  
Growth Development

SummaryThe weight gain and growth rate of Trichoplusia ni larvae were severely depressed following parasitization by the insect parasite, Hyposoter exiguae. The development of the host was also delayed and juvenile hormone esterase activity present at the normal time of moulting was absent in parasitized insects. Similar effects on growth and development were achieved by rearing host insects on nutrient-deficient media. Accompanying the above effects of parasitization were alterations in dry/wet weight ratio and host haemolymph osmolality. Parasitization resulted in immediate increases in the concentrations of haemolymph non-glycogen carbohydrate (composed of trehalose, maltose and glucose) and protein. The concentration of fat body glycogen also increased following parasitization. In contrast, the concentration of haemolymph non-glycogen carbohydrate and protein, as well as fat body glycogen, decreased in nutrient-deprived larvae. The significance of the above results as they relate to the insect parasite–host relationship is discussed.

The nutritional physiology of Trichoplusia ni parasitized by the insect parasite, Hyposoter exiguae, and the effects of parallel-feeding

Parasitology ◽  
1983 ◽  
Vol 87 (1) ◽  
pp. 15-28 ◽  
Author(s):  
S. N. Thompson
Keyword(s):  
Food Consumption ◽  
Dietary Protein ◽  
Trichoplusia Ni ◽  
Growth Depression ◽  
Insect Parasite ◽  
Protein Levels ◽  
Nutritional Physiology ◽  
Host Nutrition ◽  
Ad Libitum ◽  
Rates Of Growth

SUMMARYHost nutrition plays a major role in the nutritional physiology of Trichoplusia ni parasitized by the hymenopterous insect parasite, Hyposoter exiguae. Severely reduced growth rate characterized the host association throughout the 4th developmental stadium. This effect of parasitization, however, was indirect and growth depression of parasitized larvae was entirely accounted for by the accompanying decreased rate of food consumption. Parallel-fed larvae, that is, unparasitized larvae feeding on nutrients at the same rate as observed in ad libitum-fed parasitized individuals, displayed lower rates of growth than parasitized larvae and the latter had higher rates of assimilation. Parasitization, therefore, directly resulted in an increased rate of assimilation over that observed in uninfected insects after accounting for the effects of altered food consumption. Similarly, differences in the pattern of response to decreased dietary protein levels between parasitized and unparasitized insects could be explained on the basis of differences in their rates of food consumption

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