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The effects of kochia, wheat and oats on digestive proteinases and the protein economy of adult grasshoppers, Melanoplus sanguinipes


, : The effects of kochia, wheat and oats on digestive proteinases and the protein economy of adult grasshoppers, Melanoplus sanguinipes. Journal of insect physiology7(6): 417-430

Adult male grasshoppers (Melanoplus sanguinipes), fed diets of wheat, oats, or kochia ad libitum varied in the amount of food consumed wheat > oats > kochia which paralleled weight gains but not the amount of frass produced. Approximate digestibility was significantly lower, and the efficiency of conversion of assimilated food was significantly higher on kochia than either of the cereals. Assays of proteolytic digestive enzymes on the three diets revealed that adults produced substantially more trypsin and chymotrypsin on oats and kochia than on wheat. Production of greater amounts of these enzymes occurred within seven days after introduction to oats or kochia. Electropherograms of haemolymph from grasshoppers fed oats or kochia had much less stainable protein compared to those fed wheat. All putative bands of vitellogenin from either haemolymph or fat body were substantially reduced on diets of oats or kochia. In the male reproductive system, the major accessory gland protein, long hyaline gland protein was significantly reduced in kochia-fed grasshoppers. Leaves of wheat had significantly more precipitable protein than oats, and oats had significantly more precipitable protein than kochia. Measurable protein in the three diets may not completely account for the disparities in vitellogenins and other haemolymph proteins. It is suggested that the overproduction of digestive proteolytic enzymes may have been a contributory factor in protein attrition, resulting in slower growth and reduced reproduction. These observations explain in part the consequences of these diets to the biotic potential of grasshoppers.

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Accession: 002249262

DOI: 10.1016/0022-1910(91)90051-z

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Related references

Hinks C.F.; Cheeseman M.T.; Erlandson M.A.; Olefert O.; Westcott N.D., 1991: The effects of kochia wheat and oats on digestive proteinases and the protein economy of adult grasshopper melanoplus sanguinipes. Adult male grasshoppers (Melanoplus sanguinipes), fed diets of wheat, oats, or kochia ad libitum varied in the amount of food consumed wheat > oats > kochia which paralleled weight gains but not the amount of frass produced. Approximate dige...

Hinks, C.F.; Erlandson, M.A., 1995: The accumulation of haemolymph proteins and activity of digestive proteinases of grasshoppers (Melanoplus sanguinipes) fed wheat, oats or kochia. Lesser migratory grasshoppers, Melanoplus sanguinipes (Fab.), were fed single plant diets of wheat, oats or kochia foliage in the instar preceding sampling, from the 2nd to 5th instars. Haemolymph proteins, tryptic and chymotryptic activity in the...

Hinks, C.; Hupka, D., 1995: The effects of feeding leaf sap from oats and wheat, with and without soybean trypsin inhibitor, on feeding behavior and digestive physiology of adult males of Melanoplus sanguinipes. Newly-fledged adult male grasshoppers (Melanoplus sanguinipes Fab.) were fed measured quantities of freshly prepared sap from the leaves of seedlings of wheat (Triticum aestivum L. cv. Katepwa) or oats (Avena sativa L. cv. Harmon), or sap from eac...

Hinks, CF.; Hupka, D., 1995: The effects of feeding leaf sap from oats and wheat, with and without soybean trypsin inhibitor, on feeding behaviour and digestive physiology of adult males of Melanoplus sanguinipes. Newly-fledged adult male grasshoppers (Melanoplus sanguinipes Fab.) were fed measured quantities of freshly prepared sap from the leaves of seedlings of wheat (Triticum aestivum L. cv. Katepwa) or oats (Avena saliva L. cv. Harmon), or sap from eac...

Hinks, C.F.; Hupka, D., 1995: The effects of feeding leap sap from oats and wheat, with and without soybean trypsin inhibitor, on feeding behaviour and digestive physiology of adult males of Melanoplus sanguinipes. Newly-fledged adult male grasshoppers (Melanoplus sanguinipes Fab.) were fed measured quantities of freshly prepared sap from the leaves of seedlings of wheat (Triticum aestivum L. cv. Katepwa) or oats (Avena saliva L. cv. Harmon), or sap from eac...

Hinks, C.F.; Olfert, O.; Westcott, N.D.; Coxworth, E.M.; Craig, W., 1990: Preference and performance in grasshopper, Melanoplus sanguinipes (Orthoptera: Acrididae), feeding on kochia, oats, and wheat: implications for population dynamics. Distribution in binary choice experiments using growing plants or cut leaves indicated that the grasshopper Melanoplus sanguinipes (F.) preferred wheat (Triticum aestivum (L.)) and kochia rather than oats (Avena sativa (L.)). Wheat was preferred m...

Nelson D.R.; Nunn N.J.; Jackson L., 1984: Reanalysis of the methylalkanes of the grasshoppers melanoplus differentialis melanoplus packardii and melanoplus sanguinipes. Gas chromatography-mass spectrometry was used to determine the structures of the methyl branched alkanes of the grasshoppers M. differentialis (Thomas), M. packardii (Scudder) and M. sanguinipes (Fabricius). The branched hydrocarbons were composed...

Olfert, O.; Erlandson, M.A., 1991: Wheat foliage consumption by grasshoppers (Orthoptera: Acrididae) infected with Melanoplus sanguinipes entomopoxvirus. First-instar grasshoppers infected with Melanoplus sanguinipes entomopoxvirus consumed 25% less food within 5 d (75 degree-days (DD), base 10 degrees C) after inoculation with 5 X 10(3) virus occlusion bodies. Grasshoppers ate 25 and 40% less food...

Smith, D.S., 1966: Fecundity and oviposition in the grasshoppers Melanoplus sanguinipes (F.) and Melanoplus bivittatus (Say). The following is virtually the author's abstract. In work in Alberta, pairs of Melanoplus sanguinipes (F.) and M. bivittatus (Say) were reared in cages, and the eggs produced by each female were counted. M. sanguinipes laid averages of 328.7...

Hardman J.M.; Mukerji M.K., 1982: A model simulating the population dynamics of the grasshoppers acrididae melanoplus sanguinipes melanoplus packardii and camnula pellucida. A modified Leslie matrix model was devised to simulate the effect of weather conditions on changes in the densities of nymphs and adults of 3 injurious grasshoppers, M. sanguinipes, M. packardii, and C. pellucida. In the model, egg development and...