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Enzymatic differences in the digestive system of the adult and larva of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae)

Journal of Stored Products Research 35(2): 167-174

Enzymatic differences in the digestive system of the adult and larva of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae)

Prostephanus truncatus (Horn) is a pest of stored maize that has caused major problems since appearing in Africa in the 1970s, although it is regarded as a minor pest in Mexico and Central America. The study of the digestive system of P. truncatus adults and larvae from Mexico, Togo and Tanzania is the subject of the present work. Adults and larval guts have two pH values of 6.2 in the midgut and fore-hindgut (ileum) and 4.2-4.6 in the mid-, and hind-hindgut. In these two pH regions and for the two stages, the passage time of the food bolus was different, being faster in the larval stage, mainly in the 6.2 pH portion. The enzymatic study shows higher amylolytic and proteolytic activity in the adult stage. In the three insect colonies studied and both adult and larval guts, the same isoenzyme pattern of amylolytic activity in electrophoretic zymograms was found, although, the slowest band was present in smaller quantities in the larvae instars. In the case of the proteolytic activity, the isoenzyme pattern showed differences among the three insect colonies studied but no differences between stages were found. These results suggest that the two insect colonies from Africa have different geographic origins.

Accession: 003127012

DOI: 10.1016/s0022-474x(98)00042-3

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Related references

Vazquez Arista, M.; Smith, R.M.; Olalde Portugal, V.; Hinojosa, R.E.; Hernandez Delgadillo, R.; Blanco Labra, A., 1997: Cellulolytic bacteria in the digestive system of Prostephanus truncatus (Coleoptera: Bostrichidae). Bacteria from the digestive system of larvae and adults of the larger grain borer, Prostephanus truncatus (Horn), from Mexico, Tanzania, and Togo were isolated and identified. Alcaligenes faecalis (Castellani & Chalmers), Chromobacterium violaceum...

Shires, SW., 1979: Influence of temperature and humidity on survival, development period and adult sex ratio in Prostephanus truncatus (Horn) (Coleoptera, Bostrichidae). Prostephanus truncatus (Horn) is an established pest of maize before harvest and during storage in Central America, but has been only rarely recorded elsewhere. In laboratory tests in the UK, with finely-ground American maize provided as larval di...

International Institute of Entomology., 1995: Prostephanus truncatus (Horn). Coleoptera: Bostrichidae. International Institute of Entomology Distribution Maps of Pests Series A Agricultural. December; 4651st revision): 1-3

Guntrip, J.; Sibly, R.M.; Smith, R.H., 1996: A phenotypic and genetic comparison of egg to adult life-history traits between and within two strains of the larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae). Using a transplantation technique, a phenotypic comparison of egg to adult life-history rates between Costa Rican and Togo strains of the Larger Grain Borer, Prostephanus truncatus, revealed differences in egg weight, development period and body w...

Golob, P.; Changjaroen, P.; Ahmed, A.; Cox, J., 1985: Susceptibility of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) to insecticides. Prostephanus truncatus adults were treated in the laboratory with permethrin (25:75), deltamethrin, (1R)-phenothrin (20:80), lindane, pirimiphos-methyl, malathion, fenvalerate and chlorpyrifos-methyl, by topical application, by exposure to treated...

Silva, A.A.L. da; D.A.tonino Faroni, L.R., 1994: Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae): a new threat to stored cereals. Notes are given on the biology, damage caused and control methods for Prostephanus truncatus, a pest of stored cereals.

Hodges, RJ.; Dunstan, WR.; Magazani, I.; Golob, P., 1983: An outbreak of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) in east Africa. P. truncatus, best known as a pest in Central America, was recorded for the 1st time in Africa. A survey revealed that it is present in farm storage over much of the Tabora region of Tanzania and has spread to certain other areas within that count...

Subramanyam, B.; Harein, PK.; Cutkomp, LK.; Pegors, C., 1988: Feeding by adults of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) on shelled maize: influence of damaged grain, adult crowding and grain density. In laboratory studies, adults of Prostephanus truncatus were found to prefer artificially or naturally (insect) damaged maize kernels to sound kernels when tested individually or in groups. Survival of P. truncatus was not significantly different...

Pierce, S.; Streloke, M.; Schmidt, GH., 1993: Lebensweise und Verbreitung des grossen Kornbohrers Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae). Zeitschrift fuer Angewandte Zoologie. 1992- ( ); 791: 45-64

Subramanyam, B.; Cutkomp, LK.; Darveaux, BA., 1985: A new character for identifying larval instars of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae). Three larval instars of Prostephanus truncatus were recognized in rearings at 25 degrees C and 75% RH based on the greatest distance between the ventrally sclerotized lateral structures of the frontoclypeus. This distance for the 1st, 2nd and 3rd...