title: Maternal and paternal nitrogen investment in Blattella germanica (L.) (Dictyoptera; Blattellidae).
abstract: The investment of nitrogenous materials by female and male German cockroaches Blattella germanica (L.) into their progeny was examined. Adult females maintained on dog food invested 34% of their dry mass and 26% of their nitrogen into an oothecae during their first gonadotrophic cycle. Females maintained on a low- (5%) protein diet and injected simultaneously with [3H]leucine and [14C]hypoxanthine incorporated less [3H]leucine-derived radiolabel in their oothecae than those on a dog food diet (25% crude protein). Females on the low-protein diet incorporated more [14C]hypoxanthine-derived material (primarily as [14C]urates) into their oothecae than they retained in their bodies. Stored [14C]urates were metabolized more readily by females on the low-protein diet. Oothecae obtained from females provided with an [15N]urate-amended diet contained at least four 15N-enriched amino acids, which supports the hypothesis that urates are utilized as a nitrogen resource in these insects. Dietary effects on paternal investment were also found to be significant. Females fed a low-protein diet and their oothecae contained 63% of the radiolabel made available to them at mating when paired with males injected simultaneously with [3H]leucine and [14C]hypoxanthine, whereas dog-food-fed females and their oothecae contained only 17% of the total radiolabel made available to them at mating.
authors.affiliation: Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg 24061.
authors.forename: D E
authors.initials: DE
authors.lastname: Mullins
authors.forename: C B
authors.initials: CB
authors.lastname: Keil
authors.forename: R H
authors.initials: RH
authors.lastname: White
mesh_terms: D000818:Animals; D002250:Carbon Radioisotopes; D003058:Cockroaches / Q000196:embryology / Q000502:physiology*; D004044:Dietary Proteins / Q000008:administration & dosage; D005260:Female; D019271:Hypoxanthine; D007042:Hypoxanthines / Q000378:metabolism; D007930:Leucine / Q000378:metabolism; D008297:Male; D009584:Nitrogen / Q000378:metabolism* / Q000502:physiology; D012098:Reproduction; D014316:Tritium; D014527:Uric Acid / Q000378:metabolism
chemical_list: D002250:Carbon Radioisotopes; D004044:Dietary Proteins; D007042:Hypoxanthines; D014316:Tritium; D014527:Uric Acid; D019271:Hypoxanthine; D007930:Leucine; D009584:Nitrogen