title: Basic pattern of fluctuation in hemolymph PTTH titers during larval-pupal and pupal-adult development of the silkworm, Bombyx mori.
abstract: General features of the changes in hemolymph PTTH titers during larval-pupal and pupal-adult development of the silkworm Bombyx mori were analyzed by comparing the patterns of the titer changes between different races and between silkworms reared under different environmental conditions. In common to all types of the silkworms tested, we observed low PTTH titers during the phagoperiod of the final instar, a small rise in PTTH titer on the day before wandering, two middle-sized peaks of the titer at the wandering and prepupal stages, high PTTH titers during early pupal-adult development, and a gradual titer increase shortly before adult eclosion. Increases in hemolymph PTTH titer were closely correlated with increases in ecdysteroid titers and with subsequent occurrences of morphological and behavioral changes characteristic of the initiation or progression of metamorphosis. The timing of the increase in hemolymph PTTH titer on the day of wandering was photoperiodically controlled, but that timing at the later stages seemed not to be influenced by the light-dark cycle.
authors.affiliation: Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan. mizoguch@bio.nagoya-u.ac.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Mizoguchi
authors.forename: Skarlatos G
authors.initials: SG
authors.lastname: Dedos
authors.forename: Hajime
authors.initials: H
authors.lastname: Fugo
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kataoka
mesh_terms: D000818:Animals; D012831:Bombyx / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D006458:Hemolymph / Q000737:chemistry / Q000378:metabolism*; D007301:Insect Hormones / Q000032:analysis / Q000378:metabolism*; D007814:Larva / Q000378:metabolism; D017440:Photoperiod; D011679:Pupa / Q000378:metabolism; D011863:Radioimmunoassay
chemical_list: D007301:Insect Hormones; C009089:prothoracicotropic hormone