このエントリーをはてなブックマークに追加
ID 47679
FullText URL
Author
Abdelsalam, Salaheldin
Abstract
The circadian system of hemimetabolous insects is reviewed in respect to the locus of the circadian clock and multioscillatory organization. Because of relatively easy access to the nervous system, the neuronal organization of the clock system in hemimetabolous insects has been studied, yielding identification of the compound eye as the major photoreceptor for entrainment and the optic lobe for the circadian clock locus. The clock site within the optic lobe is inconsistent among reported species; in cockroaches the lobula was previously thought to be a most likely clock locus but accessory medulla is recently stressed to be a clock center, while more distal part of the optic lobe including the lamina and the outer medulla area for the cricket. Identification of the clock cells needs further critical studies. Although each optic lobe clock seems functionally identical, in respect to photic entrainment and generation of the rhythm, the bilaterally paired clocks form a functional unit. They interact to produce a stable time structure within individual insects by exchanging photic and temporal information through neural pathways, in which serotonin and pigment-dispersing factor (PDF) are involved as chemical messengers. The mutual interaction also plays an important role in seasonal adaptation of the rhythm.
Keywords
circadian system
clock tissue
hemimetabolous insects
optic lobe
Published Date
2004-12
Publication Title
Zoological Science
Volume
volume21
Issue
issue12
Publisher
Zoological Society of Japan
Publisher Alternative
日本動物学会
Start Page
1153
End Page
1162
ISSN
0289-0003
NCID
AA10545874
Content Type
Journal Article
language
英語
Copyright Holders
© 2004 Zoological Society of Japan
File Version
publisher
Refereed
True
DOI
PubMed ID
Web of Sience KeyUT