title: Life extension in Drosophila maintained under lengthened light/dark regime.
abstract: In the present study, we investigated whether the length of light/dark cycle could influence the pre-adult developmental time and adult life span in Drosophila melanogaster. Flies were reared to adulthood and maintained as adults under both 24-h (light/dark 12:12 h) and 48-h (light/dark 24:24 h) cycles. The flies reared during pre-adult stages at the 48-h light/dark cycle had significantly prolonged developmental time compared to those in flies reared at normal 24-h cycle. Irrespective of the duration of pre-adult light/dark period, the males maintained as adults at prolonged 48-h cycle had a 13-16% longer mean adult life span than those maintained at normal 24-h cycle (P<0.001 in all cases). In females reared under normal 24-h cycle such differences were lower but also significant (P=0.03); no significant difference in life span was found in females reared under prolonged 48-h cycle. The results are interpreted to demonstrate that pre-adult developmental time and adult life span in Drosophila melanogaster are both influenced by the length of light/dark cycle.
authors.affiliation: Institute of Gerontology, Kiev, Ukraine. vaiserman@geront.kiev.ua
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Vaiserman
authors.forename: Anatoly V
authors.initials: AV
authors.lastname: Pisaruck
authors.forename: Albert N
authors.initials: AN
authors.lastname: Timchenko
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Voitenko
authors.forename: Natalya M
authors.initials: NM
authors.lastname: Koshel
authors.forename: Pavel E
authors.initials: PE
authors.lastname: Grigoriev
mesh_terms: D000818:Animals; D001683:Biological Clocks / Q000502:physiology; D003624:Darkness; D004330:Drosophila / Q000502:physiology*; D005260:Female; D008017:Life Expectancy; D008027:Light; D008136:Longevity; D008297:Male; D017440:Photoperiod