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Titolo:
Possible neural control of asexually reproductive fragmentation in Enchytraeus japonensis (Oligochaeta, Enchytraeidae)
Autore:
Inomata, K; Kobari, F; Yoshida-Noro, C; Myohara, M; Tochinai, S;
Indirizzi:
Hokkaido Univ, Grad Sch Sci, Div Biol Sci, Sapporo, Hokkaido 0600810, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600810 oro, Hokkaido 0600810, Japan RIKEN, Inst Phys & Chem Res, Brain Sci Inst, Brainway Grp, Wako, Saitama 3510198, Japan RIKEN Wako Saitama Japan 3510198 ainway Grp, Wako, Saitama 3510198, Japan Natl Inst Sericultural & Entomol Sci, Dept Insect Genet & Breeding, Tsukuba, Ibaraki 3058634, Japan Natl Inst Sericultural & Entomol Sci Tsukuba Ibaraki Japan 3058634 Japan
Titolo Testata:
INVERTEBRATE REPRODUCTION & DEVELOPMENT
fascicolo: 1, volume: 37, anno: 2000,
pagine: 35 - 42
SICI:
0792-4259(200001)37:1<35:PNCOAR>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXYTOCIN-RELATED PEPTIDE; CEPHALIC MECHANISM; EISENIA-FOETIDA; SOCIAL-CONTROL; IDENTIFICATION; LOCALIZATION; PLANARIANS; ANNETOCIN; EARTHWORM;
Keywords:
asexual reproduction; fragmentation; regeneration; neural control; enchytraeid;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Tochinai, S Hokkaido Univ, Grad Sch Sci, Div Biol Sci, Sapporo, Hokkaido 0600810, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600810 o 0600810, Japan
Citazione:
K. Inomata et al., "Possible neural control of asexually reproductive fragmentation in Enchytraeus japonensis (Oligochaeta, Enchytraeidae)", INVERTEBR R, 37(1), 2000, pp. 35-42

Abstract

The enchytraeid oligochaete Enchytraeus japonensis reproduces asexually byfragmentation under laboratory conditions. In the fragmentation process, fully-grown worms break into several fragments. Each fragment regenerates into a small but complete worm in 4 days, grows rapidly and divides again in another 10 days. We found that this fragmentation can be induced artificially by amputating the head if the worms are at least 5-6 mm in length, but not in shorter worms. The fragmentation is inducible by removing the most anterior two segments, if the worms are large enough. When a worm is cut intotwo, fragmentation occurs more readily in the posterior section. Moreover,even a small incision made in the ventral side of the trunk causes fragmentation in the body posterior to the incision. Immersion of the worms in water is found to inhibit fragmentation even in decapitated worms. When a wormis placed in water immediately after decapitation, the ability to fragmentis gradually lost as a new head regenerates. From these results it is postulated that the ability to fragment acquired early in the growth phase is suppressed by head-derived signal(s) until spontaneous fragmentation occurs. The signals seem to be constantly transmitted through the ventral nerve cord until the head matures and lifts its blockade of fragmentation, allowingthis process to proceed. At present, however, we cannot exclude the possibility that the mature head of the worm produces fragmentation-stimulating signals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 07:36:58