Further observation on the early regenerates after fission in the planarian Dugesia japonica
Hori, I.; Kishida, Y. (2001). Further observation on the early regenerates after fission in the planarian Dugesia japonica. Belg. J. Zool. 131(Suppl. 1): 117-121
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451, more
Also appears in:
Saló, E.; Watson, N.; Schockaert, E. (Ed.) (2001). Proceedings of the 9th International Symposium on the Biology of the Turbellaria, Barcelona, Spain, June 2000. Belgian Journal of Zoology, 131(Suppl. 1). Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Diepenbeek. 236 pp., more
In addition to possessing remarkable regeneration powers, many species of planatians reproduce asexually by fission. Since fission takes place at the post-pharyngeal region in most cases, we amputated this body portion of intact animals and compared their regeneration process with that of fission fragments.The fission fragments formed a well-defined blastema in the early regenerates, and the number of blastema-forming cells of the regenerates was larger than that of the amputated ones. When we compared the early regenerates from posterior fragments with those from anterior ones, it was clearly confirmed that posterior fragments invariably regenerated more rapidly. The present observations on the pre-fissioning planarians suggest that the rapid development of the early blastema is induced by fixed parenchyma cells at the preparatory parenchymal region for fissioning.
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