par Rasmont, Raymond 
Référence Current Topics in Developmental Biology, 10, C, page (141-159)
Publication Publié, 1975-01
Référence Current Topics in Developmental Biology, 10, C, page (141-159)
Publication Publié, 1975-01
Article révisé par les pairs
| Résumé : | This chapter describes the sponges that are a suitable material for studying cell-to-cell interactions in the course of their normal development. Freshwater sponges reproduce asexually, by producing gemmules; this mode of “somatic” reproduction makes it possible to obtain the “clonal” cultures in the laboratory as well as in the field. The chapter discusses the physiological aspects of the asexual reproduction of freshwater sponges. The general anatomy of freshwater sponges is described in this chapter. However, it should be stressed that the histological organization of these animals is far from being as stable as that of higher metazoa. Time-lapse cinematography of “sandwich cultures” of sponges makes it clear that every structure, even choanocyte chambers and spicules, are very mobile. A live sponge is more in the nature of a dynamic society of individual cells than a stable tissue organization. The asexual reproduction of freshwater sponges has been studied on small individuals cultivated in petri dishes. The formation of gemmules depends on the ecological factors and on the intrinsic factors. Gemmulation is enhanced by theophylline. © 1975, Academic Press Inc. |
