title: [Somatic embryogenesis of certain Spongillidae during the reproductive period of their life cycle].
abstract: Development of small fragments taken from the body of some Spongillidae (Halichondria panicea, Spongilla lacustris) was studied during various periods of their reproductive cycle. Reconstructive morphogenesis of fresh-water sponges from small pieces of their body tissue took 5-7 days and did not depend on the stage of the reproductive cycle in the maternal organism. Form-restoring potentials in marine reproductive sponges were different. The least potentials for the development into new species were noted in the fragments containing oocytes at stages of vitellogenesis, embryos and larvae. The sponge fragments having embryos and larvae perished before they began to develop. Restorative morphogenesis of the fragments having oocytes at the stage of vitellogenesis lasted two months, while the development of the fragments having oogonia and oocytes at early stages of development transformed into a young sponge during two weeks. The fate of oocytes, embryos and larvae under conditions of restorative morphogenesis was different: oogonia and oocytes at early stages of development were preserved, while oocytes at the stage of vitellogenesis and embryos were mostly resorbed. Most of larvae completed their embryogenesis, however, if they were lesioned, external and internal larval cells could participate in the restorative process.
mesh_terms: D000818:Animals; D046508:Culture Techniques; D005260:Female; D009024:Morphogenesis; D009866:Oogenesis; D010063:Ovum / Q000648:ultrastructure; D011161:Porifera / Q000166:cytology / Q000196:embryology*; D013045:Species Specificity
vernacular_title: Somaticheskiĭ émbriogenez nekotorykh kremnerogovykh gubok v reproduktivnyĭ period ikh zhiznennogo tsikla.