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OBSERVATIONS ON MARINE CHAETOPHORACEAE (CHLOROPHYTA). I. SPORANGIAL ONTOGENY IN THE TYPE SPECIES OF ENTOCLADIA AND PHAEOPHILA 1
Author(s) -
O'Kelly Charles J.,
Yarish Charles
Publication year - 1980
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1980.tb03073.x
Subject(s) - biology , multinucleate , mitosis , botany , spore , morphogenesis , cytokinesis , ultrastructure , cleavage (geology) , blastomere , major duodenal papilla , microbiology and biotechnology , cell division , cell , anatomy , embryogenesis , embryo , paleontology , biochemistry , gene , fracture (geology)
A light‐ and electron‐microscope study of sporangial ontogeny in synchronized, mitospore‐producing cultures of Entocladia viridis Reinke, and Phaeophila dendroides (Crouan frat.) Ratters demonstrates that each species has its own characteristic pattern of sporangial development. E. viridis undergoes a sequential cleavage of sporangial mother cell contents with cytokinesis always promptly following mitosis, thus no multinucleate cells are produced. No vesicle surrounds the mature spores, which are released by abrupt rupture of the exit papilla. In P. dendroides a simultaneous cleavage of the sporangial mother cell occurs after a series of synchronous mitoses that result in the production of a multinucleate cell. No vesicle surrounds the mature spores, but a membranous inclusion derived from the central vacuole of the sporangial mother cell lines the sporangial neck at maturity. The inclusion is extruded as a hyaline “plug” through the apex of the sporangial neck some time before release of the spores. This information argues for the retention of the two genera Entocladia and Phaeophila, and suggests another means of deducing higher taxonomic relationships among the marine Chaetophoraceae.