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Post fertilization development in the red alga Polysiphonia 1. Proliferation of the carposporophyte



Post fertilization development in the red alga Polysiphonia 1. Proliferation of the carposporophyte



Journal of Ultrastructure Research 70(3): 259-274



The diploid carposporophyte which develops attached to the gametophyte of Polysiphonia becomes differentiated into several distinct regions. Apically growing cells of the meristematic gonimoblast, some of which eventually develop into diploid carpospores, are observed to contain only lightly pigmented proplastids. As growth continues, the inner cells of the gonimoblast cease dividing and undergo considerable cytoplasmic change prior to incorporation into the expanding fusion cell. Cells appear active in protein synthesis while proplastids and nuclei break down. A limited number of adjacent gametophyte cells are likewise added to the fusion cell, a structure which is devoid of both plastids and nuclei. All cells of the differentiating carposporophyte are interconnected by morphologically distinct transfer connections, which differ from normal red algal pit connections in that they are intracellular rather than extracellular. Transfer connections may enhance the transport of nutritive materials within the carposporophyte and toward the meristematic cells at the margin.

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Accession: 006151397

Download citation: RISBibTeXText

PMID: 7373694

DOI: 10.1016/s0022-5320(80)80010-4


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