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OCCURRENCE AND PHYLOGENETIC SIGNIFICANCE OF “SPECIAL WALLS” AT MEIOSPOROGENESIS IN COLEOCHAETE
Author(s) -
Graham Linda E.,
Taylor Claude
Publication year - 1986
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1986.tb12080.x
Subject(s) - biology , sporogenesis , spore , botany , adaptation (eye) , callose , zygote , sporangium , plant evolution , cell wall , embryo , microbiology and biotechnology , embryogenesis , biochemistry , neuroscience , genome , gene
Within germinating zygotes of Coleochaete pulvinata, meiospores are individually surrounded by chamber walls which are ultrastructurally and chemically different from vegetative cell walls of the same species. Meiospore chamber walls exhibit the staining reactions typical of callose. They thus resemble the “special walls” present during sporogenesis in embryophytes. Their presence suggests that the charophycean green algal ancestors of land plants may have possessed spore development preadaptations influential in the evolution of walled spores, an important plant adaptation to terrestrial life.