By Roger Wodehouse
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Actual nuclear fusion, as occurs in sexual reproduction, is therefore not essential for the new form of growth. 17. Polysiphonia. (a) Habit. (b) Mature cystocarp discharging carpospores. (c) Sporophyte with a tetrasporangiate branch, some of the tetraspores escaping. nuclear fusion presumably occurs subsequently since functional tetrasporangia have also been observed following parasexual plasmatic fusion. Aberrant life cycles have also been discovered in natural populations of advanced Florideophycidae.
9) (both of which are currently placed in a separate division, Glaucophyta) probably arose from endosymbionts of this kind. The boundary of the cyanelle appears to retain a peptidoglycan. Cyanelles may divide after being expressed from the host cell, but it has not been possible to culture them indefinitely in isolation. The DNA of cyanelles contains less genetic information than that of free-living species, so there appears to have been some loss in response to the endosymbiotic habit. , the presence of Anabaena in the fern Azolla (p.
Reproduction is anisogamous in C. braunii, the Ϫ strain producing four macrogametes and the ϩ strain eight microgametes. The oogamous state is approached in C. coccifera in which the cells of one strain produce a single macrogamete and those of the other 16 or 32 microgametes. It is reasonable to envisage anisogamy having evolved from isogamy, and experiments with isogamous strains have shown how this may have come about. A large number of mitoses before gametogenesis results in smaller gametes.