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• W1985647956 abstract "RAWITSCHER-KUNKEL, ERIKA, and L. MACHLIS. (U. California, Berkeley.) hormonal integration of sexual reproduction in Oedogonium. Amer. Jour. Bot. 49(2): 177-183. Illus. 1962.Sexual reproduction in a heterothallic, nannandrous species of Oedogonium was investigated cytologically an.d physiologically. Several new observations a-re reported. Oogonial mother cells release a substance which attractsandrospores to them. androspores, when attached to the oogonial mother cells, grow in well-defined directions apparently in response to a hormone originating in the oogonial mother cells. An oogonial mother cell divides into an oogonium and a suffultory cell only after the attached androspores complete their development into dwarf males, each bearing an antheridium. Presumably the developing dwarf males provide a chemical stimulus for the division of the oogonial mother cell. During development, the oogonia become enveloped in a massive gel which also encases the antheridia cut off at the apical ends of the dwarf male plants. gel appears to function as a sperm trap, preventing the dissemination of the sperm into the surrounding liquid. sperm are attracted to the protoplasmic papilla which briefly protrudes through the oogonial pore indicating the operation of a second chemotactic agent. THE PURPOSE of this investigation was to obtain evidence that hormones control one or more phases of sexual reproduction in the green alga Oedogonium. More specifically, we were seeking a substance from Oedogonium with a function similar to that of sirenin from the watermold, Allomyces (Machlis, 1958a,b). immediately preceding paper (Machlis, 1962) introduces the over-all investigation of Oedogoniu'm. Two types of chemotaxis might be expected in Oedogonium. all species certain cells in a filament develop into oogonia, each containing a single egg. some species, other cells in the same filament or in separate male filaments give rise to antheridia from which are released motile sperm. These sperm might be expected to be attracted to the oogonia. Actual evidence for such a chemotaxis was published recently by Hoffman (1960). other species, androsporangia develop on the male filaments. motile androspores discharged from the androsporangia attach to oogonia or to oogonial mother cells (the progenitors of oogonia and suffultory cells) and there develop into 1-celled dwarf male plants. An antheridium is cut off at the apex of the dwarf male and subsequently releases the motile sperm. these nannandrous species chemotaxis of the androspores might be expected; however, except for the present report no evidence for 1 Received for publication July 24, 1961. This work was supported by a grant (G-7031) from the National Science Foundation. the chemotaxis of androspores has been published. We are informed, however, that such evidence is contained in the doctoral thesis of Hoffman (1961). literature does contain speculation on the possible occurrence of both kinds of chemotaxis. Thus, Pfeffer (1881) writes: In the case of Oedogo. nium the sperms apparently are attracted to the those species producing nannandrous males (dwarf males) a special, local activity seems to cause the settling of the androspores in determined areas in the vicinity of the oogonium. (Translated from the German:) Pfeffer's statement in relation to androspore behavior carries a reference to Pringsheim (1858) who wrote: The place in which the androspore settles upon the female plant is determined for each species. Settling occurs either on the oogonium itself, or in close vicinity thereof. (Translated from the German.) Later, Mainx (1931) wrote without further documentation or discussion that Some observations clearly show that the attraction of the antherozoids to the egg cell is of a chemotactic nature which ceases as soon as fertilization has occurred. (Translated from the German.) Finally, in his most recent review of the Oedogoniaceae, Tiffany (1957) wrote, presumably on the basis of his own observations: The behavior of both the sperm and the androspore suggests the formation of chemical substances (hormones), at least by the female cells, to which these flagellated cells respond. Sexuality in Oedogonium was first described by This content downloaded from 207.46.13.129 on Thu, 30 Jun 2016 04:55:22 UTC All use subject to http://about.jstor.org/terms" @default.
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• W1985647956 date "1962-02-01" @default.
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• W1985647956 title "THE NUTRITION OF CERTAIN SPECIES OF THE GREEN ALGA OEDOGONIUM" @default.
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• W1985647956 doi "https://doi.org/10.1002/j.1537-2197.1962.tb14925.x" @default.
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