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Medientyp:
E-Artikel
Titel:
Morphology and Ontogeny of Dermatocarpon Aquaticum
Beteiligte:
Stevens, Russell B.
Erschienen:
American Botanical Society, 1941
Erschienen in:
American Journal of Botany, 28 (1941) 1, Seite 59-69
Sprache:
Englisch
ISSN:
0002-9122;
1537-2197
Entstehung:
Anmerkungen:
Beschreibung:
<p>When inoculated into a common food supply (i.e., a bacterial colony) the myxamocbae of Diotyostelium discoideum and D. mucoroides vegetate simultaneously and in fruiting often aggregate into the same pseudoplasmodium, but the myxamoebae of the two species subsequently segregate and give rise to typical sorocarps of the two species. Myxamoebae of D. discoideum and Polysphondylium violaceum will likewise vegetate in common areas but from the outset enter separate fruiting organizations. A permanent union results when the anterior portion of a pseudoplasmodium of D. discoideum is grafted on a decapitated pseudoplasmodium of the same species; and a temporary union frequently occurs when a stalkless anterior portion of a pseudoplasmodium of D. purpureum is grafted on a decapitated pseudoplasmodium of D. discoideum; but no union takes place between pseudoplasmodial fractions of P. violaceum and D. discoideum. When pseudoplasmodia of two species of the Dictyosteliaceae are crushed and thoroughly intermixed in the presence of bacteria, the myxamoebae comprising them return to the vegetative stage, grow until the food supply is exhausted, and then form sorocarps typical of each species. When pseudoplasmodia of D. discoideum and P. violaceum are crushed and intermixed in the absence of bacteria, the myxamoebae of each species reorganize separately into small pseudoplasmodia that give rise to diminutive but typical sorocarps of the two species. But when pseudoplasmodia of D. discoideum and D. purpureum are similarly crushed and intermixed in the absence of food, small pseudoplasmodia appear which give rise to fruiting structures as follows: (1) small but typical sorocarps of D. discoideum, (2) small but typical sorocarps of D. purpureum, and (3) sorocarps combining characters of each species. Superficially these intermediates suggest hybrids but in reality they represent physical mixtures involving no genetic change.</p>