The motile phase is commonly found under rotting logs and damp leaves, where cellulose is abundant. Food particles are lifted and engulfed into the slime mold as it glides along. Slime Moulds Life Cycle Slime moulds inhabit forest soil and consume bacteria and yeast, which they track by chemotaxis - chemical gradient sensing (of folic-acid in this case). The life cycle of an endogenous slime mold such as Physarum starts with the germination of a meiospore under favourable conditions. environment and form the next generation of amoebae cells. Use the pink labels for pink targets. Label the diagram to indicate the processes that are occurring as well as whether each cell type is haploid or diploid. Plasmodial slime molds are composed of large, multinucleate cells and move along surfaces like an amorphous blob of slime during their feeding stage (Figure 2). Dictyostelium discoideum is a species of soil-dwelling amoeba belonging to the phylum Amoebozoa, infraphylum Mycetozoa.Commonly referred to as slime mold, D. discoideum is a eukaryote that transitions from a collection of unicellular amoebae into a multicellular slug and then into a fruiting body within its lifetime. At some stages in their life cycle, they show clearly protozoan characteristics, but at other stages they become almost fungus-like. Slime molds are organisms in two taxonomic groups, the cellular slime molds (Phylum Acrasiomycota) and the plasmodial slime molds (Phylum Myxomycota). Then the life cycle is repeated. Under stress ( lack of food & water, temperatures changes etc. ) Usually the stalk disappears once the spores have been released. Life Cycle Since their discovery in the late nineteenth century, cellular slime molds have intrigued biologists. Cellular Slime Moulds: Habitat: The cellular slime moulds occur in all humus-containing upper layers of damp soil. Plasmodial slime molds form a single-celled, multinucleate mass, whereas cellular slime molds form an aggregated mass of separate amoebas that are able to migrate as a unified whole. The germinated spore can transform into either an amoeba-like myxamoeba cell or a flagellated swarm cell. Slime molds are categorized on the basis of their life cycles into plasmodial or cellular types, both of which end their life cycle in the form of dispersed spores. The diagram below illustrates the life cycle of Dictyostelium, a cellular slime mold. The slime molds are categorized on the basis of their life cycles into plasmodial or cellular types. Organisms in both groups are eukaryotic (meaning that their cells have nuclei) and are fungus-like in appearance during part of their life cycle… Examples: Physarum, Physarella, Fuligo, Dictydium, Lycogala, Tubifera. 2. The individual cells of cellular slime molds remain distinct-- separated by cell membranes-- during every phase of the mold's life cycle. The Plasmodium repeats the life cycle. Drag the labels to their appropriate locations on the diagram. amoebae will begin to secrete acarsin, a hormone-like substance which attracts other amoebae. The process by which the originally identical cells of the slime mold become transformed into multicellular structures composed of two different cell types - spore and stalk - is of Key Points. A third group, the Labyrinthulomycota or slime nets, are also called "slime molds", but appear to be more closely related to the Chromista, and not relatives of the other "slime mold" groups. Two broad groups of slime molds are recognized. Life cycle of Cellular Slime Moulds: Life cycle (Fig. Slime molds are categorized on the basis of their life cycles into plasmodial or cellular types, both of which end their life cycle in the form of dispersed spores. ; Plasmodial slime molds form a single-celled, multinucleate mass, whereas cellular slime molds form an aggregated mass of separate amoebas that are able to migrate as a unified whole. Their life cycle exhibits a curious alternative to the way in which most other creatures on earth grow, develop, and become multicellular, with different specialized tissues produced as … The life cycle of a slime mold begins with a haploid spore which is produced inside the fructification by meiosis. Cellular slime molds: Dictyostelium is a cellular slime mold which normally lives as single amoeboid cells.
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