MYXOMYCOTA Plasmodial slime molds No real parasitic forms ...
MYXOMYCOTA Plasmodial slime molds No real parasitic forms Heterotrophic Abundant in temperate forests Plasmodial stage is found in cool, shady, moist places on rotting logs, leaf litter and moist shaded soil Plasmodia: naked network of protoplasm, engulfing decaying organic matter, bacteria, protozoa and other organisns, Veins: transfer materials. Density can be changed by adding proteins. Increase cytoplasm density that forms hollow tubes. Coenocytic: single massive multinucleate cell Cyclosis: cytoplasmic streaming Synchronous nuclei division: all in the same stage of mitosis at the same time. Valuable cell biology tool. All closed mitosis in the plasmodial stage. Spindle apparatus inside the nuclear envelope Mitosis in the amoeboid stages is open mitosis 3 different types of plasmodia recognized phaneroplasmodium: conspicuous protoplasmic veins with shuttle stream. Leaves behind a trace as the plasmodium creeps over the surface. Slime left behind becomes part of the aggregates for soils aphaneroplasmodium: nongranular and very transparent. No slime sheath protopasmodium: most primitive. Smallest. Sclerotium: unfavourable conditions of moisture and nutrition, a hard dormant body. Nuclei within the protoplasm aggregate and form cell walls around themselves (spherules: uni/multinucleate macrocytes) Virtually inanimate Sexual reprudction: sporophores. Spore formation 4 main types of sphorophores. Sporangia, plasmodiocarps, aethalia, pseudoaethalia. Hypothallus: old mass of protoplasm Capillitia: hygroscopic. Protein fibers expand and contract with the air humidity to disperse the spores Plasmodiocarp: typically sessile. Irregular in shape, can be branched or netlike. Formed by secreting a peridium around the veins or parts of the veins of a plasmodium just after it stops streaming and prepares to sporulate Pseudoaethalia: tight affrigations of sporangia, often on a single stals. With resemble single spore bearing units Aethalia: single large chamber where the nuclei aggregate and spores are produced. No individual spore walls inside.
After being dispersed, the walled spores germinate into a myxomoeba flagellated swarmer cells Plasmodiophorids Group of protists form zoospores with 2 unequal flagella Obligate parasties of flowering plants, some attack algae or aquatic fungi Develop within plant cells, causing growth of gall or scabs Club root in cabbage is caused by this Vegetative form: naked, multinucleate plasmodial cell. Lies imbedded in the host protoplasm, separated only by a plasma membrane Nuclear divisions have a unique crosslike appearance, leading to the term cruciform division Closed mitosis Plasmodia ultimately divides to form new spores released when cell breaks. Spores deposited in the soil, contaminating it
After being dispersed, the walled spores germinate into a myxomoeba flagellated swarmer cells Plasmodiophorids Group of protists form zoospores with 2 unequal flagella Obligate parasties of flowering plants, some attack algae or aquatic fungi Develop within plant cells, causing growth of gall or scabs Club root in cabbage is caused by this Vegetative form: naked, multinucleate plasmodial cell. Lies imbedded in the host protoplasm, separated only by a plasma membrane Nuclear divisions have a unique crosslike appearance, leading to the term cruciform division Closed mitosis Plasmodia ultimately divides to form new spores released when cell breaks. Spores deposited in the soil, contaminating it
