Thursday, 29 April 2010

Slime Mold Question

Ive got mold on the brain, after a hefty amount of reseach i found myself asking the question, are we being asked to recreate the life cycle of a 'Plasmodial Slime Mold' or a 'Cellular Slime Mold'. From looking at the diagram provided to us be Peter Klappa i assumed it was Cellular Slime Mold, but upon further research i discovered some resemblence and am now not sure.

Or am i right in thinking that Plasmodial Slime Mold is the Asexual from and the Cellular Slime Mold is the Sexual reproductive form.

If it helps i found this piece of information on...

http://science.howstuffworks.com/fungi/slime-mold-info.htm

Slime Mold, an organism with some characteristics similar to those of fungi, and other characteristics similar to those of protists. There are more than 500 species of slime molds. They creep on decaying wood and in moist soil, ingesting bacteria and decaying vegetation. There are two major groups of slime molds: plasmodial, or true, slime molds and cellular slime molds.

Plasmodial Slime Molds:
The body of a plasmodial slime mold is the plasmodium, a thin, flat mass of protoplasm as long as 12 inches (30 cm). It does not have any cells, but its protoplasm contains structures similar to cell nuclei. The plasmodium is slimy to the touch and may be yellow, red, purple, or colorless. In response to adverse conditions (such as a lack of moisture), the plasmodium produces sporangia, typically round structures borne on stalks. Through an asexual process, sporangia produce structures called spores. The spores are scattered by the wind. When there is a sufficient amount of moisture, the spores develop into reproductive cells called gametes. Through a sexual process, the fusion of two gametes produces a new plasmodium.

Several species of microscopic, parasitic slime molds known as plasmodiophorans are classified with plasmodial slime molds by some biologists. Plasmodiophorans cause club-root disease in cabbage roots and powdery scab in potato plants.

Cellular Slime Molds:
The body of a cellular slime mold consists of many cells. They form a sluglike mass called a pseudoplasmodium. The pseudo-plasmodium eventually transforms itself into a stalklike structure called a sorocarp, which releases spores. Amoeboid cells emerge from the spores. After feeding for some time, the amoeboid cells gather together to form a new pseudoplasmodium. A cellular slime mold does not usually have a sexual stage in its life cycle.

3 comments:

  1. time to use the 'Klappa' email button, perhaps?

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  2. Hi Richard - Ethan had the same question and has also emailed Dr Klappa. Do you think you could post any reply you get from him on the group blog, just to clear up any confusion....thanks!

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