309:
agglutination was greatly increased by exposure to light. Even one minute of illumination soon after incubation had started was sufficient to trigger multiple centres of agglutination. One minute of exposure at a later stage was less effective. Although light was involved in agglutination, the introduction of some light exposed myxamoebae did not cause dark-only cells to clump. Other possible stimuli were tried but mostly had negative responses; heat was ineffective;
37:
328:
has similar effects to charcoal in light treated cells but a more marked effect in the dark cells where the resulting aggregations nearly reached that found in light treated cultures. The conclusions drawn from these experiments were that some form of suppressor may accumulate in the vicinity of the
308:
was added, created by allowing a drop of suspension to spread out over the surface of the non-nutrient agar to form a layer of even thickness. The myxamoebae were inoculated centrally on the plate. The culture was then incubated under different conditions of light and darkness and it was found that
272:
myxamoeba can move around at a speed of about 1 millimetre (0.04 in) per hour, leaving a chemical trail behind it. When it finds the trail left by another myxamoeba, it follows it, superimposing its own trace signal, and more and more individuals collect together in this way. Under favourable
215:. Like other slime moulds, it lives in soil, dung, leaf litter and other decaying organic materials. It is known as a myxamoeba and feeds on bacteria and fungal spores. In favourable, damp conditions it may reproduce sexually while in drier conditions,
235:
were found to exist in two separate mating types in an early (1975) study on the species, but a more recent morphological study left the question of the number of identifiable and separate mating types undecided. Under favourable damp conditions, a
187:. This slime mould has a world-wide distribution but there has been found to be variation between different samples and in a taxonomic revision in 2008, Kawakami and Hagiwara determined that some specimens originally described as
297:
Slime moulds are of interest to developmental biologists because they represent a link between single-celled organisms and multi-celled organisms. In an experiment to study the conditions necessary for agglutination,
329:
myxamoebae preventing them from agglutinating. Light exposure encouraged agglutination before much suppressor was present. Charcoal and mineral oil increased agglutination by absorbing the suppressor.
277:" in which they remain separate individuals but behave as if the whole mass was a single organism. The pseudoplasmodium can move around and in due course develops into a fruiting body called a
281:, about a third of the cells forming a stalk and the remaining cells forming a ball at the top where they develop into spores. The spores have a smooth wall containing
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289:. As the ball dries out, the spores are dispersed by the wind. The myxamoebae that form the supporting stem die, having sacrificed themselves for the greater good.
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increased the number of clumps in light treated cells and caused a slight increase in number of dark cells that agglutinated;
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cell, with a double complement of chromosomes. Other nearby amoeboid cells are absorbed into this diploid cell by
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Fun facts about fungi: Utah State
University Intermountain Herbarium. Retrieved 2012-03-13.
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was cultured on plates of hay-infusion agar. A thin surface layer of
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conditions, the myxamoebae agglutinate and stick together to form a "
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are formed and later released to be dispersed by air movements.
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had little effect but reduced clumping in light treated cells;
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will unite with another cell of opposite mating type to form a
223:, which guides other slime mould cells to move towards them.
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is more likely. The myxamoebae release a chemical agent,
367:
Proceedings of the
American Academy of Arts and Sciences
403:
Kawakami, Shin-ichi & Hagiwara, Hiromitsu (2008).
602:
405:"A taxonomic revision of two dictyostelid species,
552:"The influence of light on cell aggregation in
455:University of California. Retrieved 2012-03-12.
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363:"A preliminary enumeration of the Sorophoreae"
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156:of cellular slime mould, a member of the
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183:where it was growing on the dung of an
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252:to form a giant cell. This undergoes
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721:64adb340-2485-40ac-bb95-854d6352946d
256:and becomes a large cyst in which
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537:SparkNotes. Retrieved 2012-03-13.
453:Introduction to the "slime molds"
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208:starts life as a single-celled
351:Uniprot. Retrieved 2012-03-12.
1:
429:10.3852/mycologia.100.1.111
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240:cell with a single set of
191:were a different species,
754:Species described in 1901
510:10.1099/00221287-89-2-310
493:, a cellular slime mould"
179:was first described from
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120:
32:Scientific classification
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23:
604:Polysphondylium pallidum
554:Polysphondylium pallidum
550:Kahn, Arnold J. (1964).
491:Polysphondylium pallidum
407:Polysphondylium pallidum
361:Olive, Edgar W. (1901).
347:Polysphondylium pallidum
300:Polysphondylium pallidum
270:Polysphondylium pallidum
233:Polysphondylium pallidum
206:Polysphondylium pallidum
177:Polysphondylium pallidum
149:Polysphondylium pallidum
131:Polysphondylium pallidum
25:Polysphondylium pallidum
560:The Biological Bulletin
489:"Macrocyst genetics in
16:Species of slime mould
468:The Blob: Slime Molds
349:(Cellular slime mold)
194:Polysphondylium album
487:Francis, D. (1975).
264:Asexual reproduction
217:asexual reproduction
320:had little effect;
318:potassium hydroxide
268:In damp weather, a
227:Sexual reproduction
473:2012-03-22 at the
231:The myxoedemae of
749:Amoebozoa species
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275:pseudoplasmodium
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113:P. pallidum
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89:Dictyosteliidae
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69:Dictyostelia
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535:Slime Molds
326:mineral oil
242:chromosomes
189:P. pallidum
738:Categories
333:References
279:sporangium
744:Mycetozoa
417:Mycologia
283:cellulose
173:lectotype
161:Mycetozoa
107:Species:
59:Amoebozoa
49:Eukaryota
693:MycoBank
685:10383065
654:Fungorum
633:60032642
628:AusFungi
619:Q7226961
613:Wikidata
471:Archived
437:18488357
411:P. album
387:20021671
322:charcoal
293:Research
210:amoeboid
167:Taxonomy
85:Family:
55:Phylum:
45:Domain:
672:3212509
646:1016451
580:1539346
519:1236929
254:meiosis
246:diploid
238:haploid
221:acrasin
213:protist
201:Biology
181:Liberia
154:species
95:Genus:
75:Order:
65:Class:
718:NZOR:
698:171850
659:171850
578:
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287:chitin
258:spores
158:phylum
140:(1901)
680:IRMNG
576:JSTOR
383:JSTOR
152:is a
138:Olive
667:GBIF
515:PMID
433:PMID
409:and
171:The
706:NBN
641:EoL
568:doi
564:127
505:doi
425:doi
421:100
375:doi
185:ass
175:of
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