6 1-1-presentacion-cap-iv
TRANSCRIPT
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AMOEBOZOA
“plasmodial mohos
mucilaginosos”
EVOLUCION
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4.000 m.a.
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RELACIONES CRUZADAS 11
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CAPITULO IV.
Amoebozoa
“mohos mucilaginosos”
(con amoeba = célula desnuda)
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AMOEBA
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Physarum
en medio
de cultivo
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-las amoebas forman: pseudoplasmodio (son amoebas agregadas, pero con membrana individual),
AMOEBOZOA
“mohos mucilaginosos”.
Características generales.
-eukaryota,
-unicelulares -plasmodiales
-forman colonias -no fotosintéticos
-se les conoce como “mohos mucilaginosos”, -unidad del talo: es la amoeba (una célula sin pared celular,
sólo tienen membrana celular),
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-las amoebas forman: pseudoplasmodio (son amoebas agregadas,
pero con membrana individual),
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-las amoebas también forman: plasmodio (grupo de amoebas que se fusionan, sin pared celular, y multinucleadas),
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-fagotróficos: se alimentan por ingestión. -para alimentarse (estado fagotrófico) forman colonias -son saprofíticos en detritus, materia de pequeños animales,
-habitantes de suelo humedo,
vegetal en descomposición, y excremento
-algunos son patógenos,
DOS FLAGELOS LISOS
ANTERIORES PLASMODIO DENTRO DE
CELULA
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-pueden formar cuerpos fructíferos.
ESPORANGIO
TALLO
SOROCARPO
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Dictyostelium discoideum
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Physarum sp. (plasmodio)
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Physarum sp.
(SOROCARPO: estado reproductivo)
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Amoebozoa:
-“mohos mucilaginosos”
-forman plasmodio,
-saprofíticos, y parásitos ? o
contaminantes de
plantas ???
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Physarum sp.
AGRIOS, 2005
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Pairing of zoospores
Zoospore emerging from resting spore
Myxamoeba
f Plasmodium
Resting
spores
Fructifications on leaf
Plasmodium on soil
surface and on leaf
Physarum
Plasmodium and fructifications on leaf sp.
AGRIOS, 2005
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AGRIOS, 2005
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BEGONIA (ORNAMENTAL)
AGRIOS, 2005
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Generales caracteres de diagnóstico:
-forma del esporocarpo (cuerpo fructífero),
-esporangio: con peridio
(+ calículo y “capilicio” en
algunas especies)
-esporas: tamaño, color y ornamentación
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Physarum sp.
HERRERA Y ULLOA, 1998
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ESPORANGIOS Hemitrichia sp.
(peridio o calículo)
HERRERA Y ULLOA, 1998
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HERRERA Y ULLOA, 1998
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cio.
y
Esporas
'-:)
"
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(a) (b)
(e) 5 mm (d) 10mm 1 1 1 1
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·
HERRERA Y ULLOA, 1998
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HERRERA Y
ULLOA,
1998
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