Ultrastructural Changes During Germination of Dictyostelium discoideum Spores
AUTOR(ES)
Cotter, David A.
RESUMO
Spores of Dictyostelium discoideum undergo significant changes in fine structure during germination. The mitochondria progressively become less dense and lose their peripherally attached ribosomes, and the tubuli become more pronounced as germination proceeds. During this period, the three-layered spore wall breaks down in two stages: first, the outer and middle layers are ruptured as a unit, and, second, the inner wall is breached. Crystals and dark (lipid) bodies disappear shortly before or during emergence of the myxamoebae. Autophagic vacuoles are found in dormant spores and throughout the entire germination process. The addition of cycloheximide to germinating spores inhibited the loss of the crystals and dark (lipid) bodies. In addition, the drug inhibited the breakdown of the inner wall layer. Cycloheximide did not prevent the formation of the water expulsion vesicle or the apparent function of the autophagic vacuoles.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=250189Documentos Relacionados
- Cellulases released during the germination of Dictyostelium discoideum spores.
- Expression of glycosidase activities during germination of Dictyostelium discoideum spores.
- Regulation of protein synthesis during spore germination in Dictyostelium discoideum.
- Ultrastructural Analysis During Germination and Outgrowth of Bacillus subtilis Spores
- Respiratory competence of Dictyostelium discoideum spores.