Chroococcidiopsis sp. cells from hot desert rock (Timna National Park, Israel) were grown in modified BG-11 medium which was either N-free or which contained different concentrations of nitrogen, provided as nitrate. The life cycle, ultrastructure and physiological activities of the cyanobacterium were investigated over a period of 4 months. No alterations were detected in cells grown in medium containing 250 or 125 Î¼g N ml-1. In contrast, cells grown in medium with 62 Î¼g N ml-1 or lacking nitrogen occurred only as isolated viable forms, after 3 months and 1 month of growth, respectively. In these cells a decrease in the content of cellular chlorophyll and phycocyanin paralleled undetectable O2 evolution and depressed O2 uptake. In addition, such isolated cells were characterized by a multilayered envelope, whereas, in the cytoplasm, vesiculated thylakoids and glycogen granules were observed. N-limited and N-starved cells recovered their cellular organization and physiological activities upon N repletion. These 'survival' cells had a spore-like form, and were functionally comparable to akinetes.
|Tipologia:||Articolo su rivista|
|Citazione:||Billi, D., & Grilli Caiola, M. (1996). Effects of nitrogen limitation and starvation on Chroococcidiopsis sp. (Chroococcales). NEW PHYTOLOGIST, 133(4), 563-571.|
|IF:||Con Impact Factor ISI|
|Settore Scientifico Disciplinare:||Settore BIO/01 - Botanica Generale|
|Revisione (peer review):||Sì, ma tipo non specificato|
|Digital Object Identifier (DOI):||10.1111/j.1469-8137.1996.tb01925.x|
|Stato di pubblicazione:||Pubblicato|
|Data di pubblicazione:||1996|
|Titolo:||Effects of nitrogen limitation and starvation on Chroococcidiopsis sp. (Chroococcales)|
|Autori interni:||BILLI, DANIELA|
|Autori:||Billi, D ;Grilli Caiola, M|
|Appare nelle tipologie:||01 - Articolo su rivista|
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