title: Chloroplast ultrastructure and thylakoid polypeptide composition are affected by different salt concentrations in the halophytic plant Arthrocnemum macrostachyum.
abstract: The effect of different external salt concentrations, from 0 mM to 1030 mM NaCl, on photosynthetic complexes and chloroplast ultrastructure in the halophyte Arthrocnemum macrostachyum was studied. Photosystem II, but not Photosystem I or cytochrome b6/f, was affected by salt treatment. We found that the PsbQ protein was never expressed, whereas the amounts of PsbP and PsbO were influenced by salt in a complex way. Analyses of Photosystem II intrinsic proteins showed an uneven degradation of subunits with a loss of about 50% of centres in the 0 mM NaCl treated sample. Also the shape of chloroplasts, as well as the organization of thylakoid membranes were affected by NaCl concentration, with many grana containing few thylakoids at 1030 mM NaCl and thicker grana and numerous swollen thylakoids at 0 mM NaCl. The PsbQ protein was found to be depleted also in thylakoids from other halophytes.
authors: Dipartimento di Scienze dell'Ambiente e della Vita, Università del Piemonte Orientale,, viale Teresa Michel 11, 15121 Alessandria, Italy.
authors: Andrea
authors: A
authors: Trotta
authors: Susana
authors: S
authors: Redondo-Gómez
authors: Cristina
authors: C
authors: Pagliano
authors: Manuel Enrique Figueroa
authors: ME
authors: Clemente
authors: Nicoletta
authors: N
authors: Rascio
authors: Nicoletta
authors: N
authors: La Rocca
authors: Alessia
authors: A
authors: Antonacci
authors: Flora
authors: F
authors: Andreucci
authors: Roberto
authors: R
authors: Barbato
mesh_terms: D027703:Amaranthaceae / Q000254:growth & development / Q000378:metabolism / Q000648:ultrastructure*; D002736:Chloroplasts / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure*; D003580:Cytochromes / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D045331:Photosystem I Protein Complex / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000378:metabolism; D010937:Plant Growth Regulators / Q000378:metabolism; D055051:Salt-Tolerant Plants / Q000254:growth & development / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*; D013030:Spain; D020524:Thylakoids / Q000378:metabolism / Q000648:ultrastructure
chemical_list: D003580:Cytochromes; D008565:Membrane Proteins; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D010937:Plant Growth Regulators; C021261:thylakoid polypeptides; D012965:Sodium Chloride