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Titolo:
Spectroscopic analysis of desiccation-induced alterations of the chlorophyllide transformation pathway in etiolated barley leaves
Autore:
Le Lay, P; Boddi, B; Kovacevic, D; Juneau, P; Dewez, D; Popovic, R;
Indirizzi:
Univ Quebec, Ctr Rech Toxicol Environm, Dept Chem, Montreal, PQ H3C 3P8, Canada Univ Quebec Montreal PQ Canada H3C 3P8 Chem, Montreal, PQ H3C 3P8, Canada Lorand Eotvos Univ, Dept Plant Anat, H-1088 Budapest, Hungary Lorand Eotvos Univ Budapest Hungary H-1088 nat, H-1088 Budapest, Hungary
Titolo Testata:
PLANT PHYSIOLOGY
fascicolo: 1, volume: 127, anno: 2001,
pagine: 202 - 211
SICI:
0032-0889(200109)127:1<202:SAODAO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYSTEM-II; PROTEIN COMPLEXES; PLANT-LEAVES; PROTOCHLOROPHYLLIDE; BIOSYNTHESIS; STRESS; NADPH; FLASH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Popovic, R Univ Quebec, Ctr Rech Toxicol Environm, Dept Chem, Succursale Ctr Ville,Case Postale 8888, Montreal, PQ H3C 3P8, Canada Univ Quebec Succursale Ctr Ville,Case Postale 8888 Montreal PQ Canada H3C 3P8
Citazione:
P. Le Lay et al., "Spectroscopic analysis of desiccation-induced alterations of the chlorophyllide transformation pathway in etiolated barley leaves", PLANT PHYSL, 127(1), 2001, pp. 202-211

Abstract

Effects of water deficit on the chlorophyllide (Chlide) transformation pathway were studied in etiolated barley (Hordeum vulgare) leaves by analyzingabsorption spectra and 77-K fluorescence spectra deconvoluted in components. Chlide transformations were examined in dehydrated leaves exposed to a 35-ms saturating flash triggering protochlorophyllide (Pchlide) and Chlide transformation processes. During the 90 min following the flash, we found that dehydration induced modifications of Chlide transformations, but no effect on Pchlide phototransformation into Chlide was observed. During this time, content of NADPH-Pchlide oxydoreductase in leaves did not change. Chlidetransformation process in dehydrated leaves was characterized by the alteration of the Shibata shift process, by the appearance of a new Chlide species emitting at 692 run, and by the favored formation of Chl(ide) A(668)F(676). The formation of Chl(ide) A(668)F(676), so-called "free Chlide," was probably induced by disaggregation of highly aggregated Chlide complexes. Here, we offer evidence for the alteration of photoactive Pchlide regenerationprocess, which may be caused by the desiccation-induced inhibition of Pchlide synthesis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:01:47