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Titolo:
ALTERNATION IN PHOTOSYNTHETIC CHARACTERISTICS OF ANABAENA-DOLIOLUM FOLLOWING EXPOSURE TO UVB AND PB
Autore:
RAI LC; TYAGI B; MALLICK N;
Indirizzi:
INST BIOTECHNOL 3,POB 1913 D-52425 JULICH GERMANY BANARAS HINDU UNIV,DEPT BOT,ALGAL BIOL LAB VARANASI 221005 UTTAR PRADESH INDIA
Titolo Testata:
Photochemistry and photobiology
fascicolo: 4, volume: 64, anno: 1996,
pagine: 658 - 663
SICI:
0031-8655(1996)64:4<658:AIPCOA>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRAVIOLET-B RADIATION; CARBON-DIOXIDE CO2; II REACTION-CENTER; PHOTOSYSTEM-II; OZONE DEPLETION; NOSTOC-MUSCORUM; INHIBITION; DEGRADATION; VEGETATION; THYLAKOIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
L.C. Rai et al., "ALTERNATION IN PHOTOSYNTHETIC CHARACTERISTICS OF ANABAENA-DOLIOLUM FOLLOWING EXPOSURE TO UVB AND PB", Photochemistry and photobiology, 64(4), 1996, pp. 658-663

Abstract

Anabaena doliolum, when exposed to either ultraviolet-B (UVB) radiation or Pb, showed reduced growth rate, carbon fixation, O-2-evolution, photosynthetic electron transport activity and ATP pool size, The rateof respiration was found to increase in UVB-treated cells; this increase was more pronounced in the cells exposed to UVB and Pb simultaneously. The UVB-induced inhibition of 2,6-dichlorophenol indophenol (DCPIP) photoreduction and lowering of chlorophyll a fluorescence could notbe reversed by artificial electron donors (diphenyl carbazide, NH2OH and MnCl2). These electron donors, however, substantially reversed theinhibition caused by Pb, thereby suggesting that UVB primarily inhibits the photosystem II (PS II) reaction center and Pb arrests the electron flow at the water splitting site, Nevertheless, the suppressed fluorescence intensity and the reduced emission and excitation peaks of phycobilisomes indicate the involvement of Pb in inhibition of PS II, All combinations of UVB and Pb inhibited the different metabolic processes in a synergistic manner.

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Documento generato il 22/09/20 alle ore 11:13:05