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Titolo:
PHYSIOLOGICAL AND BIOCHEMICAL-STUDIES ON AN ACID-TOLERANT CHLORELLA-VULGARIS UNDER COPPER STRESS
Autore:
RAI PK; MALLICK N; RAI LC;
Indirizzi:
BANARAS HINDU UNIV,CTR ADV STUDY BOT,ALGAL BIOL LAB VARANASI 221005 UTTAR PRADESH INDIA BANARAS HINDU UNIV,CTR ADV STUDY BOT,ALGAL BIOL LAB VARANASI 221005 UTTAR PRADESH INDIA
Titolo Testata:
Journal of General and Applied Microbiology
fascicolo: 6, volume: 39, anno: 1993,
pagine: 529 - 540
SICI:
0022-1260(1993)39:6<529:PABOAA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
DUNALIELLA-ACIDOPHILA; CADMIUM TOXICITY; PH; ALGA; PHOTOSYNTHESIS; ASSAY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
P.K. Rai et al., "PHYSIOLOGICAL AND BIOCHEMICAL-STUDIES ON AN ACID-TOLERANT CHLORELLA-VULGARIS UNDER COPPER STRESS", Journal of General and Applied Microbiology, 39(6), 1993, pp. 529-540

Abstract

This study compared the growth, photosynthesis, electron transport, ATP content, NO3- and NH4+ uptake, Na+ and K+ loss, nitrate reductase and ATPase activities of an acid-tolerant strain and a wild-type strainof Chlorella vulgaris exposed to Cu at varied pHs (pH 6.8, 5.0, 4.0 and 3.5). A general reduction in growth, NH4+ uptake, photosynthesis and nitrate reductase activity of both the strains was noticed at decreasing pH. In contrast, the acid-tolerant strain depicted an increased NO3- uptake, insignificant Na+, K+ loss and superactive ATPase at decreasing pH. Both pH and Cu produced a non-competitive inhibition of NO3-uptake. An increase in V-max of ATPase of acid-tolerant Chlorella andinhibition of the V-max of its wild-type strain at decreasing pH was noticed. Though the magnitude of Cu toxicity was significantly low in tolerant strain, a significant negative correlation (r=-0.99, p<0.01) of Cu uptake with acid pH was noticed. The acid-tolerant Chlorella wasless sensitive to Cu and physiologically more efficient than the wildtype. Presence of a superactive ATPase and change in membrane permeability are considered responsible for acid tolerance in Chlorella.

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Documento generato il 22/10/20 alle ore 09:15:53