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Titolo:
Physiological responses to oxidative and heavy metal stress in seedlings of rice paddy, Oryza sativa L.
Autore:
Yu, G; Wang, G; He, C; Bai, J;
Indirizzi:
Chinese Acad Sci, Changchun Inst Geog, Lab Wetland Proc & Environm, Changchun 130021, Peoples R China Chinese Acad Sci Changchun Peoples R China 130021 30021, Peoples R China
Titolo Testata:
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
fascicolo: 4, volume: 65, anno: 2000,
pagine: 514 - 521
SICI:
0007-4861(200010)65:4<514:PRTOAH>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIOSYNTHESIS; PLANTS; OXYGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Yu, G Chinese Acad Sci, Changchun Inst Geog, Lab Wetland Proc & Environm, Changchun 130021, Peoples R China Chinese Acad Sci Changchun Peoples R China 130021 Peoples R China
Citazione:
G. Yu et al., "Physiological responses to oxidative and heavy metal stress in seedlings of rice paddy, Oryza sativa L.", B ENVIR CON, 65(4), 2000, pp. 514-521

Abstract

Organisms living under pollution stress varied responses, from changes in gross morphology to changes in biochemistry. Plants in particular have evolved diverse ways of responding to adverse changes in their environment. Plants overcome severe environmental stress by developing tolerance or adaptation through physiological and biochemistry mechanisms (Verkleij and Schat, 1990; Yu, 1992). Plants are also known to develop genetic resistance to specific pollutants have been identified (Scandalios, 1990; Duan, 1996). Oxidative stress is known to be generated by a number of environmental factors including light, temperature, water, mineral deficiency, toxic metals and air pollutants such as O-3, SO2 and NOx (Hendry, 1994), Furthermore, plants after reacting with oxygen can exhibit a broad ranged of physiological responses including changes in gene expression (Elstner and Osswald, 1994). Heavy metals as well as oxidative agents are known to induce adaptive responsesto chemical mutagens and heavy metals in plant cells(Yang et al., 1995; Panda et al., 1997). How ever, the physio-ecological mechanisms underlying the metallo- or oxidative adaptive responses are not very clear. In order to improve our understanding of the physiological basis of the adaptive response, this article studied the induction or inhibition of antioxidant enzyme,thiols, proteins and lipid peroxidation(LP) by oxidative stress compared with heavy metal stress, investigated in germinating seeds of rice paddy, Oryza sativa L.. Of the two oxidative agents used, hydrogen peroxide (H2O2) generated extracellular oxidative stress, whereas paraquat(PQ), a redox agent, served as the source of intracellular oxidative stress that mediated thetransfer of electron from NADPH or NADH to O-2, generating a flux of superoxide radical through redox cycling.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 09:41:25