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- aggregation classification "A1".
- aggregation creator B88787.
- aggregation creator B88788.
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- aggregation date "1999".
- aggregation format "application/pdf".
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- aggregation isPartOf urn:issn:0022-0957.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Biology and Life Sciences".
- aggregation title "Tolerance to low temperature and paraquat-mediated oxidative stress in two maize genotypes".
- aggregation abstract "Tolerance to low temperature and paraquat-mediated oxidative stress was investigated in two Zea mays genotypes, VA36 and A619, grown at 25/22 degrees C and 16/14 degrees C for 50 d after germination. VA36, the tolerant genotype, showed an enhanced resistance to paraquat as compared to A619, the sensitive genotype, when grown at low temperature. In VA36, superoxide dismutase and ascorbate peroxidase activities increased during growth at both 25/22 degrees C or 16/14 degrees C. in A619, superoxide dismutase activity was similar in plants grown at both 16/14 degrees C or 25/22 degrees C. Ascorbate peroxidase activity was always significantly lower in plants grown at low temperature than in plants grown at 25/22 degrees C, The total ascorbate peroxidase activity was correlated with the cytosolic ascorbate peroxidase protein content in all but A619 plants grown at low temperature for 25 d. The isozyme pattern of SOD showed a higher abundance of MnSOD in VA36 than in A619 and of FeSOD in A619 compared to VA36. Growth at low temperature enhanced resistance to paraquat infiltration more in VA36 than in A619. SOD and APX activities were generally higher and more stable with the increase of paraquat concentration in VA36 than in A619. Damage indicated by F-v/F-m and ion leakage after paraquat infiltration were generally higher in plants grown at 25/22 degrees C than at 16/14 degrees C and higher in A619 than in VA36, However, no causal link is proved between the extent of damage and the increase of SOD and APX activities alone. It is suggested that tolerance to oxidative stress requires an integrated enhancement of the antioxidant system.".
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- aggregation endPage "532".
- aggregation issue "333".
- aggregation startPage "523".
- aggregation volume "50".
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