The Effect of Aluminium on Oxidative Stress-Related Enzyme Activity in Two Clover Species

Authors : Fayza A FAHEED

Pages : 345-352

View : 14 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The impact of aluminium insert ignore into journalissuearticles values(Al); stress on the production of hydrogen peroxide and on the activity of antioxidant enzymes involved in oxidative metabolism, such as ascorbate peroxidase insert ignore into journalissuearticles values(APX);, peroxidase insert ignore into journalissuearticles values(POD);, and catalase insert ignore into journalissuearticles values(CAT);, were studied in seedlings of 2 clover species insert ignore into journalissuearticles values(Trifolium alexandrinum L. and Medicago sativa L.);. A uniform decrease in germination and root elongation were detected as the primary signs of Al injury. A significant increase in hydrogen peroxide content was also related to an increase in Al uptake by the roots of the 2 clover species, especially at relatively highly toxic Al concentrations insert ignore into journalissuearticles values(2-6 mM); for 7 days. APX-, POD-, CAT-, and H2O2-consuming enzymes were activated and followed similar patterns of expression in each species, exhibiting a relationship between their elevated activity and inhibition of root growth. Furthermore, it was shown that clover roots of the Al-tolerant insert ignore into journalissuearticles values(M. sativa); species accumulated more Al than the Al-sensitive insert ignore into journalissuearticles values(T. alexandrinum); cultivar during long-term Al treatment. Proline content increased more in M. sativa than in T. alexandrinum, especially at relatively highly toxic Al levels after 7 days of exposure.
Keywords : Aluminium, Egyptian clover berseem, antioxidant enzymes, root growth, Al uptake, proline