Response of antioxidant enzymes in leaves and roots of Solanum nigrum L to cadmium stress

doi:10.7523/j.issn.2095-6134.2013.05.006

Abstract

Abstract: Cadmium (Cd) is one of the most toxic environmental pollutants for soils. The seedlings of S. nigrum were exposed to half-strength Hogland solution with 100 μmol/L CdCl₂ for 1-4 days, and the activity of antioxidant enzyme in leaves and roots was investigated. The results show that the contents of MDA and H₂O₂ increase in leaves and roots and the increase of MDA in leaves is larger than that in roots while the increase of H₂O₂ in roots is larger than that in leaves. Also, the activities of SOD, CAT, APX, and POD in leaves and roots are enhanced with prolonged Cd treatment. It is suggested that the H₂O₂ accumulation induced by Cd stress leads to oxidative stress and the increase of the oxitioxidant enzyme activity may be one of the mechanisms of Cd detoxification in S. nigrum. H₂O₂ in leaves may be scavenged by both CAT and APX while the H₂O₂ in roots may be mainly scavenged by APX.

Key words: cadmium, Solanum nigrum L, oxidative stress, antioxidant enzyme

CLC Number:

X171

SHI Pei-Li, ZHANG Yu-Xiu, CHAI Tuan-Yao. Response of antioxidant enzymes in leaves and roots of Solanum nigrum L to cadmium stress[J]. Journal of University of Chinese Academy of Sciences, 2013, 30(5): 608-612.

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