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Effects of cadmium on ultrastructure and antioxidative defense system in hyperaccumulator and non-hyperaccumulator ecotypes of Sedum alfredii Hance.
J Hazard Mater. 2008 Aug 15; 156(1-3):387-97.JH

Abstract

Plant growth, ultrastructural and antioxidant adaptations and glutathione biosynthesis in Cd-hyperaccumulating ecotype Sedum alfredii Hance (HE) countering high Cd environment were investigated and compared with its non Cd-hyperaccumulating ecotype (NHE). Cadmium exposure resulted in significant ultrastructural changes in root meristem and leaf mesophyll cells of S. alfredii, but damage was more pronounced in NHE even when Cd concentrations were one-tenth of those applied to HE. Cadmium stress damaged chloroplasts causing imbalanced lamellae formation coupled with early leaf senescence. Histochemical results revealed that glutathione (GSH) biosynthesis inhibition led to overproduction of hydrogen peroxide (H(2)O(2)) and superoxide radical (O(2)(*-)) in HE but not in NHE. Differences were noted in both HE and NHE for catalase (CAT), guaiacol peroxidase (GPX), ascorbate peroxidase (APX) and glutathione reductase (GR) activities under various Cd stress levels. No relationship was found between antioxidative defense capacity including activities of superoxide dismutase (SOD), CAT, GPX, APX and GR as well as ascorbic acid (AsA) contents and Cd tolerance in the two ecotypes of S. alfredii. The GSH biosynthesis induction in root and shoot exposed to elevated Cd conditions may be involved in Cd tolerance and hyperaccumulation in HE of S. alfredii H.

Authors+Show Affiliations

Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, Zhejiang University, Hangzhou, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18242844

Citation

Jin, Xiaofen, et al. "Effects of Cadmium On Ultrastructure and Antioxidative Defense System in Hyperaccumulator and Non-hyperaccumulator Ecotypes of Sedum Alfredii Hance." Journal of Hazardous Materials, vol. 156, no. 1-3, 2008, pp. 387-97.
Jin X, Yang X, Islam E, et al. Effects of cadmium on ultrastructure and antioxidative defense system in hyperaccumulator and non-hyperaccumulator ecotypes of Sedum alfredii Hance. J Hazard Mater. 2008;156(1-3):387-97.
Jin, X., Yang, X., Islam, E., Liu, D., & Mahmood, Q. (2008). Effects of cadmium on ultrastructure and antioxidative defense system in hyperaccumulator and non-hyperaccumulator ecotypes of Sedum alfredii Hance. Journal of Hazardous Materials, 156(1-3), 387-97. https://doi.org/10.1016/j.jhazmat.2007.12.064
Jin X, et al. Effects of Cadmium On Ultrastructure and Antioxidative Defense System in Hyperaccumulator and Non-hyperaccumulator Ecotypes of Sedum Alfredii Hance. J Hazard Mater. 2008 Aug 15;156(1-3):387-97. PubMed PMID: 18242844.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of cadmium on ultrastructure and antioxidative defense system in hyperaccumulator and non-hyperaccumulator ecotypes of Sedum alfredii Hance. AU - Jin,Xiaofen, AU - Yang,Xiaoe, AU - Islam,Ejazul, AU - Liu,Dan, AU - Mahmood,Qaisar, Y1 - 2008/02/01/ PY - 2007/08/23/received PY - 2007/12/10/revised PY - 2007/12/10/accepted PY - 2008/2/5/pubmed PY - 2008/8/8/medline PY - 2008/2/5/entrez SP - 387 EP - 97 JF - Journal of hazardous materials JO - J Hazard Mater VL - 156 IS - 1-3 N2 - Plant growth, ultrastructural and antioxidant adaptations and glutathione biosynthesis in Cd-hyperaccumulating ecotype Sedum alfredii Hance (HE) countering high Cd environment were investigated and compared with its non Cd-hyperaccumulating ecotype (NHE). Cadmium exposure resulted in significant ultrastructural changes in root meristem and leaf mesophyll cells of S. alfredii, but damage was more pronounced in NHE even when Cd concentrations were one-tenth of those applied to HE. Cadmium stress damaged chloroplasts causing imbalanced lamellae formation coupled with early leaf senescence. Histochemical results revealed that glutathione (GSH) biosynthesis inhibition led to overproduction of hydrogen peroxide (H(2)O(2)) and superoxide radical (O(2)(*-)) in HE but not in NHE. Differences were noted in both HE and NHE for catalase (CAT), guaiacol peroxidase (GPX), ascorbate peroxidase (APX) and glutathione reductase (GR) activities under various Cd stress levels. No relationship was found between antioxidative defense capacity including activities of superoxide dismutase (SOD), CAT, GPX, APX and GR as well as ascorbic acid (AsA) contents and Cd tolerance in the two ecotypes of S. alfredii. The GSH biosynthesis induction in root and shoot exposed to elevated Cd conditions may be involved in Cd tolerance and hyperaccumulation in HE of S. alfredii H. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/18242844/Effects_of_cadmium_on_ultrastructure_and_antioxidative_defense_system_in_hyperaccumulator_and_non_hyperaccumulator_ecotypes_of_Sedum_alfredii_Hance_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)01783-9 DB - PRIME DP - Unbound Medicine ER -