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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 4    April 2016

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Response of enzymatic and non-enzymatic antioxidant defense systems of Polygonum hydropiper to Mn stress
YANG Xian-jun(杨贤均)1,DENG Dong-mei(邓冬梅)2, LIU Ke-hui(刘可慧)3, YU Fang-ming(于方明)2

1. Department of City Construction,Shaoyang University, Shaoyang 422004,China;
2.College of Resource and Environment, GuangxiNormalUniversity, Guilin 541004, China;
3.College of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China

Abstract:The response of enzyme and non-enzymatic antioxidants of Mnhyperaccumuator,Polygonumhydropiper (P. hydropiper), to Mn stress was studied using hydroponics culture experiments to explore the mechanism of Mntolerance in this species. Results showed that both chlorophyll and carotenoid contents significantly (p<0.05) decreased with increasing Mn treatment levels (0, 0.5, 1, 2, 4, and 8 mg/L) in hydroponics. The concentrations of malondialdehyde (MDA) and hydrogen peroxide (H2O2) in the root and shoot of P. hydropiper were accumulated under Mn stress.Meanwhile, the anti-oxidative functions of several important enzymes, including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and peroxidase (POD) in plants were stimulated by Mn spike in leaves and roots, especially at low Mn stress; while sulfhydryl group (—SH) and glutathion (GSH) were likely involved in Mn detoxification of P. hydropiper under high Mn stress.

 

Key words: Polygonumhydropiper; hyperaccumulation; enzymatic antioxidative defense; non-enzymatic antioxidative defense

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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