Phenolics metabolism and lignin synthesis in root suspension cultures of Panax ginseng in response to copper stress

Ali, Mohammad; Singh, Nisha; Shohael, Abdullah Mohammad; Hahn, Eun-Joo; Paek, Kee-Yoeup

doi:10.1016/j.plantsci.2006.03.005

Cited by 197 publications

(104 citation statements)

References 47 publications

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“…This conclusion can also be supported by results showing even decreased of chamomile root soluble phenolics in nickel excess (Kováčik, submitted results). In line with our results, Ali et al (2006) observed higher PAL activity and total phenols in root suspension cultures of Panax ginseng, comparing 40th and 20th days of exposure to Cu doses up to 50 lM. In fronds of the fern Azolla imbricata, Dai et al (2006) observed that Cd at a dose of 4.45 lM increased PAL activity up to the 5th day of exposure, but then it decreased up to the 9th day of exposure.…”

Section: Discussionsupporting

confidence: 89%

“…Its enhanced activity could therefore be assumed in stressed plant tissue. Recently, Ali et al (2006) recorded a stimulatory effect of Cu on PAL in Panax ginseng and the influence of Cd on PAL activity has been studied in fronds of Azolla imbricata (Dai et al, 2006). Notwithstanding, data related to cadmium effect on PAL activity under Cd stress and the comparison of metals with different redox properties is scarce.…”

Section: Introductionmentioning

confidence: 99%

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Physiological responses of Matricaria chamomilla to cadmium and copper excess

Kováčik

Bačkor

Kaduková

2008

Environmental Toxicology

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Physiological responses of Matricaria chamomilla plants exposed to cadmium (Cd) and copper (Cu) excess (3, 60, and 120 lM for 7 days) with special emphasis on phenolic metabolism were studied. Cu at 120 lM reduced chamomile growth, especially in the roots where it was more abundant than Cd. Notwithstanding the low leaf Cu amount (37.5 lg g 21 DW) in comparison with Cd (237.8 lg g 21 DW) at 120 lM, it caused reduction of biomass accumulation, F v /F m ratio and soluble proteins. In combination with high accumulation of phenolics, strong reduction of proteins and high GPX activity in the roots, this supports severe redox Cu properties. In terms of leaf phenylalanine ammonia-lyase (PAL) activity, it seems that Cd had a stimulatory effect during the course of the experiment, whereas Cu was found to stimulate it after 7-day exposure. The opposite trend was visible in the roots, where Cd had a stimulatory effect at high doses but Cu mainly at the highest dose. This supports the assumption of different PAL time dynamics under Cd and Cu excess. A dose of 60 and 120 lM Cu led to 2-and 3-times higher root lignin accumulation while the same Cd doses increased it by 33 and 68%, respectively. A Cu dose of 120 lM can be considered as limiting for chamomile growth under conditions of present research, while resistance to high Cd doses was confirmed. However, PAL and phenolics seemed to play an important role in detoxification of Cd-and Cu-induced oxidative stress. # 2008 Wiley Periodicals, Inc. Environ Toxicol 23: 123-130, 2008

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Kováčik

Bačkor

Kaduková

2008

Environmental Toxicology

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“…Phenolic compounds increased significantly under Mn toxicity in the two populations; in fact the phenolic metabolism can be induced by multiple stresses such as UV, pathogen attack, high visible light irradiation and heavy metal due to the antioxidant properties (Rice-Evans et al 1997). Polyphenol oxidases are widely distributed in the plant and proposed to regulate the redox state of phenolic compounds (Ali et al 2006). PPO activity increased in our study suggesting its defensive response against Mn stress in the two populations (Fig.…”

Section: Discussionmentioning

confidence: 52%

Effect of Mn toxicity on morphological and physiological changes in two Populus cathayana populations originating from different habitats

Lei

Chen

Tian

et al. 2007

Trees

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The cuttings of Populus cathayana were exposed to four different manganese (Mn) concentrations (0, 0.1, 0.5 and 1 mM) in a greenhouse to investigate the toxicity of Mn and the detoxifying responses of woody plants. Two contrasting populations of P. cathayana, which were from wet and dry climate regions in western China, respectively, were examined in our study. The results showed that high concentration of Mn caused significant decrease in shoot height, biomass accumulation, and leaf number and leaf areas. Injuries to the anatomical features of leaves were also found as the reduced thickness of palisade and spongy parenchyma, the decreased density in the conducting tissue and the collapse and split in the meristematic tissue in the central vein. Moreover, Mn treatments caused the accumulation of hydrogen peroxide (H 2 O 2 ), and then resulted in oxidative stress indicated by the oxidation of proteins and DNA. Many physiological responses were employed to cope with the toxicity of Mn, including the increase in the contents of non-protein thiol (NP-SH), phytochelatins (PCs) and phenolics compounds and the stimulated activities of guaiacol peroxidase (GPX) and polyphenol oxidase (PPO) for the chelation of Mn and for the antioxidation of reactive oxygen species. The population from dry climate habitat showed a lower leaf concentration of Mn, higher contents of the chelators, and higher activities of GPX and PPO than did the wet climate population at the same Mn treatment, thereby possessing a superior Mn tolerance. In both populations, most of the Mn was accumulated in the shoot, which is favorable regarding phytoremediation.

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“…6) An increase in lignin content has already been reported in Cu 2þ -treated plants species, e.g. in Capsicum annuum [14] Raphanus sativus [8], Glycine max [32] and Panax ginseng [2]. The polymerization of lignin precursors is currently known to be catalysed by peroxidases and by laccases, which are Cu-containing glycoproteins [5,14,32,58].…”

Section: Influence Of Cu 2þ Excess On Cell Viability Hormonal Statusmentioning

confidence: 99%

Response to copper excess in Arabidopsis thaliana: Impact on the root system architecture, hormone distribution, lignin accumulation and mineral profile

Lequeux

Hermans

Lutts

et al. 2010

Plant Physiology and Biochemistry

339

196

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Phenolics metabolism and lignin synthesis in root suspension cultures of Panax ginseng in response to copper stress

Cited by 197 publications

References 47 publications

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Effect of Mn toxicity on morphological and physiological changes in two Populus cathayana populations originating from different habitats

Response to copper excess in Arabidopsis thaliana: Impact on the root system architecture, hormone distribution, lignin accumulation and mineral profile

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