Cd-induced difference in root characteristics along root apex contributes to variation in Cd uptake and accumulation between two contrasting ecotypes of Sedum alfredii

Chemosphere ◽  
2020 ◽  
Vol 243 ◽  
pp. 125290 ◽  
Author(s):  
Qi Tao ◽  
Yuankun Liu ◽  
Meng Li ◽  
Jinxing Li ◽  
Jipeng Luo ◽  
...  
Keyword(s):  
Root Apex ◽  
Sedum Alfredii ◽  
Root Characteristics ◽  
Cd Uptake ◽  
Cd Uptake And Accumulation

Interaction of silicon and cadmium in Brassica juncea and Brassica napus

Biologia ◽  
2012 ◽  
Vol 67 (3) ◽  
Author(s):  
Zuzana Vatehová ◽  
Karin Kollárová ◽  
Ivan Zelko ◽  
Danica Richterová-Kučerová ◽  
Marek Bujdoš ◽  
...  
Keyword(s):  
Lateral Roots ◽  
Root Apex ◽  
Brassica Species ◽  
Inhibitory Effects ◽  
Cd Uptake ◽  
Primary Roots ◽  
Suberin Lamellae ◽  
Root And Shoot Growth ◽  
The Impact ◽  
Si Addition

AbstractThe objective of this study was to determine the effect of silicon (Si) and cadmium (Cd) on root and shoot growth and Cd uptake in two hydroponically cultivated Brassica species (B. juncea (L.) Czern. cv. Vitasso and B. napus L. cv. Atlantic). Both species are potentially usable for phytoextraction. Inhibitory effects of Cd on root elongation were diminished by the impact of Si. Primary roots elongation in the presence of Cd + Si compared with Cd was stronger and the number of lateral roots was lower in B. juncea than in B. napus. Cd content per plant was higher in B. napus roots and shoots compared with B. juncea. Suberin lamellae were formed closer to the root apex in Cd + Si than in Cd treated plants and this effect was stronger in B. napus than in B. juncea. Accelerated maturation of endodermis was associated with reduced Cd uptake. Cd decreased the content of chlorophylls and carotenoids in both species, but Si addition positively influenced the content of photosynthetic pigments which was higher in B. napus than in B. juncea. Si enhanced more substantially translocation of Cd into the shoot of B. napus than of B. juncea. Based on our results B. napus seems to be more suitable for Cd phytoextraction than B. juncea because these plants produce more biomass and accumulate higher amount of Cd. The protective effect of Si on Cd treated Brassica plants could be attributed to more extensive development of suberin lamellae in endodermis.

scholarly journals Ascorbate-Mediated Modulation of Cadmium Stress Responses: Reactive Oxygen Species and Redox Status in Brassica napus

2020 ◽  
Vol 11 ◽  
Author(s):  
Ha-il Jung ◽  
Bok-Rye Lee ◽  
Mi-Jin Chae ◽  
Eun-Jin Lee ◽  
Tae-Gu Lee ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Brassica Napus ◽  
Oilseed Rape ◽  
Antioxidant Defense ◽  
Redox Status ◽  
Oxygen Species ◽  
Cd Uptake ◽  
Defense Systems ◽  
Cd Uptake And Accumulation

The role of ascorbate (AsA) in antioxidant defense system-associated resistance to cadmium (Cd) in oilseed rape plants has not yet been clearly demonstrated. The present study investigated the critical role of exogenous AsA on the physiological and biochemical responses of reactive oxygen species (ROS) and antioxidant scavenging defense systems in oilseed rape (Brassica napus L. cv. Tammi) seedlings exposed to Cd. Cd (10 μM) treatment led to significant reductions in plant growth; increases in the levels of superoxide anion radical, hydrogen peroxide, and malondialdehyde; and increases in Cd uptake and accumulation by the roots and shoots in hydroponically grown 10-day-old seedlings. Moreover, it reduced AsA content and AsA redox ratios, which have been correlated with reductions in glutathione (GSH) and/or nicotinamide adenine dinucleotide phosphate (NADPH) redox status. However, exogenously applying AsA to Cd-exposed seedlings decreased Cd-induced ROS, improved antioxidant defense systems by increasing AsA, GSH, and NADPH contents, and increased Cd uptake and accumulation in both roots and shoots of the plants. These results provided evidence that the enhancement in AsA redox status can be linked to an increase in the GSH and/or NADPH redox ratios through the induction of the AsA–GSH–NADPH cycle. Thus, these results suggest that exogenous AsA application to oilseed rape seedlings under Cd stress might alleviate the overall Cd toxicity by regulating the homeostasis of the AsA–GSH–NADPH cycle, which reestablishes the steady-state cellular redox status.

The role of Ca pathway in Cd uptake and translocation by the hyperaccumulator Sedum alfredii

2010 ◽  
Vol 183 (1-3) ◽  
pp. 22-28 ◽  
Author(s):  
Lingli Lu ◽  
Shengke Tian ◽  
Min Zhang ◽  
Jie Zhang ◽  
Xiaoe Yang ◽  
...  
Keyword(s):  
Sedum Alfredii ◽  
Cd Uptake

scholarly journals Effects of Magnetically Treated Sedum Alfredii Seeds On The Dissolved Organic Matter Characteristics of Cd-Contaminated Soil During Phytoextraction

2021 ◽  
Author(s):  
Youjun Tang ◽  
Shuaizhi Ji ◽  
Dan Chen ◽  
Jiawei Wang ◽  
Min Cao ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Control Sample ◽  
Water Soluble ◽  
Sedum Alfredii ◽  
Uptake Capacity ◽  
Cd Uptake ◽  
Extraction Capacity ◽  
Growth Status ◽  
Determining Factors

Abstract The effects of magnetic field treatments on the two determining factors of phytoremediation, growth status and element uptake capacity, of Sedum alfredii have been thoroughly studied; however, minimal studies have been performed to determine the influence of the Cd hyperaccumulator Sedum alfredii, grown from magnetically treated seeds, on the dissolved organic matter (DOM) characteristics in its rhizosphere. A series of pot experiments were conducted to evaluate the variations in the DOM concentration and fractionations in the rhizosphere of S. alfredii treated with external magnetic fields. Compared with the untreated seeds, S. alfredii grown from magnetically treated seeds excreted more DOM in its rhizosphere. Additionally, the hydrophilic DOM fractionation proportion, which presented a greater capacity to mobilize Cd in the soil, increased from 42.7 % in the control sample to 47.2 % in the 150 mT magnetically treated S. alfredii sample. The water-soluble and exchangeable forms of Cd (extracted using deionized water and NH4NO3, respectively) in the rhizosphere of the magnetically treated S. alfredii were significantly lower than those of the control sample. Furthermore, the Cd extraction capacity of DOM from the rhizosphere of the magnetically treated S. alfredii was greater than that of the control sample, thereby increasing the Cd uptake ability of the magnetically treated species. These results suggest that the secretion of large amounts of DOM, especially acid and hydrophilic fractionations, is an essential mechanism of magnetically treated S. alfredii to mobilize Cd in the soil.

scholarly journals Exogenous Glycinebetaine Promotes Soil Cadmium Uptake by Edible Amaranth Grown during Subtropical Hot Season

2018 ◽  
Vol 15 (9) ◽  
pp. 1794 ◽  
Author(s):  
Wei-Qing Yao ◽  
Yong-Kang Lei ◽  
Ping Yang ◽  
Qu-Sheng Li ◽  
Li-Li Wang ◽  
...  
Keyword(s):  
Soluble Sugar ◽  
Translocation Factor ◽  
Control Group ◽  
Cd Uptake ◽  
Effective Measure ◽  
Leaf Chlorophyll ◽  
Hot Season ◽  
Cd Translocation ◽  
Cd Uptake And Accumulation ◽  
Soil Cd

Exogenous glycinebetaine treatment is an effective measure for preventing crops from being exposed to drought and high temperature; however, the effects of this approach on the soil Cd uptake and accumulation by crops remain unclear. Pot experiments were conducted in this study to analyze the effect of glycinebetaine on the soil Cd uptake and accumulation by edible amaranth cultivated in Cd-contaminated soil. Results revealed that after exogenous glycinebetaine treatment on amaranth leaves during the vigorous growth period, the plant biomass, the Cd concentrations in the roots and shoots, and the Cd translocation factor (TF) were significantly higher than those of the control group. The highest Cd concentrations in the roots and shoots and the TF were higher by 91%, 96% and 23.8%, respectively, than the corresponding values in the control group. In addition, exogenous glycinebetaine treatment significantly increased leaf chlorophyll content and promoted the photosynthesis of edible amaranth. Consequently, the contents of soluble sugar, dissolved organic carbon, and low-molecular-weight organic acids significantly increased in the rhizosphere, resulting in Cd mobilization. Significant positive correlations were observed among the contents of leaf chlorophyll, Mg, Fe, pectin and Ca. Given that Cd shares absorption and translocation channels with these elements, we speculated that the increased leaf chlorophyll and pectin contents promoted the absorption and accumulation of Mg, Fe and Ca, which further promoted the absorption and translocation of Cd. These results indicated that exogenous glycinebetaine treatment during hot season would aggravate the health risks of crops grown in Cd-contaminated soils.

Oxalate secretion from the root apex of Sedum alfredii contributes to hyperaccumulation of Cd

2015 ◽  
Vol 398 (1-2) ◽  
pp. 139-152 ◽  
Author(s):  
Qi Tao ◽  
Dandi Hou ◽  
Xiaoe Yang ◽  
Tingqiang Li
Keyword(s):  
Root Apex ◽  
Sedum Alfredii ◽  
Oxalate Secretion
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