Nitrogen fertilizer enhances zinc and cadmium uptake by hyperaccumulator Sedum alfredii Hance

Lin, Ziwen; Chun-ying, Dou; Li, Yongfu; Wang, Hailong; Niazi, Nabeel Khan; Zhang, Shaobo; Liu, Dan; Zhao, Keli; Fu, Weijun; Ye, Zhengqian

doi:10.1007/s11368-019-02405-4

Cited by 32 publications

(20 citation statements)

References 61 publications

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“…Thus, in the present study, a series of nitrate concentrations (N1-N5 levels), with or without Cd stress, were applied to sweet sorghum. In accordance with the fact that low levels of N decrease plant biomass accumulation through the effect of limited nutrients (Lin et al 2020), the lowest N1 level had the smallest dry weight in the aboveground organs (leaves and stems + sheaths) ( Fig. 1A and B).…”

Section: Effects Of Nitrate On CD Accumulation In Sweet Sorghumsupporting

confidence: 77%

“…In accordance with the fact that low levels of N decrease plant biomass accumulation through the effect of limited nutrients (Lin et al . 2020), the lowest N1 level had the smallest dry weight in the aboveground organs (leaves and stems + sheaths) (Fig. 1A and B).…”

Section: Resultsmentioning

confidence: 98%

“…Acceleration of root-to-shoot Cd translocation is beneficial for higher efficiency of phytoextraction. Lin et al (2020) showed root-toshoot Cd translocation increased with an increase of N and decreased as the level of N was further increased in Sedum alfredii. Zeng et al (2020) indicated that physiologically acidic N, such as NH 4 Cl under 5 mgÁkg −1 Cd stress, significantly increased root-to-shoot Cd translocation, whereas physiologically alkaline N, such as NaNO 3 and Ca(NO 3 ) 2 under 10 mgÁkg −1 Cd stress, significantly increased Cd translocation in rape.…”

Section: Effects Of Nitrate On CD Translocation and Subcellular Distrmentioning

confidence: 91%

“…Efficient phytoextraction of Cd pollutants requires high Cd concentrations or large plant biomass or both in shoots. Currently, Cd hyperaccumulators such as Solanum nigrum L. (Yang et al 2019), Noccaea caerulescens L. (Rees et al 2020) and Sedum alfredii L. (Lin et al 2020) discovered to date generally have low biomass and slow growth, thus limiting the efficiency of phytoextraction, even though they can tolerate high Cd concentrations. Thus, the use of high biomass plants such as sorghum (Sorghum bicolor L. Moench) for phytoextraction is increasingly attractive (Akbudak et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of cadmium accumulation in sweet sorghum as affected by nitrate

et al. 2020

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• The Cadmium (Cd)-polluted soils are is an increasing concern worldwide. Phytoextraction of Cd pollutants by high biomass plants, such as sweet sorghum, is considered an environmentally-friendly, cost-effective and sustainable strategy for remediating this problem. Nitrogen (N) is a macronutrient essential for plant growth, development and stress resistance. Nevertheless, how nitrate, as an important form of N, affects Cd uptake, translocation and accumulation in sweet sorghum is still unclear. • In the present study, a series of nitrate levels (N1, 0.5 mM; N2, 2 mM; N3, 4 mM; N4, 8 mM and N5, 16 mM) with or without added 5 μM CdCl 2 treatment in sweet sorghum was investigated hydroponically. • The results indicate that Cd accumulation in the aboveground parts of sweet sorghum was enhanced by optimum nitrate supply, resulting from both increased dry weight and Cd concentration. Although root-to-shoot Cd translocation was not enhanced by increased nitrate, some Cd was transferred from cell walls to vacuoles in leaves. Intriguingly, expression levels of Cd uptake and transport genes, SbNramp1, SbNram-p5 and SbHMA3, were not closely related to increased Cd as affected by nitrate supply. The expression of SbNRT1.1B in relation to nitrate transport showed an inverted 'U' shape with increasing nitrate levels under Cd stress, which was in agreement with trends in Cd concentration changes in aboveground tissues. • Based on the aforementioned results, nitrate might regulate Cd uptake and accumulation through expression of SbNRT1.1B rather than SbNramp1, SbNramp5 or SbHMA3, the well-documented genes related to Cd uptake and transport in sweet sorghum.

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Section: Effects Of Nitrate On CD Accumulation In Sweet Sorghumsupporting

confidence: 77%

Section: Resultsmentioning

confidence: 98%

Section: Effects Of Nitrate On CD Translocation and Subcellular Distrmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Enhancement of cadmium accumulation in sweet sorghum as affected by nitrate

et al. 2020

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“…Although the utilization of some organic modifiers such as biochar reduces the mobility of heavy metals, the addition of modifiers such as compost and nitrogen fertilizers increases the availability and accumulation of heavy metals in plants. 10 They increase the biomass production and uptake of heavy metals by affecting the physiological and morphological characteristics of plants, 11 increasing soil fertility, and improving its physical properties. 5…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Uptake of Salty Soils by Ornamental Sunflower, Using Cow Manure and Biosolids: A Case Study in Alborz city, Iran

Yazdanbakhsh

Alavi

Valadabadi

et al. 2020

Air, Soil and Water Research

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Heavy metals are among the most critical environmental pollutants close to industrial areas. One example is the cultivated fields in the south of Alborz industrial city in Iran, which is irrigated by treated industrial wastewater. It is contaminated by heavy metals and irrigation with wastewater treatment plants effluent, which made it salty. In this study, the application of 2 amendments, biosolids and cow manure, in improving the heavy metal accumulation in the ornamental sunflower from these types of soils was investigated. A greenhouse experiment using a completely randomized design with 4 replications and applying cow manure and biosolids in 3 weight ratios (6%, 12%, 25%) was conducted to evaluate the efficiency of sunflower in removing Pb, Ni, and Zn from the soil. Adding the amendments increased the rate of germination by 50% to 176%. Although the simultaneous utilization of cow manure in high ratios with biosolids and cow manure with low biosolids decreased the sunflower survival, nonetheless, the simultaneous addition of these organic amendments could increase the survival rate in other treatments. Moreover, the plants’ biomass was increased by adding modifiers such as cow manure and biosolids. The results showed that in treatments with 2 modifiers, the remediation factor of Pb, Zn, and Ni has increased 83.7 to 95.5, 78.4 to 87.5, and 74.9 to 94.9, respectively, in comparison to the control one. Therefore, we conclude that adding biosolids and cow manure simultaneously could improve the ornamental sunflower ability to accumulate heavy metals.

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