Alleviation of cadmium toxicity to tobacco (Nicotiana tabacum) by biofertilizers involves the changes of soil aggregates and bacterial communities

Wang, Meng; Duan, Shuhui; Zhou, Zhi; Chen, Shibao

doi:10.1016/j.ecoenv.2018.10.112

Cited by 21 publications

(9 citation statements)

References 36 publications

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“…The microbial taxa Nitrospira showed higher abundance in the rhizospheres of Arabidopsis halleri plants that were able to accumulate more Cd ( Muehe et al, 2015 ). The relative abundance of Nitr ospira decreased with the increase in Cd (II) concentration, and showed recovery if amendments were applied continuously to Cd-contaminated soil ( Wang et al, 2019a ; Shi et al, 2019 ; Wang et al, 2019b ). Therefore, the content of Nitrospira should be associated with changes in Cd concentration.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the future investigation on the distribution of Nitrospira and Nitrospirae between rhizosphere soil and bulk soil may provide more information for improving the Cd-resistance of wheat in Cd-polluted field. In addition, a variety of plant-growth regulators, such as inorganic amendments, proper fertilization, organic, silicon, and manure, are usually added to the soil to reduce the uptake of Cd by wheat and rice ( Rizwan et al, 2016 ; Zhang et al, 2018 ; Wang et al, 2019b ). Accordingly, how these plant-growth regulators shape the microbial communities between rhizosphere soil and bulk soil to regulate the solubility of Cd and reduce the wheat uptake should be investigated in future.…”

Section: Discussionmentioning

confidence: 99%

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Characterization and comparison of the bacterial communities of rhizosphere and bulk soils from cadmium-polluted wheat fields

Song

Pan

Dai

et al. 2020

PeerJ

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Cadmium pollution is becoming a serious problem due to its nondegradability and substantial negative influence on the normal growth of crops, thereby harming human health through the food chain. Rhizospheric bacteria play important roles in crop tolerance. However, there is little experimental evidence which demonstrates how various cadmium concentrations affect the bacterial community in wheat fields including rhizosphere microorganisms and nonrhizosphere (bulk) microorganisms. In this study, 16S rRNA amplicon sequencing technology was used to investigate bacterial communities in rhizosphere and bulk soils under different levels of pollution in terms of cadmium concentration. Both the richness and diversity of the rhizosphere microorganism community were higher under nonpolluted soil and very mild and mild cadmium-contaminated soils than compared with bulk soil, with a shift in community profile observed under severe cadmium pollution. Moreover, cadmium at various concentrations had greater influence on bacterial composition than for the nonpolluted site. In addition, redundancy analysis (RDA) and Spearman’s analysis elucidated the impact of exchangeable Cd and total Cd on bacterial community abundance and composition. This study suggests that cadmium imposes a distinct effect on bacterial community, both in bulk and rhizosphere soils of wheat fields. This study increases our understanding of how bacterial communities in wheat fields shaped under different concentrations of cadmium.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Characterization and comparison of the bacterial communities of rhizosphere and bulk soils from cadmium-polluted wheat fields

Song

Pan

Dai

et al. 2020

PeerJ

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“…Studies show that increases in CaCl 2 −Cd are beneficial for phytoremediation because Cd accumulation in plants generally depends on soil concentrations of available Cd, exposure time, and translocation ability within plants. 33 Film Mulching Increases Biomass and Cadmium Accumulation in Oil Sunflower. Oil sunflower is generally sown in spring (April to May) and harvested in autumn (August to September).…”

Section: ■ Resultsmentioning

confidence: 99%

“…The increase in CaCl 2 −Cd concentrations was beneficial for phytoremediation because heavy metal accumulation in plants generally depends on available heavy metal concentration, exposure time, and translocation ability within plants. 33,36,37 Film mulching significantly increased Cd concentrations in roots, stems, leaves, and disks of oil sunflower (Figure 2). The increases were associated with increases in available Cd concentrations in FM soil.…”

Section: ■ Resultsmentioning

confidence: 99%

Film Mulching Redistributes Soil Aggregates and Promotes Cadmium Availability and Phytoremediation Potential of Helianthus annuus Linn

Chen

Yang

et al. 2022

ACS Agric. Sci. Technol.

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Film mulching (FM) is commonly used in agricultural production, but whether it affects soil cadmium (Cd) availability and accumulation in oil sunflower has not been fully examined. Therefore, the effects of FM and non-FM treatments on those factors were investigated in a field experiment. Compared with nonfilm mulching (NFM) treatment, FM significantly increased oil sunflower root biomass by 49.5% and stem biomass by 62.8%. Film mulching also increased Cd concentrations in roots by 87.6%, stems by 258.9%, leaves by 236.5%, flower disks by 71.3%, shucks by 26.5%, and grains by 160.0%. Film mulching reduced soil pH (0.38 units) and organic matter content (26.4%) and increased available Cd concentration (23%). In FM, the grain size fraction (GSF) of macro-aggregates increased but that of micro-aggregates decreased. Film mulching also increased mean weight diameter (18%), geometric mean diameter (48%), and percentage of aggregates >0.25 mm (36.2%) under wet sieving, thereby promoting soil aggregate stability and resistance to erosion and farming practices.

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“…Specific species involved in Cd immobilization were modified after azolla incorporation. It has been reported that increased abundances of Chloroflexi were involved in immobilizing soil Cd 33 . Chloroflexi are photosynthetic bacteria that affect the stability of microflora/fauna communities by involving the cycling of iron and manganese 34 .…”

Section: Discussionmentioning

confidence: 99%

Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

Liu

Guo

et al. 2021

Sci Rep

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Cadmium (Cd) presents severe risks to human health and environments. The present study proposed a green option to reduce bioavailable Cd. Rice pot experiments were conducted under continuous flooding with three treatments (T1: intercropping azolla with rice; T2: incorporating azolla into soil before rice transplantation; CK: no azolla). The results showed that azolla incorporation reduced soluble Cd by 37% compared with the CK treatment, which may be explained by the decreased soil redox potential (Eh) (r = 0.867, P < 0.01). The higher relative abundance of Methylobacter observed in azolla incorporation treatment may account for dissolved organic carbon increase (r = 0.694; P < 0.05), and hence decreased the Cd availability for rice. Azolla incorporation increased the abundance of Nitrospira, indicating the potentially prominent role of nitrogen mineralization in increasing rice yields. Further, lower soluble Cd decreased the expression of OsNramp5, but increased OsHMA3 levels in rice roots, which decreased Cd accumulation in grains. Through these effects, azolla incorporation decreased Cd concentrations in rice grains by 80.3% and increased the production by 13.4%. The negligible amount of Cd absorbed by azolla would not increase the risk of long-term application. Thus, intercropping azolla with early rice and incorporating azolla into soil before late rice transplantation can contribute to safe production at large scales of double rice cultivation.

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Alleviation of cadmium toxicity to tobacco (Nicotiana tabacum) by biofertilizers involves the changes of soil aggregates and bacterial communities

Cited by 21 publications

References 36 publications

Characterization and comparison of the bacterial communities of rhizosphere and bulk soils from cadmium-polluted wheat fields

Characterization and comparison of the bacterial communities of rhizosphere and bulk soils from cadmium-polluted wheat fields

Film Mulching Redistributes Soil Aggregates and Promotes Cadmium Availability and Phytoremediation Potential of Helianthus annuus Linn

Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

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