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2022 ◽  
Vol 424 ◽  
pp. 127361
Author(s):  
Xiangqin Wang ◽  
Yanhong Du ◽  
Fangbai Li ◽  
Liping Fang ◽  
Tingting Pang ◽  
...  

2021 ◽  
Author(s):  
Yanwei Wang ◽  
Jing Sun ◽  
Chen Deng ◽  
Shouzhen Teng ◽  
Guoxin Chen ◽  
...  
Keyword(s):  

2021 ◽  
Vol 13 (18) ◽  
pp. 10307
Author(s):  
Abu Bakkar Siddique ◽  
Mohammad Mahmudur Rahman ◽  
Mohammad Rafiqul Islam ◽  
Muhammad Tahir Shehzad ◽  
Bibhash Nath ◽  
...  

This study investigated the impact of soil type and rice cultivars on variations in the iron plaque formation and cadmium (Cd) accumulation by different portions of rice seedlings under the influence of Fe amendment. The experiments were performed in pots under glasshouse conditions using two typical paddy soils. Rice seedlings were exposed to three concentrations of Cd (0, 1 and 3 mg kg−1 soil) and Fe (0, 1.0 and 2.0 g kg−1 soil). The results revealed that shoot biomass decreased by 12.2–23.2% in Quest and 12.8–30.8% in Langi in the Cd1.0 and Cd3.0 treatments, while shoot biomass increased by 11.2–19.5% in Quest and 26–43.3% in Langi in Fe1.0 and Fe2.0 as compared to the Fe control. The Cd concentration in the roots and shoots of rice seedlings were in the order of Langi cultivar > Quest cultivar, but the Fe concentration in rice tissues showed the reverse order. Fe plaque formations were promoted by Fe application, which was 7.8 and 10.4 times higher at 1 and 2 g kg−1 Fe applications compared to the control Fe treatment. The Quest cultivar exhibited 13% higher iron plaque formation capacity compared to the Langi cultivar in both soil types. These results indicate that enhanced iron plaque formation on the root surface was crucial to reduce the Cd concentration in rice plants, which could be an effective strategy to regulate grain Cd accumulation in rice plants.


2021 ◽  
Author(s):  
Zhao-Feng Yuan ◽  
Tong-Yao Pu ◽  
Chen-Yu Jin ◽  
Wei-Jia Feng ◽  
Jia-Yue Wang ◽  
...  

Abstract Arsenic (As) pollution in paddy fields is a major threat to rice safety. Existing As remediation techniques are costly, require external chemical addition and degrade soil properties. Here, we report the use of plastic tubes as a recyclable tool to precisely extract As from contaminated soils. Following insertion into flooded paddy soils, polyethylene (PE) tube walls were covered by thin but massive Fe coatings of 76.9-367 mg Fe m-2 in 2 weeks, which adsorbed significant amounts of As as well as lead and antimony. The formation of tube-wall Fe oxides was driven by local Fe-oxidizing bacteria with oxygen produced by oxygenic phototrophs (e.g., Cyanobacteria) or diffused from air through the tube wall. The tubes with As-bound Fe oxides can be easily separated from soil and then recycled. We tested the As removal efficiency in a pilot experiment to remove As from ~ 20 cm depth / 80 kg soils in a two-year experiment and achieved an overall efficiency of 152 mg As m-2 soil year-1. The As accumulated in rice tissues was significantly decreased in the treatment. This work provides a low-cost and sustainable soil remediation method for the targeted removal of As from soils and a useful tool for the study and management of the biogeochemical Fe cycle in paddy soils.


2021 ◽  
Vol 12 ◽  
Author(s):  
Yusuke Kakei ◽  
Hiroshi Masuda ◽  
Naoko K. Nishizawa ◽  
Hiroyuki Hattori ◽  
May Sann Aung

Iron (Fe) excess is a major constraint on crop production in flooded acidic soils, particularly in rice cultivation. Under Fe excess, plants activate a complex mechanism and network regulating Fe exclusion by roots and isolation in various tissues. In rice, the transcription factors and cis-regulatory elements (CREs) that regulate Fe excess response mechanisms remain largely elusive. We previously reported comprehensive microarray analyses of several rice tissues in response to various levels of Fe excess stress. In this study, we further explored novel CREs and promoter structures in rice using bioinformatics approaches with this microarray data. We first performed network analyses to predict Fe excess-related CREs through the categorization of the gene expression patterns of Fe excess-responsive transcriptional regulons, and found four major expression clusters: Fe storage type, Fe chelator type, Fe uptake type, and WRKY and other co-expression type. Next, we explored CREs within these four clusters of gene expression types using a machine-learning method called microarray-associated motif analyzer (MAMA), which we previously established. Through a comprehensive bioinformatics approach, we identified a total of 560 CRE candidates extracted by MAMA analyses and 42 important conserved sequences of CREs directly related to the Fe excess response in various rice tissues. We explored several novel cis-elements as candidate Fe excess CREs including GCWGCWGC, CGACACGC, and Myb binding-like motifs. Based on the presence or absence of candidate CREs using MAMA and known PLACE CREs, we found that the Boruta-XGBoost model explained expression patterns with high accuracy of about 83%. Enriched sequences of both novel MAMA CREs and known PLACE CREs led to high accuracy expression patterns. We also found new roles of known CREs in the Fe excess response, including the DCEp2 motif, IDEF1-, Zinc Finger-, WRKY-, Myb-, AP2/ERF-, MADS- box-, bZIP and bHLH- binding sequence-containing motifs among Fe excess-responsive genes. In addition, we built a molecular model and promoter structures regulating Fe excess-responsive genes based on new finding CREs. Together, our findings about Fe excess-related CREs and conserved sequences will provide a comprehensive resource for discovery of genes and transcription factors involved in Fe excess-responsive pathways, clarification of the Fe excess response mechanism in rice, and future application of the promoter sequences to produce genotypes tolerant of Fe excess.


Chemosphere ◽  
2021 ◽  
pp. 131102
Author(s):  
Md. Shafiqul Islam ◽  
Abdoul Salam Issiaka Abdoul Magid ◽  
Yali Chen ◽  
Liping Weng ◽  
Md Yasir Arafat ◽  
...  
Keyword(s):  

BIO-PROTOCOL ◽  
2021 ◽  
Vol 11 (13) ◽  
Author(s):  
Li-he Xu ◽  
Li-ying Xiao ◽  
Xue-qiong Xiao ◽  
Yannong Xiao ◽  
Gao-feng Wang

2019 ◽  
Vol 10 (1) ◽  
pp. 300 ◽  
Author(s):  
Qun Rong ◽  
Kai Zhong ◽  
Fangyuan Li ◽  
He Huang ◽  
Chuanzhang Li ◽  
...  

Excessive accumulation of cadmium (Cd) and arsenic (As) in rice (Oryza sativa L.) poses a potential health risk to populations. Cd and As exhibit opposite geochemical behavior in paddy soil, using appropriate remediation materials to reduce their migration and inhibit their uptake by rice is a great challenge. A pot culture experiment was conducted to investigate the effects of application of silkworm excrement biochar (BC) and ferrous sulfate (Fe(II)) on available Cd and As in paddy soils and their uptake by rice. Results showed that the application of BC + Fe significantly accelerated the tillering of rice plants, and the addition of BC alone to soil did not have a significant effect on the pH of soil, while applied 1% (w/w) BC and 1% (w/w) Fe(II) (1BC-1 Fe(II)) treatment could markedly reduce the soil pH. BC+Fe(II) could reduce the content of available Cd (reduced by 10%–23%) and As (reduced by 6%–33%) in soil. BC+Fe(II) has a distinct decreasing effect on the available As, thus inhibiting As uptake in rice tissues, and the effect was more obvious with an increasing mass ratio of Fe in BC+Fe(II) treatment. BC+Fe(II) decreased bioaccumulation factors (BF) of As compared to control and BC alone treatments. Compared with As, Cd was more readily transferred from the root to the shoot and accumulated in rice eventually. These findings provide a safe and reliable remediation strategy though application of BC+Fe(II) in Cd and As co-contaminated soil. However, the improvement effect of amendments should be paid a special attention on soil pH.


Biomolecules ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 247 ◽  
Author(s):  
Muhammad Umer Farooq ◽  
Zhichen Tang ◽  
Tengda Zheng ◽  
Muhammad Ahsan Asghar ◽  
Rui Zeng ◽  
...  

Cadmium (Cd) is a well-known metal imposing threats to human health, and it can be accumulated in polished rice over the permitted range of 0.2 mg kg−1 (GB 2762-2017). It has been reported that selenium (Se) application decreases Cd uptake. Se-rich diets have gained attention recently, but the potential of Se-rich rice in mitigating Cd stress needs further investigation. In this study, a pot experiment in the field was conducted to assess the influence of environmental factors and exogenous split application of Se on the nutritional status of rice under Cd stress. The results indicated that the increased fertilizer treatment in soil bulk linearly increased the metal content in rice grains. Approximately 50–70% of metal was recovered in rice tissues, while 5–20% of the metal that was applied leached down into the soil. A Se concentration of 0.4 mg kg−1 could significantly improve the total Se content in grain and mitigate Cd toxicity (1 mg kg−1) below the permitted range. Panicles and roots were more active for total Se accumulation in Se-rich and non-Se-rich rice, respectively. Polishing and milling operations can significantly reduce the Cd content, as rice bran in rice tissues accumulated most of the metal’s residues. The late matured rice cultivars consumed more heat units, and more metal contents were found in them. Collectively, it was found that Se can mitigate Cd toxicity, but the rice cultivation at T2 (high Cd; 2 mg kg−1 and Se; 1 mg kg−1) increased the metal uptake capability and health-risk index in polished rice, with its Se content heightened over permitted range of 0.04 to 0.30 mg kg−1 (GB/T 22499-2008). However, further molecular studies are required, in order to completely access the inverted Se accumulation behavior in rice tissues at high Cd soil stress.


2019 ◽  
Vol 19 (7) ◽  
pp. 2957-2970 ◽  
Author(s):  
Feng Jing ◽  
Zhijiang Yang ◽  
Xiaomin Chen ◽  
Wei Liu ◽  
Bilin Guo ◽  
...  

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