Pedosphere最新文献

{"title":"Numerical modeling of double-ring infiltrometers for determining saturated hydraulic conductivity of heterogeneous and anisotropic soils","authors":"Xiaoting XIE ,&nbsp;Hongxiang ZHOU ,&nbsp;Laosheng WU ,&nbsp;Jun MAN","doi":"10.1016/j.pedsph.2023.07.016","DOIUrl":"10.1016/j.pedsph.2023.07.016","url":null,"abstract":"<div><div>Philip's two-term infiltration equation has been widely used to infer soil saturated hydraulic conductivity (<em>K</em>_s), the accuracy of which is usually influenced by the size of infiltration rings and soil conditions. Previous studies have primarily focused on exploring the ring-size dependence of <em>K</em>_s estimations under specific soil conditions (<em>e.g</em>., soil isotropy and/or uniform initial water content). This study aimed to provide a comprehensive analysis by systematically considering eight heterogeneous and anisotropic soils with nonuniform initial water contents. Specifically, we examined the validity of Philip's infiltration equation as well as the recently proposed two forms (<em>i.e</em>., infiltration and time forms) of Parlange's infiltration equation both theoretically and in practical applications of double-ring infiltration. Then the time form of Parlange's equation was applied to infer <em>K</em>_s using double-ring infiltrometer measurements with different combinations of six inner ring diameters (10, 20, 40, 80, 120, and 200 cm) and three buffer index (defined as the ratio of the difference between inner and outer ring diameters to the outer ring diameter) values (0.20, 0.33, and 0.50). For each infiltrometer set, 20 stochastic <em>K</em>_s fields were randomly generated by adopting five standard deviation values (0.1, 0.3, 0.5, 0.7, and 0.9). Furthermore, we investigated the effects of five horizontal correlation lengths (30, 60, 150, 300, and 600 cm) on <em>K</em>_s estimations. The results demonstrated that Parlange's equation, compared to Philip's equation, was more universal in describing the cumulative infiltration relationship for the test soils. The combination of inner ring diameter and buffer index of 40 cm and 0.2, respectively, which satisfied most of the practical requirements for determining <em>K</em>_s in the Soil Water Infiltration Global (SWIG) database was optimal. When the horizontal correlation length exceeded a threshold (<em>i.e</em>., 150 cm in our study), the inner ring diameter was required to increase to 80 cm. Our findings contribute to accurate <em>K</em>_s estimations of different soils using double-ring infiltrometers.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1111-1122"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49417698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fe(II) oxidation after microbial Fe(III) reduction does not cause Cd release","authors":"Zhaoyang SUN ,&nbsp;Wenjun ZHANG ,&nbsp;Lei WANG ,&nbsp;Hongwen SUN ,&nbsp;Yuxuan WAN ,&nbsp;Qi LI ,&nbsp;Chaolei YUAN","doi":"10.1016/j.pedsph.2023.09.009","DOIUrl":"10.1016/j.pedsph.2023.09.009","url":null,"abstract":"<div><div>Soil flooding and drainage can cause the reduction and oxidation of iron (Fe), as well as the immobilization and mobilization of cadmium (Cd). However, the impact of Fe(II) oxidation following microbial Fe(III) reduction on Cd mobility remains unclear. In this study, we examined the behavior of Cd during microbial reduction of Fe(III) oxides and subsequent chemical re-oxidation of Fe(II) using batch reactor systems. The bacterium <em>Shewanella oneidensis</em> MR-1 was incubated with ferrihydrite, lepidocrocite, goethite, or hematite anaerobically and then aerobically in media containing 212 μg L^-1 Cd, with or without pH buffering (initial pH = 7.0). Compared to the control systems without MR-1, microbial Fe(III) reduction significantly promoted the immobilization of dissolved Cd, as well as the conversion of dissolved and adsorbed Cd to strongly bound Cd that could not be extracted by 0.4 mol L^-1 HCl. The mechanisms of Cd immobilization were different during the microbial reduction of different Fe(III) oxides. The buffering of system pH affected the phase of Fe oxides formed at the reduction and oxidation stages in the systems containing MR-1 and ferrihydrite or lepidocrocite. Nevertheless, in all the systems containing MR-1 and Fe oxides, irrespective of pH buffering, the concentration of dissolved Cd dropped to &lt; 1 μg L^-1 after 35 d of anaerobic incubation and remained &lt; 4 μg L^-1 after subsequent 72 h of aerobic incubation. This suggests that Fe(II) oxidation after microbial Fe(III) reduction (generating 0.025–0.22 g L^-1 Fe(II)) does not result in Cd release.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1076-1085"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term fallowing produces specific fungal taxa associated with soil carbon storage","authors":"Fang LI ,&nbsp;Lin CHEN ,&nbsp;Yue LI ,&nbsp;Yanlai HAN ,&nbsp;Yi WANG ,&nbsp;Peipei LI ,&nbsp;Shuiqing ZHANG ,&nbsp;Jiabao ZHANG","doi":"10.1016/j.pedsph.2023.10.001","DOIUrl":"10.1016/j.pedsph.2023.10.001","url":null,"abstract":"<div><div>Cropland expansion has caused the loss of soil organic carbon (SOC) and the degradation of microbial communities. Fallowing is an important strategy for soil restoration, and fungi are critical in soil fertilization. This study compared the soil properties and fungal assemblage in two adjacent environments (farmland <em>vs</em>. fallowing) using a 30-year field experiment composed of five treatments: fallowing and agricultural management under no fertilization, chemical fertilization, and chemical fertilization plus cow manure or crop straw. The fallowed soil had more diverse fungi and maintained higher SOC than the artificially managed treatments. Importantly, the relative abundance of Chaetomiaceae was positively correlated with all the carbon components (SOC, dissolved organic carbon, and microbial biomass carbon) simultaneously. An RNA-Seq of <em>Trichocladium uniseriatum</em>, the key fungus affiliated with Chaetomiaceae, showed that straw addition significantly upregulated the genes for <em>T. uniseriatum</em> melanogenesis, resulting in recalcitrant necromass formation. A remarkable carbon dioxide (CO₂) assimilation capacity of <em>T. uniseriatum</em> was revealed using ¹³C-labelling assay. Therefore, <em>T. uniseriatum</em> improved SOC storage directly by CO₂ fixation and indirectly by melanogenesis. Fertilization of agricultural systems can stimulate the growth of <em>T. uniseriatum</em>. Inoculation of <em>T. uniseriatum</em> promoted crop growth, facilitating carbon absorption from the roots. This study highlights that the valuable microbial species resources preserved in fallowed soils can improve farmland ecosystems.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1014-1025"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135849264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of soil amendment and foliar selenium applications on cadmium immobilization in soil and accumulation in wheat","authors":"Qiqi LIU ,&nbsp;Tianyi WU ,&nbsp;Qiugang WU ,&nbsp;Chen ZHANG ,&nbsp;Dafu WU ,&nbsp;Lihao ZHANG ,&nbsp;Jing ZHOU ,&nbsp;Huan ZHANG ,&nbsp;Jun ZHOU","doi":"10.1016/j.pedsph.2023.07.010","DOIUrl":"10.1016/j.pedsph.2023.07.010","url":null,"abstract":"<div><div>Wheat cadmium (Cd) contamination is one of the environmental and agricultural concerns worldwide. Here, the effects of applications of foliar selenium (Se) and soil amendments (lime, mixture of biofuel ash and sodium sulfide (DSO), and mixture of iron mine tailing and alkali lignin (MX)) on soil Cd fractions and wheat Cd accumulation were studied using laboratory incubation, greenhouse pot, and field plot experiments. In the laboratory incubation experiment, lime and MX applications significantly increased soil pH, DSO application significantly decreased soil pH, while all the three amendments significantly reduced soil bioavailable Cd fractions by 16%–21% compared to the control without any amendment. Foliar Se application significantly increased the growth and yield of the high-Cd-accumulating cultivar (Puxing5). In the greenhouse experiment, lime and MX applications considerably decreased grain Cd concentration by 55% and 47%, respectively, for Puxing5 and by 24% and 26%, respectively, for the low-Cd-accumulating cultivar (Zhoumai30). In the field experiment, grain Cd concentration was significantly reduced by 68% and 72% by lime and MX applications, respectively, for Puxing5. Application of DSO also significantly reduced grain Cd concentration by 58% for Puxing5 and 25% for Zhoumai30 in the greenhouse experiment, but increased grain Cd concentration by 22% for Puxing5 in the field experiment. Our results implicate that laboratory incubation and greenhouse experiment results are necessary to be verified in field, and foliar Se application is recommended when considering both financial costs and production safety.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1123-1135"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42130605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bioaugmentation of a novel bacterial consortium in cotton-planted soil for lambda-cyhalothrin degradation","authors":"Samina ANWAR ,&nbsp;Anusha LIAQAT ,&nbsp;Asma MUNIR ,&nbsp;Muhammad F. ASHRAF ,&nbsp;Samina IQBAL","doi":"10.1016/j.pedsph.2023.07.019","DOIUrl":"10.1016/j.pedsph.2023.07.019","url":null,"abstract":"<div><div>Extensive use of lambda-cyhalothrin (LC) for agricultural and domestic pest control leads to the accumulation of its residues in soil and water, which poses a serious threat to the environment. Remediation of LC at the point source is the most effective way to avoid its spread and harmful effects. Therefore, this study was planned to investigate the potential of indigenously isolated bacteria for the remediation of LC in cotton-vegetated soils. Three potent LC-degrading bacteria, <em>Brucella intermedia</em> Halo1, <em>Alcaligenes faecalis</em> CH1S, and <em>Aquamicrobium terrae</em> CH1T, were isolated from a pyrethroid-contaminated soil. A consortium CHST comprising these three strains was found to exhibit a higher potential for LC degradation as compared to the individual strains. The degradation of LC by CHST was optimized for four varying factors, <em>i.e</em>., pH, inoculum density (ID), carbon source (CS), and initial pesticide (<em>i.e</em>., LC) concentration (PC), by applying Taguchi design of experiment. The contributions of these factors to the biodegradation of LC were found to be in the order of pH &gt; CS &gt; PC &gt; ID. The enhanced degradation of LC (84%) was attained at pH 7.0 in minimum salt medium containing 10 mg L^-1 LC and 3% inoculum. The consortium CHST was also augmented in sterilized and unsterilized soil microcosms at three PCs, <em>i.e</em>., 2, 5, and 10 mg kg^-1. After 21 d of incubation, complete LC degradation was achieved at 2 mg kg^-1 PC in sterilized as well as unsterilized soil, whereas at higher PCs, the extent of degradation was comparatively less. At PC of 5 mg kg^-1, 88% and 96% LC degradation were observed in sterilized and unsterilized soils, respectively, compared to 79% and 90% degradation at 10 mg kg^-1, respectively. During biodegradation, the major metabolite of LC, <em>i.e</em>., 3-phenoxybenzoic acid, was produced and further degraded. In a cotton-planted soil spiked with 10 mg kg^-1 LC, the consortium degraded 91.8% LC, as well as improving the agronomic parameters of the cotton plants. In a nutshell, the consortium CHST was found to be a promising candidate for the remediation of LC contamination at the point source.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1100-1110"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44597804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyamide nylon 6 microplastics enhance nitrification activity in two agricultural soils","authors":"Areti NTAVIGLAKI ,&nbsp;Vasileios A. TZANAKAKIS ,&nbsp;Georgios GIANNOPOULOS ,&nbsp;Angeliki MARAGKAKI ,&nbsp;Ioannis ANASTOPOULOS ,&nbsp;Pantelis BAROUCHAS ,&nbsp;Ioannis PASHALIDIS ,&nbsp;Nikolaos MONOKROUSOS","doi":"10.1016/j.pedsph.2023.07.018","DOIUrl":"10.1016/j.pedsph.2023.07.018","url":null,"abstract":"","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1158-1162"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46633859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bacterial community characteristics in epigeic and anecic earthworm vermicompartments within soil-earthworm systems","authors":"Zhiming SHI ,&nbsp;Shuyu SHI ,&nbsp;Wenwen LI ,&nbsp;Congying WANG ,&nbsp;Feng HU","doi":"10.1016/j.pedsph.2023.09.011","DOIUrl":"10.1016/j.pedsph.2023.09.011","url":null,"abstract":"<div><div>Earthworms are crucial to soil ecosystems as keystone species. They perform various ecological functions through their associated microbiomes. However, the characteristics of these microbiomes in various vermicompartments (earthworm-associated compartments) within soil-earthworm systems have not been systematically studied. Here, using earthworms of two ecotypes (<em>i.e</em>., epigeic <em>Eisenia fetida</em> and anecic <em>Metaphire guillelmi</em>) as models, we conducted a full and comprehensive exploration of the bacterial community in several potential distinct compartments, including bulk soil, drilosphere, gut wall, gut content, and casts, through 2D-terraria incubation technology and high-throughput sequencing approaches. Bacterial diversity, community structures in each compartment, differential OTUs in vermicompartments compared with bulk soil, and the co-occurrence relationship of bacteria in bulk soil and gut-compartments (<em>i.e</em>., gut wall and gut content) were assessed. Results showed that three major vermicompartments, <em>i.e</em>., drilosphere, gut, and casts, were distinctly different in hosting the bacterial community. The levels of alpha diversity followed the order of drilosphere &gt; casts &gt; gut wall ≈ gut content. These patterns of vermicompartments along earthworms did not vary with ecotype, implying that the vermicompartments were the primary factors influencing the bacterial community. Finally, based on the difference in microbiomes in gut-compartments and the state-of-the-art use of the term “gut microbiomes”, it is recommended to establish a unified definition of gut microbes that encompasses microbiomes residing in both the gut wall and gut content, which could provide a clear and consistent understanding of gut microbiomes. This work provides a comprehensive overview of earthworm-associated microbiomes, enhancing our understanding of fundamental earthworm ecology and soil biology.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1038-1050"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Arsenic mobilization and nitrous oxide emission modulation by different nitrogen management strategies in a flooded ammonia-enriched paddy soil","authors":"Feng WANG ,&nbsp;Jing ZHANG ,&nbsp;Yanqiong ZENG ,&nbsp;Honghui WANG ,&nbsp;Xiyu ZHAO ,&nbsp;Yilin CHEN ,&nbsp;Huanhuan DENG ,&nbsp;Liyun GE ,&nbsp;Randy A. DAHLGREN ,&nbsp;Hui GAO ,&nbsp;Zheng CHEN","doi":"10.1016/j.pedsph.2023.09.008","DOIUrl":"10.1016/j.pedsph.2023.09.008","url":null,"abstract":"<div><div>Elevated arsenic (As) mobilization and increased nitrous oxide (N₂O) emission are two primary environmental concerns existing in flooded paddy soils. In this study, dissolved As(III), N isotope-labeled Na¹⁵NO₃, and/or ¹⁴NH₄Cl were incorporated into a microcosm incubation to determine the effects of N fertilization regimes on As mobilization and N₂O emission in a flooded paddy soil. Because nitrate had a higher redox potential and comprised a higher proportion of N substrate, As(V) was preferentially formed due to enhanced nitrate-dependent microbial As(III) oxidation. Thus, As availability was correspondingly attenuated due to the improved production of less mobile and toxic As(V). After 2-d incubation, more than 90% and 98% of soluble As(III) were immobilized in the As + NH₄⁺-N + NO₃^--N and As + NO₃^--N treatments, respectively. Following nitrate depletion (after 2 d), microbial As(V) and Fe(III) reductions were gradually enhanced, which was attributed to stimulation of anaerobic ammonium oxidation (anammox) coupled to Fe(III) reduction, known as Feammox, by the abundance of NH₄⁺. By the end of the incubation period (10 d), the As + NO₃^--N treatment led to higher As immobilization of originally added As(III) (<em>ca</em>. 61%) than the As + NH₄⁺-N + NO₃^--N treatment (42%). The As + NH₄⁺-N + NO₃^--N treatment prominently mitigated N₂O emission compared to the As + NO₃^--N treatment, which was ascribed to anammox, inducing accumulation of byproducts from incomplete denitrification. High-throughput sequencing indicated that the relative abundances of denitrifiers (<em>e.g</em>., <em>Azoarcus</em>, <em>Ochrobactrum</em>, and <em>Thiobacillus denitrificans</em>) increased in the As + NO₃^- treatment, whereas quantitative polymerase chain reaction results indicated higher 16S rRNA gene copy numbers for anammox and Feammox (Acidimicrobiaceae bacterium A6) bacteria in the As + NH₄⁺ + NO₃^- treatment. Collectively, the experimental results demonstrated that N fertilization can be a feasible As remediation strategy while providing an effective strategy for mitigating N₂O emission from paddy soils at the same time.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1051-1065"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of metal oxide nanoparticles on soil water retention curve and tensile strength","authors":"Elahe DARAEI ,&nbsp;Hossein BAYAT ,&nbsp;Pouya ZAMANI","doi":"10.1016/j.pedsph.2023.07.017","DOIUrl":"10.1016/j.pedsph.2023.07.017","url":null,"abstract":"<div><div>Generally, nanotechnology plays an very important role in various applied scientific fields. Iron and magnesium nanoparticles (NPs) can cause positive or negative changes in soil physical and mechanical properties, especially in long periods. The aim of this study was to investigate the multi-year effects of NPs on soil water retention and aggregate tensile strength. A wheat farm loamy soil was amended with 1%, 3%, and 5% (weight/weight) of magnesium oxide (MgO) and iron oxide (Fe₃O₄) NPs in three replications and incubated for three years. Water contents were measured at different matric suctions of 0, 10, 20, 40, 60, 100, 300, 1 000, and 15 000 cm. The van Genuchten model was fitted to the moisture data. Tensile strength was measured on the 2–4 mm aggregates at matric suctions of 300 (<em>i.e</em>., field capacity) and 15 000 (<em>i.e</em>., permanent wilting point) cm. The results showed that the levels of 1% and 3% Fe₃O₄ NPs significantly increased water retention, compared to the no NP application control and 5% MgO NPs, which is probably due to the increase of adsorption surfaces in the treated soils. Water contents at field capacity and permanent wilting point in the 5% MgO NP treatment decreased compared to those of the other treatments, due to the increased soil vulnerability and reduced soil fine pores. The application of Fe₃O₄ NPs did not have any significant effect on soil tensile strength. Based on the results of this study, soil physical and mechanical properties could be affected by NP application.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1136-1145"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47784665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silicon reduces cadmium accumulation in Moso bamboo (Phyllostachys edulis) root cell sap by sequestering cadmium in hemicellulose 1","authors":"Yuzhen CHANG ,&nbsp;Fan YANG ,&nbsp;Chaofeng YANG ,&nbsp;Yiting ZHENG ,&nbsp;Xianyu PAN ,&nbsp;Shanshan MA ,&nbsp;Haibao JI ,&nbsp;Ji Feng SHAO","doi":"10.1016/j.pedsph.2023.07.015","DOIUrl":"10.1016/j.pedsph.2023.07.015","url":null,"abstract":"<div><div>Moso bamboo is one of the most important economic bamboo species in China, but cadmium (Cd) pollution has become a potential threat of its sustainable development. Silicon (Si) reduces Cd accumulation in many plant species. However, the exact mechanisms of this effect in Moso bamboo are still poorly understood. Here, we investigated the effect of Si on Cd accumulation in Moso bamboo in terms of Cd concentration in roots, Cd cellular and subcellular distribution, root cell morphology, and gene expression. Seedlings (ten days old) were exposed to different concentrations of Cd (0, 1, 5, and 50 μmol L^-1) in a 0.5 mmol L^-1 CaCl₂ solution treated with (+Si) and without (-Si) 1 mmol L^-1 Si (as silicic acid) for two days. The effect of Si on the alleviation of Cd-induced inhibition of root elongation was not obvious, but Si could significantly reduce Cd accumulation in roots at all tested Cd concentrations (1, 5, and 50 μmol L^-1). Cadmium was localized in all cells of roots, but Si application altered the Cd distribution from all cells to distal side of exodermis cells in roots. Semi-quantitative determination of Cd using energy-dispersive X-rays revealed higher Cd concentrations in exodermis, but lower concentrations in the stele when Si was applied. However, Si increased Cd accumulation in root cell wall, but decreased it in cell sap. Moreover, more than 70% of Cd and Si were found in hemicellulose 1 of the cell wall. These results suggested that Si reduced Cd accumulation by sequestering Cd in hemicellulose 1 in the root cell wall at the subcellular level and retaining most of the Cd in the root exodermis at the cellular level in Moso bamboo under short-term Si application.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1002-1013"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41572491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}