scholarly journals Response of Root Exudates of Bruguiera gymnorrhiza (L.) to Exposure of Polycyclic Aromatic Hydrocarbons

2022 ◽  
Vol 9 ◽  
Author(s):  
Beibei Liu ◽  
Lin Wu ◽  
Pan Pan ◽  
Ruilong Li ◽  
Bigui Lin
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Organic Acids ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Bruguiera Gymnorrhiza ◽  
Total Sugars ◽  
Mangrove Root ◽  
Degradation Rates ◽  
Hydroponic Cultivation ◽  
Polycyclic Aromatic

Root exudates play a pivotal role in the behaviors of polycyclic aromatic hydrocarbons (PAHs) in mangrove sediments, but the knowledge of how mangrove root exudates response to PAHs pollutants is limited. This study examined the root exudates of Bruguiera gymnorrhiza (L.) (B. gymnorrhiza) under exposure in phenanthrene, pyrene, and benzo[a]pyrene solution through a 45 days hydroponic cultivation. The results showed that the root exudates of B. gymnorrhiza were mainly hydrocarbon compounds. Tartaric acid was the dominant low molecular weight organic acids (LMWOAs) in root exudates. Under PAHs stress, the proportion of hydrocarbon compounds in root exudates decreased, while the proportion of amide compounds increased. At the first 15 days exposure, the amounts of dissolved organic carbon, soluble total sugars, total organic acids and LWMOAs all increased and reached the maximum values, subsequently, the amounts of root exudates had dropped. The degradation rates of PAHs followed the sequence of phenanthrene > pyrene > benzo [a] pyrene, and the presence of root exudates can significantly enhance the degradation of PAHs. The results illustrated that PAHs stress can significantly change the concentrations and species of root exudates. This study provides the scientific reference for understanding the ability of B. gymnorrhiza response to PAHs stress.

scholarly journals Tracing historical changes, degradation, and original sources of airborne polycyclic aromatic hydrocarbons (PAHs) in Jilin Province, China, by Abies holophylla and Pinus tabuliformis needle leaves

2021 ◽  
Author(s):  
Zhao Wang ◽  
Xiangzi Jin ◽  
Han Yeong Kaw ◽  
Zakia Fatima ◽  
Maurizio Quinto ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Dry Weight ◽  
Air Pollutant ◽  
Jilin Province ◽  
General Tendency ◽  
Coal Consumption ◽  
Pinus Tabuliformis ◽  
Degradation Rates ◽  
Polycyclic Aromatic

Abstract Due to their wide distribution and availability, plant leaves can be considered interesting candidates as biomonitoring substrates for the evaluation of atmospheric pollution. In addition, some species can also retain historical information, for example, related to environmental pollution, due to their leaf class age. In this study, the content of polycyclic aromatic hydrocarbons (PAHs) in Abies holophylla and Pinus tabuliformis needle samples in function of their class age has been investigated to obtain information regarding the degradation constant for each PAH under investigation (α values ranging from 0.173 to 1.870) and to evaluate the possibility to correlate the presence of PAHs in needles with some important pollution environmental factors. Considering air pollutant variables registered in Jilin Province, significant correlations (at 95% confidence level) have been found between coal consumption per year and anthracene contents in needles, while fluorene, phenanthrene, and anthracene resulted correlated with coal consumption. Furthermore, it has been demonstrated that the total PAH concentration in needles, for both species, increased with their age (from 804 to 3604 ng g− 1 dry weight), showing a general tendency to accumulate these substances through years. PAH degradation rates increased instead with molecular complexity. This study could be considered a first trial to obtain historical environmental information by pine needles biomonitoring.

scholarly journals Tracing historical changes, degradation, and original sources of airborne polycyclic aromatic hydrocarbons (PAHs) in Jilin Province, China, by Abies holophylla and Pinus tabuliformis needle leaves

2021 ◽  
Author(s):  
Zhao Wang ◽  
Xiangzi Jin ◽  
Han Yeong Kaw ◽  
Zakia Fatima ◽  
Maurizio Quinto ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Dry Weight ◽  
Air Pollutant ◽  
Jilin Province ◽  
General Tendency ◽  
Coal Consumption ◽  
Pinus Tabuliformis ◽  
Degradation Rates ◽  
Polycyclic Aromatic

Abstract Due to their wide distribution and availability, plant leaves can be considered interesting candidates as biomonitoring substrates for the evaluation of atmospheric pollution. In addition, some species can also retain historical information, for example, related to environmental pollution, due to their leaf class age. In this study, the content of polycyclic aromatic hydrocarbons (PAHs) in Abies holophylla and Pinus tabuliformis needle samples in function of their class age has been investigated to obtain information regarding the degradation constant for each PAH under investigation (α values ranging from 0.173 to 1.870) and to evaluate the possibility to correlate the presence of PAHs in needles with some important pollution environmental factors. Considering air pollutant variables registered in Jilin Province, significant correlations (at 95% confidence level) have been found between coal consumption per year and anthracene contents in needles, while fluorene, phenanthrene, and anthracene resulted correlated with coal consumption. Furthermore, it has been demonstrated that the total PAH concentration in needles, for both species, increased with their age (from 804 to 3604 ng g− 1 dry weight), showing a general tendency to accumulate these substances through years. PAH degradation rates increased instead with molecular complexity. This study could be considered a first trial to obtain historical environmental information by pine needles biomonitoring.

scholarly journals Degradation of polycyclic aromatic hydrocarbons in contaminated soil by immobilized laccase

2018 ◽  
Vol 83 (5) ◽  
pp. 549-559 ◽  
Author(s):  
Xin Wang ◽  
Yu Shi ◽  
Zi Ni ◽  
Zhao Li ◽  
Jia Bao
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Volume Ratio ◽  
Degradation Efficiency ◽  
Immobilized Laccase ◽  
Degradation Rates ◽  
Experimental Parameters ◽  
Polycyclic Aromatic ◽  
Ph Conditions ◽  
Better Than

The biodegradation of polycyclic aromatic hydrocarbons (PAHs) in soils by laccase is reported. However, the low laccase activities of free laccase have limited its applications in environmental bioremediation. In this study, polluted soil was made with 3:1 volume ratio of soil to PAH solution. Subsequently, the adsorption?cross-link composite immobilization method was applied to immobilize laccase derived from fungi onto nylon net and chitosan, respectively. These two kinds of immobilized laccase were used in the degradation of pyrene (Pyr) and benzo[a]pyrene (BaP), and their degradation efficiencies under different temperature and pH conditions were investigated. Consequently, the optimal laboratory experimental parameters were determined as follows: first, compared with free laccase, the degradation rates of Pyr and BaP by immobilized laccase increased by around 10?30 %; second, the degradation efficiency of chitosan as a carrier of immobilized laccase was much better than that of nylon net as a carrier of the immobilized laccase; finally, when the temperature was set at 40?C and the pH was set at 4, the degradation efficiency achieved by immobilized laccase was the best.

Low molecular weight organic acids enhance the high molecular weight polycyclic aromatic hydrocarbons degradation by bacteria

Chemosphere ◽  
2019 ◽  
Vol 222 ◽  
pp. 132-140 ◽  
Author(s):  
Anithadevi Kenday Sivaram ◽  
Panneerselvan Logeshwaran ◽  
Robin Lockington ◽  
Ravi Naidu ◽  
Mallavarapu Megharaj
Keyword(s):  
Molecular Weight ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Organic Acids ◽  
High Molecular Weight ◽  
Aromatic Hydrocarbons ◽  
Low Molecular Weight ◽  
Polycyclic Aromatic

scholarly journals Enhanced rhizodegradation of polycyclic aromatic hydrocarbons in corn straw-amended soil related to changing of bacterial community and functional gene expression

2021 ◽  
Author(s):  
Huanyu Bao ◽  
Jinfeng Wang ◽  
He Zhang ◽  
Jiao Li ◽  
Fuyong Wu
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Citric Acid ◽  
Bacterial Community ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Contaminated Soil ◽  
Corn Straw ◽  
Combined Application ◽  
Polycyclic Aromatic ◽  
Amended Soil

Abstract Root exudates can stimulate microbial degradation in rhizosphere, but it remains unclear whether the rhizodegradation of polycyclic aromatic hydrocarbons (PAHs) occurs in corn straw-amended soil. Hence, in the present study, either citric acid, a common low molecular weight organic acid in the root exudates, or corn straw was added into aged PAHs-contaminated soil to investigate their effectiveness in the biodegradation of PAHs. The present study showed that either corn straw (Y) or combined application of corn straw and citric acid (YN100) significantly (P < 0.05) enhanced the degradation of total PAHs in soil after 28 days incubation, which increased by 8.43% and 18.62% compared with control (CK), respectively. High-throughput sequencing suggested that both Y and YN100 treatments led to a shift in bacterial community in soil and increased the abundance of PAHs degraders. Interestingly, the copies of PAHs ring-hydroxylating-dioxygenase (PAH-RHD) Gram-negative bacteria (GN) genes under YN100 treatment was significantly (P < 0.05) higher than those under Y treatment in the soil. Network analysis showed that the potential hosts of PAH-RHDα genes were Lysobacter, Rhizobium, Bacillus, Devosia, Ohtaekwangia, Ramlibacter, Massilia, Steroidobacter, Phenylobacterium and Microvirga. Bacillus, Lysobacter, Rhizobium and Ohtaekwangia and all ten genera obviously increased under Y and YN100 treatments. These results indicate that combined application of corn straw and citric acid increased the PAH-degrading bacteria and PAH-RHDα genes, thus improving the biodegradability of PAHs in the soil. As these results verified, a combined corn straw-rhizosphere approach should be a feasible remediation strategy for PAHs-contaminated soil.

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