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Expression analyses of stress‑responsive genes in the hermatypic coral Acropora tenuis and its symbiotic dinofagellates after exposure to the herbicide diuron

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Marine Life Science & Technology 2023年第3期5卷 289-299页

作者： Hiroshi Ishibashi Seigo Minamide Ichiro Takeuchi Graduate School of Agriculture Ehime UniversityMatsuyamaEhime 790-8566Japan Center of Advanced Technology for the Environment Graduate School of AgricultureEhime UniversityMatsuyamaEhime 790-8566Japan

diuron is one of the most frequently applied herbicides in sugarcane farming in southern Japan,and *** addition,it is used as a booster substance in copper-based antifouling *** to these various uses,diuron is released into the marine environment;however,little information is available on gene expression in corals and their symbiotic algae exposed to *** investigated the efects of diuron on stress-responsive gene expression in the hermatypic coral Acropora tenuis and its symbiotic *** seven days of exposure to 1µg/L and 10µg/L diuron,no signifcant changes in the body colour of corals were ***,quantitative reverse transcription-polymerase chain reaction analyses revealed that the expression levels of stress-responsive genes,such as heat shock protein 90(HSP90),HSP70,and calreticulin(CALR),were signifcantly downregulated in corals exposed to 10µg/L of diuron for seven ***,aquaglyceroporin was signifcantly downregulated in corals exposed to environmentally relevant concentrations of 1µg/L *** contrast,no such efects were observed on the expression levels of other stress-responsive genes,such as oxidative stress-responsive proteins,methionine adenosyltransferase,and green/red fuorescent *** exposure had no signifcant efect on the expression levels of HSP90,HSP70,or HSP40 in the symbiotic *** results suggest that stress-responsive genes,such as HSPs,respond diferently to diuron in corals and their symbiotic dinofagellates and that *** HSPs and CALRs may be useful molecular biomarkers for predicting stress responses induced by the herbicide diuron.

关键词： Acropora tenuis Calreticulin Coral bleaching diuron Heat shock protein

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Heterogeneous photocatalytic degradation of diuron on zinc oxide: Influence of surface-dependent adsorption on kinetics,degradation pathway,and toxicity of intermediates

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Journal of Environmental Sciences 2019年第10期31卷 97-111页

作者： Sutaporn Meephon Thanyada Rungrotmongkol Somchintana Puttamat Supareak Praserthdam Varong Pavarajarn Center of Excellence in Particle Technology Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Biocatalyst and Environmental Biotechnology Research Unit Department of Biochemistry Faculty of Science Chulalongkorn UniversityBangkok 10330 Thailand Bioinformatics and Computational Biology Program Graduated School Chulalongkorn University Bangkok 10330 Thailand Department of Chemistry Faculty of Science Thammasat University Pathumthani 12120 Thailand Center of Excellence on Catalysis and Catalytic Reaction Engineering Department of Chemical Engineering Faculty of EngineeringChulalongkorn University Bangkok 10330 Thailand Research Program in Hazardous Substance Management in Agricultural Industry Center of Excellence on Hazardous Substance Management(HSM) Bangkok 10330 Thailand

Heterogeneous photocatalytic reaction has been generally applied for degradation of toxic *** of a compound using the same kind of catalyst that was synthesized differently are commonly found in ***,the reported degradation intermediates are normally *** issue is especially important for the degradation of toxic compounds because intermediates may be more toxic than their parent compounds and understanding the reason is necessary if appropriate catalysts are to be *** work systematically compares the photocatalytic degradation of diuron,a toxic recalcitrant herbicide,on two forms of zinc oxide(ZnO),i.e.,conventional particles with zinc-and oxygen-terminated polar surfaces as the dominating planes,and nanorods with mixed-terminated nonpolar *** and theoretical results indicate that both the rate of reaction and the degradation pathway depend on the adsorption configuration of diuron onto the *** molecules adsorb in different alignments on the two surfaces,contributing to the formation of different degradation *** the aliphatic and aromatic sides of diuron adsorb on the polar surfaces simultaneously,leading to an attack by hydroxyl radicals from both *** the other hand,on the mixed-terminated surface,only the aliphatic part adsorbs and is *** exposed surface is therefore the key factor controlling the degradation *** diuron degradation on ZnO,a catalyst confined tomixed-terminated surfaces,i.e.,ZnO nanorods,is more desirable,as it avoids the formation of intermediates with potent phytotoxicity and cytogenotoxicity.

关键词： diuron Photocatalysis Adsorption Degradation pathway Mechanism Toxicity

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Leaching Potential of diuron and Linuron in Gaza Soils

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American Journal of Plant Sciences 2014年第26期5卷 4040-4049页

作者： Yasser El-Nahhal Mohamed Abadsa Samir Affifi Department of Environment and Earth Sciences The Islamic University Palestinian National Authority (PNA) Gaza Palestine

This study investigated the leaching potential of diuron and linuron in different soil types in Gaza Strip, Palestine under laboratory and field conditions. Leaching potential was evaluated by tin columns and bioassay technique using Molokhia as test plant. The responses of the test plant were regressed versus concentrations of the herbicide to estimate linear regression equation and the regression coefficient. The obtained results indicate strong positive association between Molokhia and concentrations of diuron or linuron;accordingly it was used in the bioassay and estimation of the concentrations of the tested herbicides in the leaching depth. Leaching potential was very low in North Gaza and Kkan Younis soil, whereas in the Meddle zone soil was very large. Leaching potential under laboratory conditions was larger that under field conditions. The bioestimated concentrations in soil layer under field conditions were sever folds of magnitude lower than those under laboratory conditions. The interesting outcome of this study is that leaching potential is dependent on soil clay fraction, soil organic matter, and soil pH. These results provided answers to the questions raised by farmers in Gaza Strip.

关键词： Leaching Potential diuron Linuron Clay Fraction Soil Organic Matter Soil pH

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Distribution of diuron in Coastal Seawater and Sediments from West Sea Area of Zhoushan Island

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Open Journal of Marine Science 2013年第3期3卷 140-147页

作者： Huanzhi Xu Ading Lu Hao Yu Jingya Sun Ming Shen Marine Science and Technology College of Zhejiang Ocean University National Engineering Research Center of Marine Facilities Aquaculture Zhoushan China North China Sea Marine Technical Support Center of State Oceanic Administration Qingdao China

The pollution level of diuron in seawater and sediments in the west coastal sea area of Zhoushan Island from 2011 to 2013 was investigated. Results revealed that the concentration of diuron in seawater varies from less than (3.0 to 52.1) ng·L-1, with an average level of less than 11.1 ng.L-1. The annual average content was less than 7.9 ng.L-1, 13.9 ng.L-1, and 12.3 ng.L-1 in 2011, 2012, and 2013, respectively. The concentrations of diuron in marine sediments also varied from less than (0.3 to 3.9) ng.g-1 (dry weight), with an average concentration of less than 1.13 ng g-1 (dry weight). The annual average concentration was less than 0.851 ng.g-1, 1.328 ng.g-1, and 1.202 ng.g-1 in 2011, 2012, and 2013, respectively. The accumulation of diuron in seawater and sediments may pose a potential risk to the marine ecosystem of the investigated sea area.

关键词： diuron Seawater Sediment Zhoushan Island

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Adsorption of diuron and Linuron in Gaza Soils

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American Journal of Analytical Chemistry 2013年第7期4卷 94-99页

作者： Yasser El-Nahhal Mohamed Abadsa Samir Affifi Department of Earth and Environmental Sciences The Islamic University of Gaza Gaza Palestine

This study investigated the adsorption potential of diuron and linuron in selected soil samples collected from agricultural area of Gaza Strip, Palestine and correlated the adsorption results to the soil properties. The adsorption experiments are based on the batch equilibrium technique and UV-Spectrophotometer method to determine the equilibrium concentration of both herbicides. Results of adsorption experiment showed that linuron and diuron are adsorbed in various amounts in Gaza soils according to the variation in pH, organic matter and clay content. Adsorption isotherms of both herbicides were linear in the tested concentration. Fitting the adsorption data to Freundlich equation showed good fitting and Freundlich constants were less than one indicating physical adsorption processes. It is concluded that soil organic matter and pH affect the adsorption of both herbicides. These results provided a better understanding of the behavior of diuron and linuron in Gaza soils.

关键词： Adsorption diuron Linurn Soil Gaza

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Bioremediation of diuron in Soil Environment: Influence of Cyanobacterial Mat

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American Journal of Plant Sciences 2014年第8期5卷 1081-1089页

作者： Jamal Safi Yousef Awad Yasser El-Nahhal Al-Azhar University of Gaza Gaza Palestine Environmental Protection and Research Institute Gaza Palestine Al-Azhar University of Gaza Gaza Palestine Environmental Protection and Research Institute Gaza Palestine The Islamic University of Gaza Gaza Palestine

diuron is a herbicide widely used in the Middle East;its field application creates many environmental problems. This study investigated the bioremediation of diuron in soil environment by Cyanobacterial mats collected from Gaza Wadi. Various concentrations of diuron were injected in water saturated soil samples pre-treated with Cyanobacterial mat for several periods. Percent growth of Jews mallow as a test plant was taken as indicator of biodegradation of diuron. Results showed that diuron was degraded in soil and degradation was more pronounced when diuron was incubated with Cyanobacterial in the irrigation water. Larger applied rate of Cyanobacterial mat did not affect the biodegradation of diuron. These encouraging results suggest that application of Cyanobacterial mat could be a suitable method to remediate soil pollution.

关键词： Cyanobacterial Mat diuron Soil

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Weed Control Efficacy and Citrus Response to Flazasulfuron Applied Alone or in Combination with Other Herbicides

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American Journal of Plant Sciences 2012年第4期3卷 520-527页

作者： Megh Singh Analiza H. M. Ramirez Amit J. Jhala Mayank Malik Citrus Research and Education Center Horticultural Sciences Department Institute of Food and Agricultural Sciences (IFAS) Uni-versity of Florida Lake Alfred USA Monsanto Corp. Lincoln USA

Field experiments were conducted to evaluate the phytotoxicity of flazasulfuron on citrus species and efficacy on weeds when applied alone or in combination with other herbicides. Grapefruit was the most sensitive and tangerine was the least sensitive to flazasulfuron. Injury to grapefruit was 70% with the application of flazasulfuron at 0.20 kg a.i. ha–1 at 60 DAT and was reduced (5%) when flazasulfuron at 0.05 kg a.i. ha–1 was tank mixed with glyphosate at 0.84 kg·a.i.· ha–1. Flazasulfuron alone at all rates did not control grass weeds and common ragweed. Florida/Brazil pusley was moderately controlled with high rates of flazasulfuron from 30 to 45 DAT;however, control did not exceed 75%. There was good control of Spanishneedles (78% - 85%) and horseweed (73% - 81%) with flazasulfuron at all rates at 30 DAT but control declined later in the season. Tank mix of flazasulfuron with glyphosate improved flazasulfuron efficacy on grass and broadleaf weeds. Flazasulfuron at 0.07 kg a.i. ha–1 plus glyphosate at 1.70 kg a.i. ha–1 was more effective in controlling grass weeds (83%) at 60 DAT and provided the highest control (79%) of Florida/Brazil pusley at 45 DAT. There was excellent control (75% to 94%) of Spanishneedles and adequate control of eastern black nightshade and common ragweed with flazasulfuron tank mixed with glyphosate or diuron. This study showed that flazasulfuron alone does not adequately control grasses and some broadleaf weeds in citrus and tank mixing it with glyphosate or diuron improved flazasulfuron’s efficacy. However, injury to grapefruit was observed at rates which effectively controlled weeds. Further studies are needed to determine the most suitable flazasulfuron rate that could be used to manage weeds in grapefruit.

关键词： Chemical Weed Control Crop Safety diuron Glyphosate

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Glutathione-Responsive Carboxymethyl Chitosan Nanoparticles for Controlled Release of Herbicides

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Materials Sciences and Applications 2015年第6期6卷 591-604页

作者： Zhiyan Yu Xin Sun Haixia Song Wenqian Wang Zhao Ye Liyan Shi Kaikai Ding Department of Pharmaceutical Engineering School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan China

Glutathione-responsive carboxymethyl chitosan nanoparticles cross-linked with disulfide bonds were developed for controlled release of herbicides. The nanoparticles were synthesized by selfassembly of amphiphilic carboxymethyl chitosan derivative (CMCS-MUA) in aqueous solution and subsequently producing disulfide cross-linking bonds by ultrasonic treatment. TEM showed that the nanoparticles had a spherical core-shell configuration with a size of about 250 nm. Assessment of stability of the nanoparticles (considering mean diameter, polydispersity, and Zeta potential) was conducted over a period of three months, and the nanoparticles were found to be stable in solution. Herbicide-loaded nanoparticles were prepared using diuron as a model herbicide. In vitro release study revealed that diuron can be released from nanoparticles in a controlled manner depended on the glutathione concentration. Herbicidal activity assays performed with preemergence treatment of target species (Echinochloa crusgalli) showed the effectiveness of diuron- loaded nanoparticles. Assays with nontarget species (Zea mays) showed that the diuronloaded nanoparticles did not affect plant growth. The results indicate that the glutathioneresponsive nanoparticles prepared in this work will be a promising candidate for controlled release of herbicides in agriculture.

关键词： Glutathione-Responsive Nanoparticles Controlled Release Herbicides diuron

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