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Exploring the Potential of Bacteria-Assisted Phytoremediation of Arsenic-Contaminated Soils
Shagol, Charlotte C.,Chauhan, Puneet S.,Kim, Ki-Yoon,Lee, Sun-Mi,Chung, Jong-Bae,Park, Kee-Woong,Sa, Tong-Min Korean Society of Soil Science and Fertilizer 2011 한국토양비료학회지 Vol.44 No.1
Arsenic pollution is a serious global concern which affects all life forms. Being a toxic metalloid, the continued search for appropriate technologies for its remediation is needed. Phytoremediation, the use of green plants, is not only a low cost but also an environmentally friendly approach for metal uptake and stabilization. However, its application is limited by slow plant growth which is further aggravated by the phytotoxic effect of the pollutant. Attempts to address these constraints were done by exploiting plant-microbe interactions which offers more advantages for phytoremediation. Several bacterial mechanisms that can increase the efficiency of phytoremediation of As are nitrogen fixation, phosphate solubilization, siderophore production, ACC deaminase activity and growth regulator production. Many have been reported for other metals, but few for arsenic. This mini-review attempts to present what has been done so far in exploring plants and their rhizosphere microbiota and some genetic manipulations to increase the efficiency of arsenic soil phytoremediation.
Shagol, Charlotte C,Krishnamoorthy, Ramasamy,Kim, Kiyoon,Sundaram, Subbiah,Sa, Tongmin Ecomed 2014 Environmental Science and Pollution Research Vol.21 No.15
<P>The Janghang smelter in Chungnam, South Korea started in 1936 was subsequently shutdown in 1989 due to heavy metal (loid) pollution concerns in the vicinity. Thus, there is a need for the soil in the area to be remediated to make it usable again especially for agricultural purposes. The present study was conducted to exploit the potential of arsenic (As)-tolerant bacteria thriving in the vicinity of the smelter-polluted soils to enhance phytoremediation of hazardous As. We studied the genetic and taxonomic diversity of 21 As-tolerant bacteria isolated from soils nearer to and away from the smelter. These isolates belonging to the genera Brevibacterium, Pseudomonas, Microbacterium, Rhodococcus, Rahnella, and Paenibacillus, could tolerate high concentrations of arsenite (As(III)) and arsenate (As(V)) with the minimum inhibitory concentration ranging from 3 to >20?mM for NaAsO2 and 140 to 310?mM NaH2AsO4??7H2O, respectively. All isolates exhibited As(V) reduction except Pseudomonas koreensis JS123, which exhibited both oxidation and reduction of As. Moreover, all the 21 isolates produced indole acetic acid (IAA), 13 isolates exhibited 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, 12 produced siderophore, 17 solubilized phosphate, and 13 were putative nitrogen fixers under in vitro conditions. Particularly, Rhodococcus aetherivorans JS2210, P. koreensis JS2214, and Pseudomonas sp. JS238 consistently increased root length of maize in the presence of 100 and 200?μM As(V). Possible utilization of these As-tolerant plant-growth-promoting bacteria can be a potential strategy in increasing the efficiency of phytoremediation in As-polluted soils.</P>
Shagol, Charlotte C.,Subramanian, Parthiban,Krishnamoorthy, Ramasamy,Kim, Kiyoon,Lee, Youngwook,Kwak, Chaemin,Sundaram, Suppiah,Shin, Wansik,Sa, Tongmin Korean Society of Soil Science and Fertilizer 2014 한국토양비료학회지 Vol.47 No.3
Arsenic is a known hazardous metalloid not only to the animals but also to plants. With high concentrations, it can impede normal plant growth and cause even death of plants at extremely high levels. A known plant response to stress conditions such as toxic levels of metal (loids) is the production of stress ethylene, causing inhibitory effect on root growth in plants. When the effect of various arsenic concentrations was tested to maize plant, the stress ethylene emission proportionately increased with increasing concentration of As(V). The inoculation of two arsenic tolerant bacteria; Pseudomonas grimonti JS126 and Pseudomonas taiwanensis JS238 having respective high and low 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity reduced stress ethylene emission by 59% and 30% in maize grown in arsenic polluted soils. The result suggested the possible use of Pseudomonas grimonti JS126 for phytoremediation of arsenic polluted soils.
Charlotte C. Shagol,Kwang-Jin Kim,Seung-Won Han,Na Ra Jeong,Hyeon Ju Kim,정영빈,Hyung-Kwon Yun 인간식물환경학회 2018 인간식물환경학회지 Vol.21 No.5
This study aimed to provide information to urban plant growers on the best light requirement for indoor plants. Chlorophyll fluorescence analysis was used to determine the photosynthetic activity of indoor plants as affected by light intensity. Determination of the light intensity requirement for each plant was done by applying the Bayesian Michaelis-Menten equation which was obtained using the Lineweaver-Burk plot. The Vmax and Km values were determined, where the photosynthetic activity measured as electron transport rate (ETR) was denoted as Vmax and light intensity (photosynthetically active radiation, PAR) of ½ maximum ETR was designated as Km. The ETR of 93 indoor plant species were determined and Vmax/2 and Km values of each plant were calculated which resulted in seven levels of light intensity. The levels are as follows: Level 1 - more than the Km value; Levels 2 to 7 were determined using the formula: maximum Km value of the level = Km(½)n-1 where n refers to the level (i.e. n2 = level 2, …7). The best is level 1 while the most sub-optimal is level 7. The different plants have a wide range of light intensity requirements. Majority of the plants (70) had ½ maximum ETR at 20 up to less than 100 μmol m-2 s-1 PAR, while 13 plants at 100 to 149 μmol m-2 s-1 and only 10 plants at 150 up to 290 μmol m-2 s-1. The indoor plants can be classified according to light intensity requirement: low light intensity, e.g. Dracaena sanderiana ‘Gold’ (20.9); moderate light intensity, e.g. Cyclamen persicum (99.1); and high light intensity, Polyscias fruticosa (290.2 μmol·m-2·s-1). The data generated from this study can be utilized in IoT to make the information on plant cultivation and environmental conditions accessible to urban growers who use smartphones.
Exploring the Potential of Bacteria-Assisted Phytoremediation of Arsenic-Contaminated Soils
Charlotte C. Shagol,Puneet S. Chauhan,Kiyoon Kim,Sunmi Lee,Jongbae Chung,Keewoong Park,Tongmin Sa 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.1
Arsenic pollution is a serious global concern which affects all life forms. Being a toxic metalloid, the continued search for appropriate technologies for its remediation is needed. Phytoremediation, the use of green plants, is not only a low cost but also an environmentally friendly approach for metal uptake and stabilization. However, its application is limited by slow plant growth which is further aggravated by the phytotoxic effect of the pollutant. Attempts to address these constraints were done by exploiting plant-microbe interactions which offers more advantages for phytoremediation. Several bacterial mechanisms that can increase the efficiency of phytoremediation of As are nitrogen fixation, phosphate solubilization, siderophore production, ACC deaminase activity and growth regulator production. Many have been reported for other metals, but few for arsenic. This mini-review attempts to present what has been done so far in exploring plants and their rhizosphere microbiota and some genetic manipulations to increase the efficiency of arsenic soil phytoremediation.
Charlotte C. Shagol,Parthiban Subramanian,Ramasamy Krishnamoorthy,Kiyoon Kim,Youngwook Lee,Chaemin Kwak,Suppiah Sundaram,Wansik Shin,Tongmin Sa 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.3
Arsenic is a known hazardous metalloid not only to the animals but also to plants. With high concentrations, it can impede normal plant growth and cause even death of plants at extremely high levels. A known plant response to stress conditions such as toxic levels of metal (loids) is the production of stress ethylene, causing inhibitory effect on root growth in plants. When the effect of various arsenic concentrations was tested to maize plant, the stress ethylene emission proportionately increased with increasing concentration of As(V). The inoculation of two arsenic tolerant bacteria; Pseudomonas grimonti JS126 and Pseudomonas taiwanensis JS238 having respective high and low 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity reduced stress ethylene emission by 59% and 30% in maize grown in arsenic polluted soils. The result suggested the possible use of Pseudomonas grimonti JS126 for phytoremediation of arsenic polluted soils.