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Arjun Adhikari,이고은,Muhammad Aaqil Khan,강상모,Bishnu Adhikari,Muhammad Imran,JANRAHMATULLAH,김경민,이인중 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.1
Silicon and phosphorus are elements that are beneficial for plant growth. Despite the abundant availability of silicate and phosphate in the Earth’s crust, crop nutritional requirements for silicon and phosphorus are normally met through the application of fertilizer. However, fertilizers are one of the major causes of heavy metal pollution. In our study, we aimed to assess silicate and phosphate solubilization by the bacteria Enterobacter ludwigii GAK2, in the presence and absence of phosphate [Ca3(PO4)2] or silicate (Mg2O8Si3), to counteract cadmium stress in rice (Oryza sativa L). Our results showed that the GAK2-treated rice plants, grown in soil amended with phosphate [Ca3(PO4)2] or silicate (Mg2O8Si3), had significantly reduced cadmium content, and enhanced plant growth promoting characteristics including fresh shoot and root weight, plant height, and chlorophyll content. These plants showed significant downregulation of the cadmium transporter gene, OsHMA2, and upregulation of the silicon carrier gene, OsLsi1. Moreover, jasmonic acid levels were significantly reduced in the GAK2-inoculated plants, and this was further supported by the downregulation of the jasmonic acid related gene, OsJAZ1. These results indicate that Enterobacter ludwigii GAK2 can be used as a silicon and phosphorus bio-fertilizer, which solubilizes insoluble silicate and phosphate, and mitigates heavy metal toxicity in crops.
Bishnu Adhikari,Sanjeev Kumar Dhungana,Muhammad Waqas Ali,Arjun Adhikari,김일두,신동현 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.5
Peanut sprouts are gaining increasing popularity as a potential source of functional food. The objective of this study was to investigate yield and food value of peanut sprouts of six Korean peanut genotypes (Daekwang, Akwang, Baekjung, Alogi, Pungan and Heugttangkong) from day 5 through 9. Functional compounds like polyphenol, flavonoid, and resveratrol contents were significantly (p\0.05) high in the sprouts compared to those in the seeds. Pungan yielded significantly (p\0.05) high sprouts followed by Alogi. However, antioxidant potentials and functional compounds in the sprouts varied significantly (p\0.05) with genotype, sprout part, and day after germination. Overall consideration of the yield, functional compounds, and antioxidant potentials of the sprouts suggested that more appropriate time of sprout harvest for Alogi and Pungan was day 5–7 and that for the other genotypes was day 5–8. The yield and functional properties of peanut sprouts significantly varied with genotypes, parts, and age.
유희라,Arjun Adhikari,강상모,전현정,이인중 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.6
The present study aimed to investigate the change in the morphological and physiologicalcharacteristics within sesame plant when subjected by regulating water levels. The experimentwas conducted at ground water level(GWL) 0, 20, and 40 cm in a paddy field soil. The resultsshowed that sesame growth characteristics, such as shoot length, stem thickness, leaf length, andleaf width were significantly higher in sesame at GWL 0 cm at 10 days after treatment(DAT)and 20 DAT than in those grown at a GWL of 40 cm. The shoot length and stem thickness ofsesame grown at a GWL of 20 cm was significantly higher than those grown at a GWL of40 at 10 DAT. The chlorophyll content was significantly lower in plants grown at a GWL 40 cmat 10 and 20 DAT over sesame grown in GWL of 0 and 20 cm. The stomatal conductanceremained consistent in all the GWL at overall time period. Moreover, the Ca content of sesamewas reduced in both GWL 40 cm and 20 cm at 10 DAT and 20 DAT as compared to GWL0 cm. The K content was increased at 10 DAT but was reduced at 20 DAT at both GWL 20 cmand GWL 40 cm over plant grown at GWL 0 cm. Likewise, the P content was decreased at10 DAT in both GWL 20 and GWL 40 cm but was significantly increased at 20 DAT in GWL20 cm as compared to plant at GWL 0 cm. Since the experimental soil is paddy field soil theseresults helps to understand the efficiency of sesame to tolerate the different stress levels of soilmoisture. Therefore, these research may help to predict the appropriate level of irrigation to beprovided at different time period for the sesame if it is grown in rice field as a commercialcrops.
강상모,Arjun Adhikari,이고은,Muhammad Aaqil Khan,Abdul Latif Khan,Raheem Shahzad,Sanjeev Kumar Dhungana,이인중 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.5
The use of plant growth-promoting rhizobacteria is economically viable and environmentally safe for mitigating various plant stresses. Abiotic stresses such as flood and drought are a serious threat to modern agriculture. In the present study, the indole-3-acetic acid-producing rhizobacterium R. sphaeroides KE149 was selected, and its effects on the growth of adzuki bean plants under flood stress (FS) and drought stress (DS) were investigated. IAA quantification of bacterial pure culture revealed that KE149 produced a significant amount of IAA. Moreover, KE149 inoculation notably decreased stress-responsive endogenous abscisic acid and jasmonic acid and increased salicylic acid in plants under DS and FS. KE149 inoculation also increased proline under DS and methionine under FS. In addition, KE149 inoculation significantly increased the levels of calcium (Ca), magnesium (Mg), and potassium (K) while lowering the sodium (Na) content in the plant shoot under stress. KE149-treated plants had markedly greater root length, shoot length, stem diameter, biomass, and higher chlorophyll content under both normal and stressed conditions. These results suggest that KE149 could be an efficient biofertilizer for mitigating water stress.
Investigating Biochemical Properties of Bacillus aryabhattai DA2 from Diesel-Contaminated Soil
Sang-Jun Kim,Arjun Adhikari,Ko-Eun Lee,Gil-Jae Joo 한국환경생물학회 2018 환경생물 : 환경생물학회지 Vol.36 No.2
Petroleum energy is the major source of the world energy market, and its massive usage, and the corresponding extreme environmental pollution, imposes a serious threat on the ecological cycles. By screening oil-contaminated soil, we isolated, identified, and characterized a novel strain that represents a considerable diesel-degrading potentiality; the Bacillus aryabhattai DA2 strain is registered in the NCBI with the accession number MG571630, and it possesses an efficient tributyrin-degrading capacity. The optimal condition for diesel degradation by DA2 strain was observed at pH between 7-8 and at the temperature of 30°C. The strain is resistant to salt as well as the antibiotics like ampicillin and streptomycin. These results indicate B. aryabhattai is one of the potential candidates for the remediation of the diesel-contaminated sites.
Eun-Jung Park,Arjun Adhikari,Lee-Rang Kim,Eun-Hae Kwon,Ki-Yong Kim,In-Jung Lee 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.2
Herbicides application to control invasive weeds is crucial for its proper management. However, the physiological response for susceptibility or tolerance of any weed species may differ vastly according to the type of herbicides application. Hence, appropriate type of herbicide selection with optimum doses would play a prominent role to control the weed incidence and distribution on any ecological state. Since, L. amplexicaule is rapidly invading the Korean productive land, it has generated a possible threat for eco-system as well as agricultural production. Considering these facts, we have screened different herbicides and estimated the appropriate doses to control L. amplexicaule. Our results showed that, Glufosinate P rapidly disintegrated the chlorophyll content as compared to other herbicides and significantly dropped the morphological attributes such as root length, shoot length and fresh biomass of L. amplexicaule plants. Moreover, two-fold application of glufosinate P could minimize 94% growth rate of L. amplexicaule. Hence, the current results recommend two-fold application of glufosinate P for optimum control of L. amplexicaule.
Mousa, Hamouda M.,Tiwari, Arjun Prasad,Kim, Jinwoo,Adhikari, Surya Prasad,Park, Chan Hee,Kim, Cheol Sang Elsevier 2016 Materials letters Vol.164 No.-
<P><B>Abstract</B></P> <P>Third-generation biomaterials aim to stimulate specific cellular responses at the molecular level, these materials characterized with a resorbable and bioactivity that help body heal once they have been implanted. Here, a biomimetic method was used to generate hydroxyapatite (HA) nanoplates on the surface of AZ31B Mg alloy via anodization in simulated body fluid (SBF), followed by a hydrothermal (HT) process. The resulting nanoplates were characterized using FE-SEM, XRD, and FT-IR, surface hydrophobicity, in addition, corrosion was assessed electrochemically. The excellent bioactivity of the treated samples compared with naked ones were confirmed <I>in vitro</I> with MC3T3-E1 osteoblastic cells with significant growth and proliferation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anodization/HT process was performed on the AZ31B Mg alloy. </LI> <LI> HA nanoplates like shape structure was generated after HT process. </LI> <LI> An improved bioactivity and corrosion resistance of the alloy was resulted. </LI> <LI> The generated nanoplates was found to mimic that in natural bone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Investigating Biochemical Properties of Bacillus aryabhattai DA2 from Diesel-Contaminated Soil
Kim, Sang-Jun,Adhikari, Arjun,Lee, Ko-Eun,Joo, Gil-Jae Korean Society of Environmental Biology 2018 환경생물 : 환경생물학회지 Vol.36 No.2
Petroleum energy is the major source of the world energy market, and its massive usage, and the corresponding extreme environmental pollution, imposes a serious threat on the ecological cycles. By screening oil-contaminated soil, we isolated, identified, and characterized a novel strain that represents a considerable diesel-degrading potentiality; the Bacillus aryabhattai DA2 strain is registered in the NCBI with the accession number MG571630, and it possesses an efficient tributyrin-degrading capacity. The optimal condition for diesel degradation by DA2 strain was observed at pH between 7-8 and at the temperature of $30^{\circ}C$. The strain is resistant to salt as well as the antibiotics like ampicillin and streptomycin. These results indicate B. aryabhattai is one of the potential candidates for the remediation of the diesel-contaminated sites.
Hee-La Ryu,Arjun Adhikari,Sang-Mo Kang,Yoon-Ha Kim,In-Jung Lee 경상대학교 농업생명과학연구원 2018 농업생명과학연구 Vol.52 No.6
Appropriate water level is the primary factor for the optimal yield of crop plants. The required water level varies according to the variety of the crops. In the present study, we investigated the optimum requirement of groundwater level(GWL) to grow sorghum and adzuki bean under paddy field soil. Here, we cultivated sorghum and adzuki bean using lysimeter filled with paddy soil under GWL 0 cm(NT) and GWL(20, 40 cm) where GWL 20 cm is maintained as a waterlogging condition. The plant growth promoting attributes were measured on the first day after treatment(0 DAT), 10 DAT and 20 DAT. The results showed that the growth parameter such as shoot length, leaf length, leaf width, and stem thickness of both sorghum and adzuki bean were constantly increased and were found higher at GWL 40 cm(except stem thickness and leaf width in sorghum at 20 DAT). The physiological parameters such as chlorophyll content and stomatal conductance were also found higher at GWL 40 cm in all DAT. In addition, the elements like P and K contents in adzuki bean, and Ca content in sorghum were constantly increased and was found higher in GWL 40 cm at all DAT. These results suggest that the GWL of 40 cm is appropriate for production of sorghum and adzuki bean especially in case of paddy soil.