Ramya Ambikapathi
@sinica.edu.tw
Postdoctoral Scholar
Postdoctoral Scholar at National Taiwan University and Academia Sinica, Taiwan
Graduation in Agriculture, post-graduation and a doctorate in Environmental Sciences have provided me with a strong foundation in understanding the environmental problems relating to air, water, and soil ecosystems. Agricultural sciences, crop production, rice cultivation, biodiversity, solid waste, wastewater, remote sensing, trace gases, air pollution stress on crops, and climate change mitigation were the main subjects in which I had always excelled right from my bachelor's to the doctoral degree.
During the course of my education, I took up several projects with the Indian Space Research Organization (ISRO) and Tamil Nadu Newsprint and Paper Limited (TNPL). As working with project groups and scientific experts in the ISRO team, I have good knowledge of scientific report writing, collaborative work, and communication skills. This association helped a lot in consolidating my understanding of environmental and developmental skills, especially valuable skills to manage, lead and collab
EDUCATION
PhD (Agriculture) in Environmental Science
RESEARCH, TEACHING, or OTHER INTERESTS
Agricultural and Biological Sciences, Environmental Science, Atmospheric Science, Pollution
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Periyasamy Dhevagi, Raveendra Gnana Keerthi Sahasa, Ramesh Poornima, Sundarajayanthan Ramakrishnan, Ambikapathi Ramya, and Sengottaiyan Priyatharshini
Springer Science and Business Media LLC
Raveendra Gnana Keerthi Sahasa, Periyasamy Dhevagi, Ramesh Poornima, Ambikapathi Ramya, Subburamu Karthikeyan, and Sengottaiyan Priyatharshini
Springer Science and Business Media LLC
Ambikapathi Ramya, Periyasamy Dhevagi, Ramesh Poornima, S. Avudainayagam, Makoto Watanabe, and Evgenios Agathokleous
Elsevier BV
Ramesh Poornima, Periyasamy Dhevagi, Ambikapathi Ramya, Evgenios Agathokleous, Raveendra Gnana Keerthi Sahasa, and Sundarajayanthan Ramakrishnan
Elsevier BV
Raveendra Gnana Keerthi Sahasa, Periyasamy Dhevagi, Ramesh Poornima, Ambikapathi Ramya, Pon Sathya Moorthy, Bharani Alagirisamy, and Subburamu Karthikeyan
Elsevier BV
Periyasamy Dhevagi, Raveendra Gnana Keerthi Sahasa, Ramesh Poornima, and Ambikapathi Ramya
Informa UK Limited
Microplastics (MPs), ever since they were identified as a potential and widely distributed persistent contaminant, the number of studies highlighting their impacts on various terrestrial ecosystems have been increasing. Recently, the effect of MPs on the agricultural ecosystem has gained momentum. Hence, the present review examines the impact of microplastics on agricultural crop systems and the mechanism underlying its toxicity. The current review revealed that most of the studies were conducted at a laboratory scale and under controlled conditions. Additionally, it was observed that polystyrene (PS) followed by polyethylene (PE) are the most studied polymer type, while the most studied plants are wheat and maize. Hitherto, literature studies suggest that the microplastics' influence on plant growth can be negative or sometimes neutral; while in some cases it exerts a hormetic effect which depends on other factors determining plant growth. Notably, the main mechanisms through which microplastics influence plant growth are mechanical damage, alteration of soil properties, or by leaching of additives. Overall, with burgeoning research interest in this aspect, the current review has significant implications for the toxicity of MPs on plants and throws light on the need to develop novel guidelines toward the sustainable use of plastics in agricultural sector. However, realistic field-level studies and estimating the MPs concentration at various region are essential to develop remediation approaches. Future studies should also focus on translocation and accumulation of micron sized MPs in edible portion of crops and their effect on food safety.
Ambikapathi Ramya, Ramesh Poornima, Ganesan Karthikeyan, Sengottiyan Priyatharshini, Kalyanasundaram Geetha Thanuja, and Periyasamy Dhevagi
Springer International Publishing
Ramesh Poornima, Periyasamy Dhevagi, Ambikapathi Ramya, Muthunalliappan Maheswari, Subburamu Karthikeyan, and Raja Mani M. Jayabalakrishnan
Elsevier BV
Periyasamy Dhevagi, Ramesh Poornima, Raveendra Gnana Keerthi Sahasa, Ambikapathi Ramya, Sangilidurai Karthika, and Karuppusamy Sivasubramanian
Informa UK Limited
Periyasamy Dhevagi, Ambikapathi Ramya, Ramesh Poornima, and K Chandrakumar
Archives of Agronomy and Soil Science Informa UK Limited
Ambikapathi Ramya, Periyasamy Dhevagi, and S. S. Rakesh
Nanotechnology in the Life Sciences Springer International Publishing
Periyasamy Dhevagi, Ambikapathi Ramya, Sengottiyan Priyatharshini, and Ramesh Poornima
Ozone: Science and Engineering Informa UK Limited
Ambikapathi Ramya, Periyasamy Dhevagi, Sengottiyan Priyatharshini, R. Saraswathi, S. Avudainayagam, and S. Venkataramani
Environmental Monitoring and Assessment Springer Science and Business Media LLC
The plant response to elevated ozone stress reveals inter-species and intra-species disparity. Ozone-induced crop yield loss is predicted to increase in the future, posing a threat to the world economy. This study aims to evaluate the cultivar specific variation in rice exposed to elevated ozone. Fifteen short-duration rice cultivars were exposed to 50 ppb ozone for 30 days at reproductive stage. The physiological, biochemical, growth and yield traits of all test cultivars were significantly affected in response to elevated ozone. On an average, ozone stress decreased the tiller number by 22.52%, number of effective tillers by 30.43%, 1000 grain weight by 0.62% and straw weight by 23.83% over control. Spikelet sterility increased by 19.26% and linear multiregression 3D model significantly fits the spikelet sterility and photosynthetic traits with the R2 of 0.74 under elevated ozone. Principal Component Analysis with total variance of 57.5% categorized 15 rice cultivars into four major groups, i.e., ozone sensitive (MDU6, TRY(R)2 and ASD16), moderately ozone sensitive (ASD18, ADT43, and MDU5), moderately ozone tolerant (ADT37, ADT(R)45, TPS5, Anna(R)4, PMK(R)3, and ADT(R)48), and ozone tolerant (CO51, CO47, and ADT36). This study indicates that the different responses of rice cultivars to elevated ozone stress through a change in plant physiology, biochemical, growth, and yield traits and the results directed to provide scientific information on plant adaptations to ozone stress and helps in efforts to search ozone tolerant gene for plant breeding.
Ambikapathi Ramya, Periyasamy Dhevagi, S.S. Rakesh, M. Maheswari, Subburamu Karthikeyan, R Saraswathi, C.N. Chandrasekhar, and S Venkataramani
Environmental Advances Elsevier BV
Periyasamy Dhevagi, , Ambikapathi Ramya, Murugaiyan Sindhuja, Sengottiyan Priyatharshini, Subramanian Avudainayagam, , , , and
Journal of Experimental Biology and Agricultural Sciences Journal of Experimental Biology and Agricultural Sciences
Food crops grown in contaminated soils have a greater accumulation of heavy metals and the consumption of food crops grown in the contaminated soils are the source of metals that enters into the human body. Rice being a major food crop, the presence of heavy metals should be monitored regularly for reducing health risk. The analysis of total heavy metal always overestimates the content which leads to misinterpretation of results; however, bioaccessible heavy metal analysis projects the actual health risk. Hence, the present study aims to assess the bioavailable form of heavy metals in rice. The rice samples were collected from 20 different places and used for the inherent and bioavailable metal estimation. In vitro simulated digestion method was applied for bioaccessible metal analysis. Metal concentration in polished rice ranged from 0.10 to 0.82, 0.10 to 1.07, 0.11 to 0.56 and 0.23 to 1.09 mg kg-1 for Lead (Pb), Nickel (Ni), Cadmium (Cd) and Chromium (Cr), respectively. Twenty five percent of the samples recorded less than 0.028, 0.01, 0.01, and 0.03 mg kg-1 of bioaccessible Pb, Ni, Cd, and Cr, respectively. A significant negative correlation was observed between total metal concentration and bioaccessibility percentage. Targeted Hazard Quotient (THQ) of all the metals were less than one for adults indicating that there were no health risks, which undoubtedly reveals the importance of bioaccessible metal analysis. Hence, regular monitoring of heavy metals is essential to reduce the intensive accumulation in the human food chain. Also, the present study has opened up a wide scope on human health risk assessment using an in vitro digestion model.
P. Dhevagi, , S. Priyatharshini, A. Ramya, M. Sudhakaran, , , and
Journal of Environmental Biology Triveni Enterprises
Aim: Removal of lead from wastewater using Azotobacter species and optimisation of various parameters to maximise the adsorption of lead by response surface methodology as a tool. Methodology: The bacterial isolate UBI-7 recovered from sewage water irrigated soil was examined for its biosorption potential towards lead. The lead removal efficiency of Azotobacter salinestris was studied with respect to metal concentration (50-250 mg l-1), contact time (24-120 hrs), and pH (4-8).Using response surface methodology, these factors were optimized and R2 value obtained was 0.9710 for lead ions, which indicates the validity of the model. Observation with Fourier Transform Infrared (FTIR), Scanning Electron Microscope imaging (SEM) and Energy Dispersive X-ray Spectroscopic analysis (EDX) were carried out to confirm lead biosorption by Azotobacter salinestris. Results: The lead tolerant bacterium isolated from sewage water irrigated soil (UBI-7) was recognized as Azotobacter salinestris by 16S rRNA based gene sequence analysis. The highest removal percentage of Pb (61.54) was 50 mg l-1 in 72 hrs equilibration period. Interaction effect between different levels of Pb and different contact time of the solution were found to be significant. Lead biosorption by the organism was confirmed by the changes in stretching intensities of functional groups as well as appearance of strong OH stretching at 3291.69 cm-1. Images obtained from Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopic studies of the bacteria (UBI-7) before and after biosorption clearly indicated lead adsorption. Interpretation: Current study proves that the functional groups of Azotobacter salinestris are involved in lead biosorption from aqueous solution which was confirmed through FTIR.EDX analysis also elucidated the lead absorption by the bacterial cells. Hence, this could be effectively utilized for decontamination of lead from the polluted environment. Key words: Azotobacter salinestris, Biosorption, Lead, Response surface methodology
Ambikapathi Ramya, Periyasamy Dhevagi, Sengottiyan Priyatharshini, C.N Chandrasekhar, K Valliappan, and S Venkataramani
Ozone: Science and Engineering Informa UK Limited
A study was carried out to evaluate the effect of elevated tropospheric ozone concentration on 15 rice cultivars. The cultivars were exposed to a weighted average ozone concentration of 51 ppb ±10%...
RECENT SCHOLAR PUBLICATIONS
MOST CITED SCHOLAR PUBLICATIONS
Publications
1. Poornima, R., Dhevagi, P., Ramya, A., Maheswari, M., Karthikeyan, S., and R.M. Jayabalakrishnan. 2022. Efficiency of protectants in alleviating ozone stress on rice cultivars (Oryza sativa L.). Atmospheric Pollution Research, 13: 101593. . IF: 4.91
2. Dhevagi, P., Ramya, A, Poornima, R. and K Chandrakumar. 2022. Effectiveness of Ethylene Diurea in Ameliorating Ozone stress in Blackgram Varieties (Vigna mungo L.). Archives of Agronomy and Soil Science. Online. . IF: 3.092
3.Ramya, A., P., Dhevagi, S.S. Rakesh, M. Maheswari, S. Karthikeyan, R. Saraswathi, C.N. Chandrasekhar and S. Venkataramani. 2021. Detection of ozone stress in rice cultivars using spectral reflectance. Environmental Advances 6; 100129. .
4. Dhevagi, P., A. Ramya, S. Priyatharshini, and R. Poornima. 2021. Effect of Elevated Tropospheric Ozone Toxicity on Vigna mungo L. Varieties. Ozone: Science & Engineering. Online, . IF: 2.562
5. Ramya, A., P., Dhevagi, S. Priyatharshini, R. Saraswathi, S. Avudainayagam and S. Venkataramani. 2021. Response of rice (Oryza sativa L.) cultivars to elevated ozone stress. Environmental Monitoring and Assessment. 193:808. . IF: 3.307
GRANT DETAILS
1. Student Senior Research Fellow – Indian Space Research Organization-Geosphere Biosphere Programme under Atmospheric Trace gases-Chemistry, Transport and Modelling Project (ISRO-GBT-ATCTM)
April 2018 – February 2021
Title: Establishment and maintenance of Environmental Observatory at Wood
House, Horticulture Research Station, Ooty for Atmospheric Trace gases
Chemistry Transport Modeling (ATCTM)
2. Student Junior Research Fellow- Tamil Nadu Newsprint and Paper Limited (TNPL Unit - II) under TNPL effluent irrigation project
November 2015 – December 2016
Title: Environmental quality assessment in the use of paper board industry waste
water for agroforestry system