RM Dharmadasa 2

 

Prof. R.M. DHARMADASA

Director / Research Professor

 Herbal Technology Section

Qualifications

B.Sc. Sp. (Hons) - Agriculture -University of Ruhuna, Sri Lanka

M.Phil. – Botany (Biochemistry & Plant tissue culture)

                University of Sri Jayawardanepura, Sri Lanka

Ph.D.   – Botany (Plant systematics & secondary metabolites)

                University of Sri Jayawardanepura, Sri Lanka

Contacts

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Specialized Fields

  • Organic agriculture & insect pheromones
  • Agronomy & processing technology of medicinal plants
  • Tissue culture of medicinal, aromatic and ornamental plants
  • Plant taxonomy / Molecular taxonomy
  • Plant secondary metabolites and bioactive compounds
  • Pharmacognosy

Interest Areas       

  • Natural pesticides and insect pheromones, tissue culture technology for medicinal and ornamental plants, agrotechnology for medicinal plants, plant secondary metabolites and their biological activity, pharmacognosy of medicinal plants, organic farming

Publications

 

 

 

  1. Subramaniam Prabagar, Rathnayake Mudiyanselage Dharmadasa, Anantharasa Lintha, Suganja Thuraisingam, Jasotha Prabagar 2021.Accumulation of heavy metals in grape fruit, leaves, soil and water: A study of influential factors and evaluating ecological risks in Jaffna, Sri Lanka. Environmental and Sustainability Indicators,12, 
  2. Dehel Gamge Nadeeshani Dilhara, Rathnayake Mudiyanselage Dharmadasa, Don Chandana Abeysinghe, Rathnayake Gamplathge Saman Wijeekara, Gamika Prathapasinghe, Takao Somea (2012). Ethnopharmacological Survey on Medicinal Plants Used for Cosmetic Treatments in Traditional and Ayurveda Systems of Medicine in Sri Lanka. Evidence-Based Complementary and Alternative Medicine.
  3. Gamage, D.G.N.D, Dharmadasa, R.M. Abeysinghe, D.C, Wijesekara, R.G.S, Prathapasinghe, G.A; and Takao Someya, (2021).Effect of Drying Methods and Type of Packaging Materials on Phytochemical Content and Total Antioxidant Capacity of Five Medicinal Plants with Cosmetic Potential over Three Months Storage at Ambient Temperature. World Journal of Agricultural Research. 9(2):73-79.doi:10.12691/wjar-9-2-5
  4. Buddhika, H.D.K; Dharmadasa, R,M.:Menuka Arawwawala, L.D.A.; Pakeerathan, K. Phytochemical Properties of Clitoria ternatea L. (Fabaceae) – A Distinct Flower Morphometric Plants Available in Sri Lanka. Proceedings 2021,68.x.

  5. Gamage, D.G.N.D, Dharmadasa, R.M, Abeysinghe, D.C,Wijesekara, R.G.S, Prathapasinghe, G.A; and Takao Someya, (2021). Assessment of Phytochemical Contents and Total Antioxidant Capacity of Five Medicinal Plants with Cosmetic Potential under Three Different Drying Methods. World Journal of Agricultural Research, vol. 9(1) 24-28. doi: 10.12691/wjar-9-1-4De
  6. Silva G.B.V.U., Dharmadasa R.M., Senanayake R.A.S.P., and Lintha A., (2021). Selection of Superior Quality Cymbopogon nardus(L.) Rendle (Poaceae) Populations by Means of Quantity and Quality of Essential Oils. World Journal of Agricultural Research, 9(1), 1-8. doi: 10.12691/wjar-9-1-1.
  7. Jayasinghe J.A.T.U, Dharmadasa, R.M, Fonseka D.L.C.K, Arawwawala L.D.A.M (2020). Phytochemicals and antioxidant capacity of selected Rutaceae species used in Sri Lanka. Research Journal of Chemical Sciences, 10(3), 1-10
  8. Dharmadasa R.M., Jayasinghe J.A.T.U., Arawwawala L.D.A.M. and Fonseka D.L.C.K. (2020). Compositional Analysis of Volatile Compounds of Paspangiri- A Mixture of Leaves of Five Rutaceae Plants Used as an Effective Remedy for Respiratory System Microbial Infections in Traditional Systems of Medicine. World Journal of Agricultural Research. 8(3):84-88. doi: 10.12691/wjar-8-3-3
  9. Dirukshi, M.K.D.T, Dharmadasa, R.M, and D.C, Abeysinghe (2020). Selection of Superior Quality Annona Species by Means of Bioactive Compounds and Antioxidant Capacity. World Journal of Agricultural Research, 8 (2), 39-44. DOI: 10.12691/wjar-8-2-3.
  10. De Silva G.B.V.U., Dharmadasa R.M., Senanayake R.A.S.P., Lintha A., and Sewwandi S.K.U. (2020). Comparison of Essential Oil Content and Composition of Different Parts of Cymbopogan citrates (DC.) Stapf (Poaceae) Grown in Sri Lanka.” World Journal of Agricultural Research, (8)1: 1-5. DOI: 10.12691/wjar-8-1-1.
  11. Sadia Sadique, Shafaq Nisar, R.M. Dharmadasa, and Muhammad Idrees Jilani (2019). Effect of Nano-fertilizer and growth hormones on different plants. International Journal of Chemical and Biochemical Sciences.11, 113-119.
  12. R.M. Dharmadasa, A. Lintha, R.G.S. Wijesekara, D.C. Abeysinhe and P. Ranasinghe. (2019) Use of Halosarcia indica (willd.) Paul G. Wilson Extracts for Low Salted Dried Fish Production. World Journal of Agricultural Research. 7(4):132-136.
  13. Rathnayake, R.M.D.H.,   Dharmadasa, R.M. and D.C. Abeysinghe (2019). Effect of DifferentSpacing and Fertilizer Levels on Physical and Chemical Yield of Different Parts of Pogostemonheyneanus Benth. (Lamiaceae) World Journal of Agricultural Research, 7, (2) 49-51.
  14. Dilruni, A.D.G.L, Abeysinghe D.C, Dharmadasa RM and G.A Prathapasinghe (2019).and Mineral Compositions, Bioactive Compounds and Total Antioxidant Capacity of Different Parts of Moringa oleifera Lam. EC Nutrition 14(10): 922-927.
  15. Withanage, K.K.S. Abeysinghe, D. C. Dharmadasa. R.M, Gamika P.A. And L.J.A.P.A. Jayasooriya, (2018).Variation of Phytochemical Content and Antioxident Capacity of Domesticated and Non-domesticated Momordicacharantia L. populations in Different Maturity Stages. World Journal of Agricultural Research 6, (4), 140-143
  16. Premathilake, U. G. A.T, Wathugala, D. L. , Dharmadasa, R. M. (2018). Evaluation of chemical composition and assessment of antimicrobial activities of essential oil of lemongrass (Cymbopogon citratus (DC.) stapf) International Journal Of Minor Fruits, Medicinal And Aromatic Plants. 4(1)13-19.
  17. Premathilake U.G.A.T., Wathugala D.L. and R.M. Dharmadasa, (2018), Effect of Different Fertilizers on Crop Growth, Oil yield and Chemical Composition of Lemongrass (Cymbopogon citrates (DC.) Stapf). The Journal of Agricultural Sciences - Sri Lanka,13(3), 254-262.
  18. Premathilake, U. G. A.T., Wathugala, D. L. and R. M. Dharmadasa. (2018). Evaluation of chemical composition and assessment of antimicrobial activities of essential oil of lemongrass (Cymbopogon citratus(DC.) Stapf. International Journal of Minor Fruits, Medicinal and Aromatic Plants. 4 (1): 13-19.
  19. Premathilaka, W.G.A.T, Wathugala D.L., Dharmadasa, R.M. (2018). Phytotoxic potential of lemongrass (Cymbopogon citrates (DC.) Stapf. AllelophathyJournal, 44 (2) 261-268. DOI: 10.26651/ allele. J./2018-44-2-1168
  20. Rathnayake, A.M.G.N., Abeysinghe, D.C., Dharmadasa, R.M. Prathapasinghe,G.A. and Jayasooriya, L.J.A.P.A. (2018) Phytochemical and Populations of Momordica charantia L. Seed Harvested at Two Maturity Stages. World Journal of Agricultural Research
  21. R.M. Dharmadasa, Asitha Siriwardana, Kosala Samarasinghe, and Adhihetty, P., Standardization of Gyrinops Walla Gaertn. (Thymalaeaceae): Newly Discovered, Fragrant Industrial Potential, Endemic Plant from Sri Lanka. World Journal of Agricultural Research, 1, No. 6 (2013): 101-103. doi: 10.12691.
  22. Fernando, I.D.N.S., Dharmadasa, R.M. and D.C. Abeysinghe (2013). Determination of phenolic contents and antioxidant capacity of different parts of Withania somnifera (L.) Dunal. from three different growth stages. Ind. Crops Prod. 50: 537-539.
  23. Abeysiri, G.R.P.I., Dharmadasa, R.M. Abeysinghe, D. C. and K. Samarasinghe (2013). Screening of phytochemical, physico- chemical and bioactivity of different parts of Acmella oleraceae Murr. (Asteraceae), a natural remedy for toothache. Ind. Crops Prod. 50:852-856.
  24. R.M. Dharmadasa, Samarasinghe K, Adhihetty P, and Hettiarachchi P.L. (2013) Comparative Pharmacognostic Evaluation of Munronia pinnata (Wall.) Theob (Meliacae) and Its substitute Andrograhis paniculata (Burm.f.) Wall. Ex Nees (Acanthacea). World Journal of Agricultural Research 1, no. 5: 77-81.
  25. Siriwardane D.A.S, Dharmadasa, R.M., Samarasinghe., (2013). Distribution of withaferin A, an anticancer potential agent, in different parts of two verities of Withania somnifera (L.) Dunal. grown in Sri Lanka. Pakistan Journal of Biological Sciences. 16 (3) 141-144.
  26. Dharmadasa, R.M., Premakumara, G.A.S, Hettiarachchi, P.L, Ratnasuriya, W.D. (2012). Cytotoxcity and In-vivo antimalarial activity of aqueous whole plant extract of Munronia pinnata (Wall.) Theob. (Meliaceae) in mice. Research Journal of medicinal plant.
  27. Lenora, R.D.K., Dharmadasa, R.M., Abeysinghe, D.C., Arawwawala, L.D.A.M. (2011). Comparison of chemical profiles and plumbagin contents under different growing systems. Pharmacologia.
  28. Dharmadasa, R.M., Hettiarachchi, P.L. and Premakumara, G.A.S. (2011). Geographical distribution and conservation of a rare medicinal Plant Munronia pinnata (Wall.) Theob.(Meliaceae) in Sri Lanka. Bangladesh J. Plant. Taxon. 18(1): 39-49.
  29. Muthukumarana, R., and R.M. Dharmadasa. (2014). Pharmacognostical investigation of Plectranthus hadiensis (Forssk.) Schweinf. ex Sprenger. and Plectranthus amboinicus (Lour.) Spreng. World Journal of Agricultural Research,2(5),240-246.doi:10.12691/wjar-2-5-7available http://www.sciepub.com/wjar/content/2/5.
  30. Abeysinghe, D.C., Wijerathne, S.M.N.K., Dharmadasa, R.M. (2014). Secondary Metabolites Contents and Antioxidant Capacities of Acmella oleraceae Grown under Different Growing Systems. World Journal of Agricultural Research. 2(4), 163-167. DOI: 10.12691/wjar-2-4-5 available at http://pubs.sciepub.com/wjar/2/4/5/index.html.
  31. Abeywardhana, K.W., Abeysinghe, D.C., Dharmadasa, R.M. and A.M.L Aththanayake, (2014). Determination of Optimum Maturity Stage for Ocimum sanctum L. Grown under Different Growing Systems in Terms of Therapeutically Active Secondary Metabolites. World Journal of Agricultural Research, 2, (4): 159-162. doi: 10.12691/wjar-2-4-4. Available at http://pubs.sciepub.com/wjar/2/4/4/index.html.
  32. Dharmadasa, R.M., Hettiarachchi P.L., and Premakumara G.A.S (2014). Anatomical Traits as an Additional Taxonomic Tool for Munronia pinnata (Wall.) Theob. (Meliaceae) Found in Sri Lanka. World Journal of Agricultural Research. 2014, 2(4), 142-150. Available at: http://pubs.sciepub.com/wjar/2/4/1/index.html.
  33. Kankanamalage, T.N.M., Dharmadasa, R. M, Abeysinghe, D. C. and R.G.S. Wijesekara (2014). A survey on medicinal materials used in traditional systems of medicine in Sri Lanka. Journal of Ethnopharmacology. Available at: http://www.sciencedirect.com/science/article/pii/S0378874114004644.
  34. Dharmadasa, R.M., Hettiarachchi P.L., and Premakumara G.A.S (2014). Intraspecific Variation and Taxonomic Delimitation of Munronia pinnata (Meliaceae) in Sri Lanka. World Journal of Agricultural Research 2, No. 1:26-36. Available at: http://pubs.sciepub.com/wjar/2/1/5/index.html.
  35. Luxmini, K.P.A.M.K, Dharmadasa, R.M, Samarasinghe, K. Muthukumarana. P.R.M. 2015. Comparative Pharmacognostic Study of Different Parts of Withania somniferaand its Substitute Ruellia tuberosa. World Journal of Agricultural Research 3, (1) : 28-33. Available at http://pubs.sciepub.com/wjar/3/1/7/index.html.
  36. Dharmadasa, R.M, Abeysinghe D.C, Dissanayake DMN. Abeywardhane K.W, Fernando N.S. 2015. Leaf Essential Oil Composition, Antioxidant Activity, Total Phenolic Content and Total Flavonoid Content of Pimenta Dioica (L.)Merr (Myrtaceae): A Superior Quality Spice Grown in Sri Lanka. Universal Journal of Agricultural Research 3(2): 49-52. Available at http://www.hrpub.org/download/20150201/UJAR3-10403258.pdf.
  37. Dharmadasa, R.M., Siriwardhane, D.A.S., Samarasinghe, K. S.H.C.S., Rangana S.H.C.S., Nugaliyadda, L., Indika Gunawardane., Aththanayake, A.M.L. 2015. Screening of Two Ocimum tenuiflorum L. (Lamiaceae) Morphotypes for their Morphological Characters, Essential Oil Composition and Fruit Fly Attractant Ability.World Journal of Agricultural Research 3.1  1-4. Available at http://pubs.sciepub.com/wjar/3/1/1/index.html.
  38. Dharmadasa, R.M., Rathnayake, R.M.D.H., Abeysinghe, D.C., Rashani, S.A.N., Samarasinghe, K.  and Attanayake, A.L.M. 2014. "Screening of Local and Introduced Varieties of Pogostemon heyneanus Benth. (Lamiaceae), for Superior Quality Physical, Chemical and Biological Parameters." World Journal of Agricultural Research, vol. 2, no. 6 (): 261-266. doi:10.12691/wjar-2-6-2. Available at http://pubs.sciepub.com/wjar/2/6/2/index.html.
  39. Dharmadasa R.M., De Soysa, E.J.S. Abeysinghe, D.C.  (2016). Comparison of Phytochemicals Antioxidant Activity and Essential Oil Content of Pimenta dioica (L.) Merr. (Myrtaceae) with Four Selected Spice Crop Species. World Journal of Agricultural Research,. 4, (6), 158-1
  40. Kumari, K. , Abeysinghe, D. , & Dharmadasa, R. M(2016). Distribution of Phytochemicals and Bioactivity in Different Parts and Leaf Positions of SteviaRebaudiana (Bertoni) Bertoni- a Non-caloric, Natural Sweetener. World Journal of Agricultural Research, 4(6), 162-165.available at http://pubs.sciepub.com/wjar/4/6/2/index.html#
  41. Panawala, P., Abeysinghe, D., & Dharmadasa, R.M (2016). Phytochemical Distribution and Bioactivity of Different Parts and Leaf Positions of Pimenta Dioica(L.) Merr (Myrtaceae). World Journal of Agricultural Research, 4(5), 143-146 http://pubs.sciepub.com/wjar/4/5/3/index.html#
  42. Keeragalaarachchi K.A.G.P.,Dharmadasa, R.M,  Wijesekara R.G.S., Enoka P Kudavidanage. (2016). Natural Antidiabetic Potential of Salacia chinensis L. (Celastraceae) Based on Morphological, Phytochemical, Physico-chemical and Bioactivity: A Promising Alternative for Salacia reticulata Thw. World Journal of Agricultural Research. 4,(2), 49-55. http://pubs.sciepub.com/wjar/4/2/3
  43. Dharmadasa, R..M. Akalanka, G., Muthukumarana, P. & Wijesekara, R. (2016). Ethnopharmacological survey on medicinal plants used in snakebite treatments in Western and Sabaragamuwa provinces in Sri Lanka. Journal of ethnopharmacology,  179, 110-127. http://www.sciencedirect.com/science/article/pii/S0378874115302944

Booklets published on underutilized medicinal plants:

  • Cultivation and processing of Solanum xanthocarpum (Katuwelbatu)
  • Cultivation and processing of Cassia angustifolia
  • Cultivation and processing of Piper longum
  • Cultivation and processing of Withania somnifera
  • Cultivation and processing of Munronia pinnata
  • Cultivation and processing of Plectranthes zeylanicus
  • Cultivation and processing of Acmella oleraceae
  • Cultivation and processing of Mucunapureins
  • Establishment of quality standards for controversial medicinal plants
  • Comprehensive study of Munronia pinnata
  • Medicinal plant in south East Asia
  • Guidance Document on Use of Nature-Based Solutions for Site-specific Landslide Risk Mitigation, Nature Based Landslide Risk Management Project in Sri Lanka
  • Cultivation and processing of Ocimum tenuiflorum L.
  • Cultivation and processing of Pogostemonheyneanus
  • Cultivation and processing of Acmella oleraceae
  • Cultivation and processing of Mucunapruriens
  • Cultivation and processing of Withaniasomnifera
  • Cultivation and processing of Plectranthes zeylanicus

Major Projects Undertaken

  • Principal Investigator  - Commercialisation of underutilised essential oil-bearing plants
  • Co-Investigator -  Evaluation of impacts of agrochemicals on grape tree and grape cultivating   soil and water; study of heavy metals, nitrate and phosphate content
  • Principal Investigator - Extraction, isolation and formulation of plant protection products (PPP) from local medicinal plants for the management of sucking pests of fruits, vegetables and ornamental plants
  • Principal InvestigatorIn vitro propagation of Stevia rebaudiana; A non-caloric sweetener
  • Co- investigator - Development of Technologies for Sustainable Raw Material Production for Cosmetic Industry Using Endemic Gyrinops Walla Gaertn. (Sin: Walla Patta)- An Endemic, Industrial Potential, Lucrative Fragrance Plant Grown in Sri Lanka
  • Principal Investigator - Establishment medicinal plant gardens in Schools
  • Principal Investigator - Formulation of a Para- pheromone from local varieties of Ocimum sanctum for the control of fruit and melon flies
  • Principal Investigator -Establishment of quality standards for the authentication of controversial endemic /rare herbal plants ofRauvolfiaserpentina, Rauvolfiadensiflora, Munroniapinnata, Andrographis panniculata, Withaniasomnifera and Rueliatuberosa
  • Co- Investigator - Systematic search for antimalarial compounds from different ecotypes of Munroniapinnata (Wall) Theob. (S = Binkohomba) a Sri Lankan medicinal plant used in traditional medicine for malaria
  • Principal Investigator - Large scale seed production of Amukkara (Withaniasomnifera)
  • Co- Investigator - Screening of suitable raw materials and establishment of commercial fertilizer units
  • Co- Investigator - Propagation and nursery practices of selected medicinal plants

Awards Received

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  • Gold medal for scientific innovation - 2020 - SLIC
  • Award for academic achievement - 2019- ITI
  • Award winning academic achievement - 2019-ITI
  • Gold medal for scientific innovation - 2019-SLIC
  • Outstanding reviewer award - 2018-ICP
  • Presidential award for scientific publications - 2018 & 2016 NRC
  • DASIS award for the most outstanding innovation - 2018 - SLIC
  • Gold medal for scientific innovation- 2018 - SLIC
  • Best project with nationally significant output - 2017 - ITI
  • Award for academic achievement - 2017 - ITI
  • Best oral presenter award - 2017 - SLAAS
  • Reviewer award -  2016 - JIPH
  • Reviewer award - 2016- JEP
  • Outstanding reviewer award - 2015 - JEP
  • Presidential award for scientific publications - 2015 - NRC
  • NRC merit award for scientific publication -  2014 - NRC
  • Postgraduate Research Award - 2013 - SLAAS
  •  Best Oral presenter award - 2010- INSYM

NRC-National Research Council; ITI-Industrial Technology Institute; INSYM-International symposium; JEP-Journal of Ethnopharmacology, SLIC-Sri Lanka Inventors commission, ICP- Industrial Crops and Products; JIPH- Journal of Infection and Public Health

 

1.     Subramaniam Prabagar, Rathnayake Mudiyanselage Dharmadasa, Anantharasa Lintha, Suganja Thuraisingam, Jasotha Prabagar 2021.Accumulation of heavy metals in grape fruit, leaves, soil and water: A study of influential factors and evaluating ecological risks in Jaffna, Sri Lanka. Environmental and Sustainability Indicators,12, 

Last Updated on Tuesday, 21 September 2021 19:43

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