Dr. DharmadasaRM Dharmadasa 2



Senior Deputy Director 

Research Fellow
Bio Technology Unit


B.Sc. (Hons) - Agriculture (University of Ruhuna, Sri Lanka - 1995)

M.Phil. – Plant tissue culture and chemistry (University of Sri Jayawardanepura, Sri Lanka - 2002)

Ph.D. – Plant systematics and bioactivity (University of Sri Jayawardanepura, Sri Lanka - 2011)


 E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Specialized Fields

  • Development of natural pesticides and insect pheromones
  • Development of agro technology and processing techniques for medicinal and aromatic plants
  • Development of tissue culture technology for medicinal and ornamental plants
  • Plant taxonomy (chemo taxonomy and molecular taxonomy)
  • Bioactivity of medicinal plants
  • Pharnmacognosy of medicinal plants
  • Organic farming / organic fertilizer
  • Environmental Impact assessment (Flora, Fauna and biodiversity)


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






  • 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.  
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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), 158-161
  • 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#
  • 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


  • 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.


  • 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.



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

Major Projects Undertaken

  • Formulation of a Para- pheromone from local varieties of Ocimum sanctumhe control of fruit and melon flies
  • Establishment of quality standards for the authentication ofendemic /rare herbal plants of   Rauvolfia serpentina, Rauvolfia densiflora, Munronia pinnata, Andrographis panniculata, Withania somnifera and Ruelia tuberose
  • Systematic search for antimalarial compounds from different ecotypes of Munronia pinnata (Wall) Theob. (S = Binkohomba) a Sri Lankan medicinal plant used in traditional medicine for malaria
  • Large scale seed production of Amukkara (Withania somnifera).
  • Establishment of commercial fertilizer units
  • Propagation and nursery practices of selected medicinal plants
  • Selection and genetic improvement of Piper nigrum cultivars for higher spice value.
  • Formulation of a para-pheromone from local varieties of Ocimum sanctum for the control of fruit and melon flies.

Last Updated on Thursday, 08 March 2018 14:41

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