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Keshava Rao V.

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Principal Scientist (Organic chemistry)
Division of Basic Sciences
M. Sc., Ph. D.
Research Accomplishments: 

(During the Period of 2019-2023) 

  1. Papaya leaves contain many bioactive compounds which are used to treat dengue fever.A method was developed to extract bioactive compounds from papaya leaves. The extract yields ranged from 0.77 (ethyl acetate) to 2.34 % (methanol). The extracts were also tested in vitro against dengue virus. Ethyl acetate and methanol extracts were found to be effective against the virus when compared to other extracts. Papaya leaves of six species / varieties were compared for the concentration of secondary metabolites.
  2. Active extracts of papaya leaves were further fractionated to know the chemical compounds. Metabolite concentrations in the extracts of young and old leaves were also studied. Old leaves were found to possess more secondary metabolites than the young leaves. Storage stability of leaf powder was found to be good.
  3. More than 200 breeding lines of carrot are screened for high carotene content. Some 5-6 lines were selected with good carotene content of more than 18 mg/100 g.
  4. A method was developed for the extraction of pesticidal compounds from annona seeds. The extract was tested against sucking pests like aphids, thrips and white fly. The extract was found to control aphids on par with the chemical means.  Storage stability was high and only 4- 5 % percent reduction in acetogenins was observed.
  5. Annona fruit parts were profiled for their chemical parameters. Fruit rind was found to contain high amount of antioxidants and phenols to the extent of 10 – 15 %. Seed fatty acid profiles of 14 annona varieties were established. Varieties were grouped on chemical basis.
  6. Vegetable breeding lines of amaranth and dolichos, ash gourd, bottle gourd were screened and superior and antioxidant rich varieties were identified. Amaranth varieties with lower amounts of anti-nutrients like oxalates and nitrates were identified.
  7. 102 breeding lines of watermelon were screened and 2 lines with very high citrulline (240mg/100 g) were identified.
  8. Medicinal plants like brahmi, centella and bacopa were analyzed for their active principles. Superior lines with high active principles were identified.
  9. Jamun fruits of 40 varieties were evaluated for different biochemical parameters including anthocyanins. Some lines with high anthocyanin (154 mg/100 g) were identified.
  10. Natural antioxidants from pomegranate rind were isolated. These extracts were tested in cookies to control the oxidative rancidity. They were found to arrest the rancidity in cookies on storage. They were also found to enhance the nutraceutical value of the foods on fortification.
  11. 18 varieties of leafy vegetables grown in eastern region were evaluated for their nutritional composition. Some were found to be nutraceutically superior to the common ones.
Varieties / Technologies Developed: 


  1. Arka Supriya (Dolichos, Collaborator).
  2. Arka Ganga (Bottle gourd, Collaborator).
  3. Arka Shreyas (Bottle gourd, Collaborator)
  4. Arka Nutan (Bottle gourd, Collaborator)
  5. Arka Shyama (Watermelon, Collaborator)
  6. Arka Bharat (Teasel gourd, Collaborator)
  7. Arka Keerthi (Tuberose, Collaborator)
  8. Arka Neelachal Ruchitha (Amaranth, Collaborator)
  9. Arka Neelachal Vrichitha (Amaranth, Collaborator)
  10. Arka Nelachal Bainishi, Collaborator).


  1. Arka Avocado Bread Spread (Collaborator).
  2. Arka Avacado Chutney (Collaborator)
  3. Arka Based formulation for management of Aphids under organic conditions.



(Best 10/High Impact) 

  1. Mahapatra, S., Sreeenivasa Rao, E., Shankara Hebbar, S., Keshava Rao, V.,  Pitchaimuthu, M. and Sriram S. (2023). Evaluation of rootstocks resistant to gummy stem blight and their effect on the fruit yield and quality traits of grafted watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai), The Journal of Horticultural Science and Biotechnology, DOI: 10.1080/14620316.2022.2164523
  2. Prasannakumar, N. R., Rao, V. K., Jyothi, N., Saroja, S., Lokesha, A. N., & Ramkumar, G. (2023). Evaluation of insecticidal properties of botanicals for sustainable management of sucking pests of horticultural crops. Journal of Applied Entomology, 147, 105– 115.
  3. Prasannakumar N.R., Rao V.K., Jyothi N., Saroja S., Bhat P. Shivarama. 2021. Evaluation of some leaf and seed extracts for their insecticidal properties against Aphis gossypii glover (hemiptera: aphididae). Pest Management in Horticultural Ecosystems, 27(1), 95-97.
  4. S. Azeez, G. Karunakaran, T.K. Roy, M.R. Jasmin, V.K. Rao, C.S. Bujji Babu, P.C. Tripathi and K.S. Shivashankara, (2022).  Nutritional quality of underutilized fruits with future potential in India – avocado, karonda, pummelo and rambutan, Fruits 77(2).
  5. Varsha, V., Smaranika Mishra, LingaiahH.B., Venugopalan R. , Keshav RaoV., Jyothi Kattegoudar and Madhavi Reddy K. (2022). Combining ability studies to develop superior hybrids in bell pepper (Capsicum annuum var. grossum L.) Journal of Horticultural Science, 16 (2), 199-205.
  6. Anil Kumar B.,  Rao V. K.,  Hima Bindu K.,  Rohini M.R. & Shivakumar (2021). Development, validation and application of RP-HPLC method for quantitative estimation of wedelolactone in different accessions and plant parts of Eclipta alba (L.), Journal of Plant Biochemistry and Biotechnology.
  7. Lavanya H.N., Mishra S., Sood M., Aghora T.S., Anjanappa M., Rao V.K. and Reddy A.B. (2021).Induced variability for yield and its attributing traits in cluster bean [Cyamopsis tetragonoloba (L. ) Taub] through gamma irradiation, J. Hortl. Sci., 16(1) : 64-68.
  8. Pal, S., Rao,  S. E., Shankara S Hebbar S. S.,  Sriram, S., Pitchaimuthu, M. and Rao, V. K. (2020). Assessment of Fusarium wilt resistant Citrullus sp. rootstocks for yield and quality traits of grafted watermelon, Scientia Horticulturae, 272 (109497); DOI: 10.1016/j.scienta.2020.109497
  9. Yadav R K., Kamala Jayanthi P D., Manish Kumar, Saravan Kumar P., Keshava Rao V. and Madhavi Reddy K. (2020).Screening chilli genotypes for whitefly (Bemisia tabaci Genn.) resistance: A vector for chilli leaf curl virus, International Journal of Chemical Studies, 8 (1), 971-979.
  10. Chinapolaiah A., Hima Bindu, K., Manjesh G.N., Thondaimana V., Keshava Rao V., Hariprasad Rao N., S. Sudheer Kumar S. (2019). Variability in L-Dopa and other biochemical composition of Mucuna pruriens (L.) an underutilized tropical legume, Industrial Crops & Products, 138, 111447 (In print)
  11. Sridhar, V., Sadashiva, A., Keshava Rao, V., Swathi, P., & Gadad, H. (2019). Trichome and biochemical basis of resistance against Tuta absoluta in tomato genotypes, Plant Genetic Resources: Characterization and Utilization, 17(3), 301-305. doi:10.1017/S147926211800062X


Address for Communication: 

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Email Address:
Telephone #: 
080-23086100 Extn 240