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Upreti, K.K.

Upreti, K.K.
Principal Scientist (Organic Chemistry)
Division of Plant Physiology & Biochemistry
Plant hormones
MSc, PhD
Research Accomplishments: 

• ABA and phenol contents with strong negative correlation with plant height and stem girth (r=0.95) are identified as good indicators of rootstock selection for vigour regulation in mango. • Based on the morpho-physiological observations and ABA levels, polyembryonic mango cvs `Vellaikolamban’ and `Muvandan’ have been identified as vigour regulating rootstocks. While `Vellaikolamban’ is the size controlling rootstock suitable for promoting high density plantation, the `Muvandan’ is vigorous rootstock. • Hormonal imbalance marked by reduction in IAA, DHZR and t ZR and polyamines coupled with increase in ABA and ethylene coincides with high incidence of drop of mango fruitlets during early phase of development. • Short days were found not conducive for flowering in mango, and it is possible that the signal for flower induction in winter could be some factor other than photoperiod. • The ratio of width of xylem:phloem, ethylene concentration and the contents of ACC and spermine were found significantly higher in the vigorous polyembryonic mango seedlings than those of less vigorous ones. • Paclobutrazol besides affecting gibberellins also increases ABA and cytokinin contents concomitant with C:N ratio and leaf water potential in mango buds to elicit flowering responses. • The decline in ethylene production, ACC content and ACC oxidase activity and increase in total polyamines, spermidine and spermine contents were found important attributes of paclobutrazol induced growth retardation. • A three year study showed that the foliar sprays of spermine (10-4M) 4-times at weekly interval during panicle emergence are beneficial for the control of fruit drop in mango cvs Alphonso and Arka Puneet. •The mango rootstock, Kurukan and 13-1 are relatively tolerant to soil alkalinity due to maintenance of better growth and water use efficiency, and sugar and ABA accumulation in roots. • Analyses of root sugars has potential to serve as biochemical marker for discriminating mango rootstocks for tolerance to alkalinity. • The ABA accumulation or cytokinin decline under water stress in French bean is dependent upon the age of leaves. Middle-aged leaves that showed greater decline in leaf area accumulated more ABA under stress. • Changes in morpho-physiological characters and yield attributes in the onion cultivars under stress showed that the cv. `Arka Kalyan’ is tolerant to the conditions of drought. • Epibrassinosteroid (5µM) treatments at reproductive phase are recommended for improvements in seed and pod yield in French bean under water stress conditions. The yield improvement is due to the positive effects of brassinosteroid on root nodulation. • Relative tolerance of grape rootstocks to salinity is associated with high xylem pole number and maintenance of higher xylem cross sectional area. • Rootstock, 110-R is relatively tolerant to salinity by virtue of its capacity to uptake low Na, maintenance of low Na:K ratio and higher ABA and glycine betaine accumulation under salinity conditions. • Rootstock, 110-R maintained high soluble protein concentration in roots and showed greater induction in proteins of molecular weights 11, 42.7, 66.4 70.1 and 89.4 KDa proteins, and higher activities of antioxidant enzymes such as SOD, catalase and peroxidase under salinity. • Under non-saline conditions, grape varieties showed better growth on Dogridge than 100-R rootstock. • The grape varieties, Cabernet Sauvignon and Flame seedless grafted on 110-R showed better tolerance to salinity and the tolerance is associated with the maintenance of high root:shoot dry mass ratio, leaf water potential, osmotic potential, water use efficiency and inductions in ABA and glycine betaine levels under salinity. • VAM (Glomus species) + bacterial consortium soil application improved the salinity tolerance of Dogridge rootstocks by increasing root:shoot ratio, K:Na ratio and enhancements in salinity induced increases in polyamines and ABA contents. • Mycorrhiza inoculation led to cytokinin increase in the roots of salinity subjected rootstocks plants plants which is significant in controlling the salinity induced decline in root growth. • Cv. Arka Gaurav revealed high levels of auxins and cytokinin- zeatin riboside contents and low levels of ethylene production in the flowers and flower buds under high temperature than the cv. Arka Mohini which possibly contributed to less drop in flowers and flower buds in cv. Arka Gaurav. • Exposure of capsicum plants to 35/25 °C (day/night) temperature during reproductive growth led to significant decline in the leaf soluble proteins content and induction in 60, 70 and 90 Hsps, with decline in soluble protein being high in cv. Arka Mohini and induction in 70 and 90 KDa Hsps in the cv. Arka Gaurav. • Changes in morpho physiological characters, endogenous hormones and yield attributes in pea cultivars under varying degree of water stress revealed that the cv. Arka Ajit is relatively tolerant to water stress, and water stress at flowering stage is most vulnerable. • HPLC procedure for the separation and quantification of polyamines, putrescine, spermidine and spermine was worked out. • Rapid and sensitive ELISA procedures using laboratory raised polyclonal antibodies against IAA, ABA and cytokinins-DHZR and ZR was worked out. • A single step extraction procedure for quantifying osmoprotectant, glycine betaine by HPLC was developed.

Important Publications: 

1. K.K. Upreti, G.S.R. Murti and R.M. Bhatt (1998). Response of French bean cultivars to water deficits: Changes in endogenous hormones, proline and chlorophyll. Biologia Plantarum 40: 381-388. 2. G.S.R. Murti, and K.K. Upreti (2003). Endogenous hormones and phenols in rootstock seedlings of mango cultivars and their relationship with seedling vigour. European J. Hort. Sciences 68 (1): 2-7. 3. K.K. Upreti and G.S.R. Murti (2004). Effects of brassinosteroids on growth, nodulation, phytohormone content and nitrogenase activity in French bean under water stress. Biologia Plantarum 48(3): 407-411. 3. K.K. Upreti and G.S.R. Murti (2004). Changes in electrolyte leakage, chlorophyll concentration, endogenous hormones and bulb weight in onion in response to water stress. Tropical Agriculture 81 (2): 127-132. 4. H.S. Yogeesha, K.K. Upreti, K. Padmini, K. Bhanu Prakash and G.S.R. Murti (2006). Mechanism of seed dormancy in egg plant (Solanum melongena L.). Seed Science & Technology 34(2): 319-325. 5. J.Satisha, G.S.Prakash, G.S.R. Murti and K.K. Upreti (2007). Water stress and rootstocks influences hormonal status of grafted grape vines. European Journal of Horticultural Sciences 72 (5): 202-205, 2007. 6. K. K. Upreti and G.S.R. Murti (2010). Response of grape rootstocks to salinity: changes in root growth, polyamines and abscisic acid. Biologia Plantrum 54(4): 730-734. 7. P. Chowdappa, S.P. Mohan Kumar, M. Jyothi Lakshmi and K.K. Upreti (2012). Growth stimulation and induction od systemic resistance in tomato against early and late blight by bacillus subtilis OTPB1 or Trichoderma hazardium OTPB3. Biological Control (in press). http://dx.doi.org/ 10.1016/j.biocontrol.2012.11.009 8. Sukhada Mohandas, S. Poovarasan, P. Panneerselvam, B. Saritha, K.K. Upreti, Ranveer Kamal and T. Sita (2013). Guava (psidium guajava L.) rhizosphere Glomus mosseae spores harbor actinomycetes with growth promoting and antifungal attributes. Scientia Hort. 150: 371-376. 9. Panneer Selvan, P., Mohandas, S., Saritha B., K.K. Upreti, Poovarasan, Monnappa, A. and Sulladmath, VV (2012). Glomus mosseae associated bacteria and their influence on stimulation of mycorrhizal colonization, sporulation, and growth promotion in guava (Psidium guajava L.) seedlings. Biological Agriculture & Horticulture 28(4): 267-279. 10 K.K. Upreti, Y.T.N. Reddy, S.R. Shivu Prasad, G.V. Bindu, H.L. Jayaram and Shailendra Rajan (2013). Hormonal changes in response to paclobutrazol induced early flowering in mango cv. Totapuri. Scientia Hort. 150: 414-418. 11. K.K. Upreti, L.R. Varalakshmi and H.L.Jayaram (2012). Influence rootstocks on salinity tolerance of grapevine: changes in biomass, photosynthesis, abscisic acid and glycine betaine. Indian Journal of Plant Physiology 17(2): 128-136. 12. K.K. Upreti, N.K. Srinivasa Rao and H.L. Jayaram (2012). Floral ascission in capsicum under high temperature: Role of endogenous hormones and polyamines. Indian Journal of Plant Physiology. 17(3&4): 207-214. 13. J.B. Mythili, G.V.S. Saiprasad, C.Naveena, P.R. ,Rajeev, PR and K.K. Upreti (2011). Differential response of tomato and tobacco to Agrobacterium mediated transformation with cytokinin independent -1 (CKI-1) gene as influenced by cytokinin levels. Indian J. Experimental Biology 49: 909-918.

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