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Please use this identifier to cite or link to this item: http://www.erepo.iihr.ernet.in/handle/123456789/149

Title: Breeding for begomovirus resistance in tomato (Solanum lycopersicum l.)
Authors: A T, Sadashiva
M, Krishna Reddy
K V, Ravi Shankar
T H, Singh
B, Manjunath
P, Swarnalatha
J, Deepa
K, Sudarshini
R, Pushpalatha
Keywords: Tomato
Virus resistance
Issue Date: 2010
Citation: Sadashiva, A.T., M. Krishna Reddy, K.V. Ravishankar, T.H. Singh, B. Manjunath, P. Swarnalatha, J. Deepa, K. Sudarshini and R. Pushpalatha . 2010. Breeding for begomovirus resistance in tomato (solanum lycopersicum l.).
Abstract: Tomato (Solanum lycopersicum L.) is one of the most important vegetable crops cultivated in India. Tomato Leaf Curl disease caused by begomoviruses is the major production constraint causing considerable yield losses. Adoption of tomato leaf curl virus (ToLCV) resistant varieties is the most practical way to combat this disease. Though several ToLCV resistant varieties / F1 hybrids are available for commercial cultivation, resistance to ToLCV is not stable over all the major tomato growing areas due to prevalence of different strains of ToLCV / begomoviruses warranting for identification of new sources of resistance to this serious disease. A systematic screening was undertaken at Indian Institute of Horticultural Research, Bangalore to identify stable sources of resistance to ToLCV. Eight lines viz; IIHR-1943 ( S. peruvianum), IIHR-1970 (S. peruvianum) IIHR-2101 (S. habrochaites f glabratum LA 1777), IIHR-2195, IIHR-2202, IIHR-2403, IIHR-2611 and IIHR-2321 (TLCVR-1) were found resistant to ToLCBV under screen house conditions. IIHR-2101 was also found to be resistant to ToLCNDV, when screened under field conditions in Delhi. Inter-specific hybrids were obtained between 15 SBSB x IIHR-2101 to transfer ToLCV resistance from IIHR-2101. Backcross with the recurrent parent (15 SB SB) was further advanced to obtain ToLCV resistant horticulturally superior recombinants in BC1F2. All the resistant progenies were screened using molecular markers linked to TY-2 and Ty-3. Marker studies revealed that none of the ToLCV resistant progenies carried either Ty-2 or Ty-3 gene indicating the presence of a new gene conferring resistance to ToLCV in IIHR -2101. Backcross inbred lines are being developed to identify the new marker linked to ToLCV resistance in IIHR-2101.
URI: http://hdl.handle.net/123456789/149
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