Plant Pathology (2020) 69, 1777-1786

Ashish Kaushal, A.T. Sadashiva, M. Krishna Reddy, E. Srinivasa Rao, T.H. Singh, S. Sriram, M.V. Dhananjay, R. Venugopalan and Kundapura V. Ravishankar (2020)
Assessment of the effectiveness of Ty genes in tomato against Tomato leaf curl Bangalore virus
Plant Pathology 69 (9), 1777-1786
Abstract: Tomato leaf curl Bangalore virus (ToLCBaV), a monopartite begomovirus transmitted by the whitefly Bemisia tabaci, has become a major constraint in tomato production in the Indian subcontinent. Earlier breeding efforts in India led to the adoption of tomato cultivars carrying the resistance gene Ty-2. However, it has been observed recently that such cultivars/hybrids are susceptible to begomoviruses. This requires the identification of additional or new sources of resistance against ToLCBaV. The present study was undertaken to assess the effectiveness of several Ty genes in providing resistance against infection by ToLCBaV. The kinetics of virus multiplication in different Ty resistance gene stocks of tomato were estimated and compared using quantitative PCR data. Accumulation of viral genomic units and symptom severity were lower in tomato lines carrying Ty-3 and Ty-2 + Ty-3 compared with those carrying Ty-2 alone. All tested lines carrying Ty-2 showed typical tomato leaf curl disease symptoms. Tomato lines carrying Ty-2 + ty-5 and ty-5 + Ty-6 combinations had a significantly higher disease severity index and viral genomic units compared to those carrying Ty-3 and Ty-2 + Ty-3 at 30 days postinoculation. The accumulation level of ToLCBaV genomic units serves as a good indicator for resistance selection along with other parameters of disease. We present here a comprehensive overview of the effectiveness of Ty-2, Ty-3, and ty-5 alone as well as the combinations Ty-2 + Ty-3 and Ty-2 + ty-5 against ToLCBaV.
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tomato leaf curl Bangalore virus	Tomato (Solanum lycopersicum)	India