“Paving the way for the selection of hybrids resistant to ToLCV”

Tomato leaf curl virus (ToLCV) is a begomovirus transmitted by the whitefly (Bemisia tabaci) and is responsible for serious losses in tomato production. In this context, the current investigation was conducted to determine high-yield heterotic combiners, ToLCV resistance, and gene mode of action for economically important traits. For this, 11 preselected inbred lines were crossed in a semi-diallel manner to generate 55 F 1 hybrids.

The 55 crosses with 11 parents and commercial controls were evaluated for different horticultural traits and resistance to ToLCV. Molecular validation with SCAR markers TG0302 and SCAR1 confirmed the presence of ToLCV resistant genes in parents and their crosses. Hybrid IIHR-2902 × IIHR-2852 showed the presence of Ty -2 and Ty -3 alleles in the homozygous state. The estimation of σ SCA ² and σ GCA ² was significant. He also indicated that the genetic control of the target traits was under additive and non-additive genetic effects.

The values ​​of σ A/D 2 with σ GCA 2/ σ SCA ² found to be less than unity indicate the preponderance of non-additive gene action in the expression of the traits studied, with the exception of the percentage incidence of sickness. Parent line IIHR-2919 was the best combiner for fruit and yield traits. The IIHR-2913 × IIHR-2898 cross combinations showed significantly higher economic heterosis for yield as well as the presence of Ty -2 and Ty -3 genes. The study paves the way for the selection of high-yielding, ToLCV-resistant hybrids in tomato.

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Chandel, Rahul & Sadashiva, A. & Ravishankar, Kundapura & Das, Anjan & Rout, Bichhinna Maitri & Singh, Saurabh. (2022). Genetic combination, heterosis analysis for horticultural traits of tomato (Solanum lycopersicum L.) using ToLCV resistant lines and molecular validation of Ty genes. Plant genetic resources: characterization and use. 1-10. 10.1017/S1479262121000630.