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Molecular Confirmation of Intraspecific Tomato (Solanum lycopersicum) Hybrids and Their Evaluation Against Late Blight and Cucumber Mosaic Virus

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Abstract

Tomato is one of the most consumed vegetables in the world. Diseases are the number one concern in the development of high-yield and disease-resistant tomato hybrids which is the foremost priority of breeders. Present study was conducted (1) to develop DNA-based markers for genetic confirmation of tomato F1 hybrids, (2) to utilize sequenced characterized amplified region (SCAR) marker linked to the Ph-3 gene for Phytophthora infestans resistance in tomato and (3) to evaluate male and female parental genotypes and their F1 hybrids against late blight (LB) and cucumber mosaic virus (CMV). For molecular studies, 58 previously reported markers including RAPDs (10), SCAR (01), EST-SSR (01) and SSR (46) were applied. The SCAR marker clearly differentiated the LB3 and LB4 from Roma and T-1359 and provided evidence for Ph-3 gene. The SCAR marker was able to confirm the Ph-3 gene in the hybrids Roma × LB4, Roma × LB3, Riogrande × LB2, Riogrande × LB3 and Roma × LB7. Out of several tested primers, SSR-22 proved useful for genetic confirmation of F1 hybrid TMS1 × Money Maker (MM). For LB, tested hybrids/genotypes were ranked as susceptible to highly susceptible with different infection percentage (IP). However, the pace of symptom development was slower in hybrid Rio × LB2, 45% IP after 10 days of inoculation compared with 85% disease in one of the parent genotypes (Riogrande). None of the tested genotypes was found resistant; however, TMS1 responded as tolerant against CMV using mechanical inoculation. Under natural field conditions, TMS1 was found resistant while hybrids TMS1 × Naqeeb and TMS1 × MM were tolerant where as others were found to be susceptible. In conclusion, all tomato hybrids were genetically confirmed using DNA-based markers. SCAR marker was useful for marker-assisted confirmation of the Ph-3 gene in parental lines and hybrids; however, this gene was unable to provide protection against the local population of P. infestans.

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Acknowledgements

The authors are grateful for the provision of financial support by Pakistan Science Foundation, Islamabad, under the project No. PSF/NSLP/P-NIAB (164) entitled “Development of high yielding and disease resistant hybrids of tomato” to complete this study.

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Correspondence to Amjad Hameed.

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Hameed, A., Saleem, M.Y., Akhtar, K.P. et al. Molecular Confirmation of Intraspecific Tomato (Solanum lycopersicum) Hybrids and Their Evaluation Against Late Blight and Cucumber Mosaic Virus. Mol Biotechnol 59, 234–240 (2017). https://doi.org/10.1007/s12033-017-0010-2

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  • DOI: https://doi.org/10.1007/s12033-017-0010-2

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