Abstract
The two cultivated Luffa species can be severely infected by Tomato leaf curl New Delhi virus (ToLCNDV) with up to 100% yield loss. Here, 52 Luffa genotypes were screened for ToLCNDV resistance after natural field infection. Mean vulnerability index (VI) ranged from 0.00 to 75.33; genotypes IIHR-137 and IIHR-138 had no symptoms (VI 0), 16 genotypes were resistant (VI 0–25), 15 were moderately resistant (VI 26–50), and 19 were moderate to susceptible (VI > 50). Ten of the most resistant genotypes and five susceptible checks were then challenge-inoculated using whiteflies or sap in an insect-proof net house; only IIHR-137 [L. cylindrica (L.) Roem.] was symptomless (VI 0.00), and 3–5% of plants of IIHR-138 [L. cylindrica (L.) Roem.] and IIHR-Sel-1 [L. acutangula (L.) Roxb.] had only mild symptoms; genotype Arka Prasan was most susceptible (VI 80.96). Asymptomatic plants were confirmed as infected using polymerase chain reaction. Susceptible genotypes rapidly developed leaf curling, then a severe mosaic 10 days post-inoculation. The resistant inbred lines identified are good candidates for a breeding program for ToLCNDV-resistant cultivars.
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Acknowledgements
The authors thank Dr A. D. Munshi for providing seeds of sponge gourd lines DSG-6 and DSG-7. The first author gratefully acknowledges Dr M. K. Reddy for his valuable guidance.
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Kaur, M., Varalakshmi, B., Pitchaimuthu, M. et al. Screening Luffa germplasm and advanced breeding lines for resistance to Tomato leaf curl New Delhi virus. J Gen Plant Pathol 87, 287–294 (2021). https://doi.org/10.1007/s10327-021-01010-z
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DOI: https://doi.org/10.1007/s10327-021-01010-z