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Genetic analysis of partial resistance to vine decline in watermelon [Citrullus lanatus (Thunb.) Matsum&Nakai]

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Abstract

Vine decline or sudden wilt caused by a complex of pathogens with unknown etiology is emerging as most destructive disease of watermelon in the southern part of India. In this direction ICAR-IIHR, has identified a prebred line derived from Citrullus amarus viz., BIL-53 to be field tolerant to this disease. This study was planned to understand the genetics of vine decline resistance in this accession. The BIL-53 used as resistant parent was crossed with icebox accession, IIHR‐140–152, a susceptible genotype to develop F1, F2, BC1 and BC2 generations and observe the segregation for disease reaction. The results in F2 and backcross progenies suggested that resistance is governed by a single recessive gene. BIL-53 is also known to possess resistance to WBNV and hence, this line can be used in resistance breeding programs to develop combined resistance to vine decline and watermelon bud necrosis orthotospovirus employing back cross breeding. Further, this line can be tested as a rootstock in overcoming vine decline as an immediate measure.

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Acknowledgements

The authors would like to acknowledge ICAR-IIHR, Bengaluru, for providing facilities for field and lab experiments.

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Correspondence to Eguru Sreenivasa Rao.

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Maragal, S., Arpitha, K., Revadi, M. et al. Genetic analysis of partial resistance to vine decline in watermelon [Citrullus lanatus (Thunb.) Matsum&Nakai]. Indian Phytopathology (2020). https://doi.org/10.1007/s42360-020-00197-z

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Keywords:

  • Watermelon
  • Resistance
  • Inheritance
  • Vine decline
  • Citrullus amarus