Abstract
Okra is one of the most important vegetable crops grown all over the world. The production of okra is constrained by a viral disease, yellow vein mosaic disease (YVMD) which causes huge losses to okra cultivators. Even though many resistant varieties were released in the past, they had become susceptible to the disease. Thirty four genotypes of okra were evaluated under open field conditions for the selection of resistant or tolerant ones among them. The disease incidence in genotypes were recorded using the parameters viz., percent disease incidence, percent disease severity and coefficient of infection. Six genotypes were categorised as highly susceptible, 27 genotypes as susceptible and Susthira was the only resistant genotype obtained after field screening. The resistance of Susthira was further confirmed under protected conditions using whitefly mediated artificial inoculation of yellow vein mosaic virus. Studies on trichome density revealed higher number of trichomes in the stem, leaf and fruit of Susthira. The resistance of Susthira could be used for developing YVMD resistant varieties. Correlation studies between different plant growth, yield and disease parameters were carried out and it was found that disease incidence lead to the reduction in growth and yield of okra. The characters viz., average fruit weight and number of fruits per plant had positive correlation and high positive direct effect on yield. Selection of genotypes based on these characters along with coefficient of infection of YVMD is useful for further crop improvement.
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Original data is available in the MSc. Thesis of Alphy Mathew (2018-12-001), Kerala Agricultural University.
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Acknowledgements
The authors acknowledge the NBPGR (National Bureau of Plant Genetic Resources) regional station, Akola for the provision of okra germplasm used in this study. The authors are also grateful to Kerala Agricultural University for providing the funding needed for the research.
Funding
Research grant for MSc. Research provided by Kerala Agricultural University (R7/62047/19 dtd. 04.05.2019).
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Mathew, A., Pradeepkumar, T., Minimol, J.S. et al. Evaluation of okra genotypes against yellow vein mosaic disease (YVMD). Indian Phytopathology 75, 549–557 (2022). https://doi.org/10.1007/s42360-021-00457-6
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DOI: https://doi.org/10.1007/s42360-021-00457-6