Studies on inheritance of yellow vein mosaic virus (YVMV) resistance in okra (Abelmoschus esculentus L.) cv. Pusa Bhindi-5 and effect of YVMV disease on fruit nutritional quality

Abstract

The present investigation was carried out by involving six generations of okra, i.e., P1, P2, F1, F2, B1 (F1 × Pusa Bhindi-5) and B2 (F1 × Pusa Sawani) developed from two contrasting parents, one susceptible cultivar Pusa Sawani (P1) and another newly developed Bhendi yellow vein mosaic virus (YVMV) resistant variety Pusa Bhindi-5 (P2). The experimental data showed the maximum PDI (percent disease incidence) in susceptible parent Pusa Sawani (95.56%) followed by B2 (47.5%) and F2 (29%) after 90 days of sowing, whereas Pusa Bhindi-5, B1 and F1 were recorded highly resistant to YVMV disease even after 90 days of sowing. Backcross population B2 and F2 fell into the moderately susceptible (MS) category, whereas parent Pusa Sawani was recorded as highly susceptible (HS). Based on F2 and backcross data, the nature of inheritance of YVMV resistance in Pusa Bhindi-5 was found to be monogenic dominant. Analysis of t-test for the significance of the difference between the mean values of infected and healthy fruits was found to be highly significant with higher probability (p-value <0.05), indicating that the viral infection caused changes in the biochemical/nutrient contents such as protein, carbohydrate, dietary fiber, total ash and minerals. Most of the nutrients were negatively affected by the YVMV. Thus, this study ascertained the qualitative damage caused by this virus.