ABSTRACT This study investigated the biochemical responses of resistant and susceptible varieties of common bean ( Phaseolus vulgaris ) to bean common mosaic virus (BCMV) infection. In the study, colour parameters (L, a, b, chroma and hue angle), total phenolic content, total flavonoid content, proline, ferric reducing antioxidant power (FRAP), cupric reducing antioxidant capacity (CUPRAC), 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) scavenging activity, total soluble protein, hydrogen peroxide, malondialdehyde, chlorophyll content and antioxidant enzyme activities (catalase, ascorbate peroxidase and superoxide dismutase) were assessed. Results indicate that BCMV‐infected susceptible plants exhibited significant reductions in chlorophyll a, chlorophyll b, and chlorophyll a/b ratio, impairing their photosynthetic capacity. In contrast, resistant varieties maintained higher chlorophyll levels and exhibited less oxidative stress. The infection also induced increases in total phenolic and flavonoid contents across both plant types, with the resistant variety showing a more robust accumulation, indicating a stronger defence response. Antioxidant enzyme activities, including catalase, ascorbate peroxidase, and superoxide dismutase, were elevated in both varieties; however, the resistant plants demonstrated significantly higher activity levels. These findings underscore the differential biochemical responses between resistant and susceptible bean plants, highlighting the complex interactions between BCMV and host defence mechanisms. Understanding these distinctions is crucial for developing effective management strategies against BCMV.
Adak et al. (Sun,) studied this question.
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