Biochemical traits contributing to thrips resistance in chilli (Capsicum annuum L.) genotypes
Thrips resistance in chilli
DOI:
https://doi.org/10.25081/josac.2025.v34.i2.9942Keywords:
Correlation, infestation, phenolic compounds, sugars, biochemical defenceAbstract
The study carried out during Rabi and Summer 2023-24 at the College of Agriculture, Hassan, assessed twelve chilli genotypes for resistance to thrips under field and pot conditions. Thrips presence and leaf curl index (LCI) were measured at three crop stages, while biochemical parameters (total phenols and soluble sugars) were analysed in both healthy and infested leaves. Results showed notable differences among genotypes. Resistant types (2019/CHIVAR 6 and 2021/CHIVAR 14) consistently displayed lower thrips incidence (20-25% LCIs) and higher phenol and sugar levels. In contrast, susceptible types (Byadgi Kaddi and 2021/CHIVAR 13) showed higher thrips incidence (>65% LCI) and lower phenolic content. These findings suggest that phenolic compounds were key to biochemical resistance, while sugars may support defense metabolism indirectly. The resistant genotypes identified could serve as donors in breeding programs for thrips-resistant chilli varieties.
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Copyright (c) 2026 Ravigouda S Kallanagoudra, T R Sunitha, G Pramod, Geetha Govind, T R Kavitha, C Suneetha, Suvarna Patil
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