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Cross-breeding is a method of producing progeny with better resistance to pathogens. Resistance to pathogens usually involves pathogenesis-related (PR) proteins. Class II chitinase is an example of a defensive PR protein in plants. The class II chitinase in chilli is coded by the CaChi 2 gene. In this study, we crossed susceptible with resistant chilli cultivars, analysed the F 1 resistance response against pathogenic F. oxysporum , and analysed the level of CaChi 2 gene expression in the F 1 . Data were collected using disease severity index (DSI) determination and gene expression analysis by qRT-PCR (quantitative Reverse Transcriptase Polymerase Chain Reaction). Results showed that the DSI of F 1 was not significantly different from the resistant ancestor. The relative CaChi 2 expression level of F 1 was higher than the susceptible ancestor but not significantly different from the resistant ancestor. We concluded that the F 1 can be categorised as resistant to F. oxysporum , and the CaChi 2 gene is involved in the molecular defense response.

Resistance Response of Chilli (Capsicum annuum L.) F1 to Fusarium oxysporum Involves Expression of the CaChi2 Gene