Commonalities of Molecular Response in Tomato Plants against Parasitic Nematodes
2021
Plants trigger several defence mechanisms during biotic stress conditions, and the activation of pathogenesis-related genes may help plants defend against nematode infection. Members of the plant-parasitic nematode genus, Meloidogyne, cause damage to numerous plants in the world. However, host molecular responses against several nematode species are not fully understood. Therefore, this study aimed to determine the expression of Osmotin-like pathogenesis-related-gene 5 (PR5), acidic glucanase specific class pathogenesis-related-gene 2 (PR2), and chitinase pathogenesis-related gene 3 (PR3) during infection by three different nematodes species: Meloidogyne incognita, Meloidogyne javanica, and Meloidogyne chitwoodi in tomato (Solanum lycopersicum) plants. Pathogen-related genes PR2 and PR5 are related to salicylic acid dependent resistance, and PR3 is related to jasmonic acid dependent resistance. Results revealed that increased levels of expression of plants give a quick response to species of M. incognita, M. javanica and M. chitwoodi infections at 3 dpi after infection by expression of the PR5 gene. The relative gene expression of PR2 was low at 14 and 21 dpis after infection of M. incognita, M. javanica and M. chitwoodi in tomato tissues. The relative PR3 gene expression was reached at the utmost level at 3 and 7 dpi after infection of Meloidogyne incognita. In conclusion, the occurrence of commonalities of host molecular response in terms of the expression of pathogenesis-related genes following infection of tomato plants by all three nematode species suggests a similarity of nematode recognition at some time points and a commonality of the systemic plant defence response.
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