A small scale ethylmethanesulfonate (EMS) mutation was used to obtain resistant mutant plants to bacterial canker disease caused by Clavibacter michiganensissubsp. michiganensis isolate 2 (Cmm2). Susceptible EBR3 tomato line (200) seeds were mutagenised with the chemical EMS. Of the constructed M2 population, 450 seedlings were inoculated with Cmm2. Among the tested M2 plants, 15 M2 plants, not affected by the bacterial pathogen, produced M3 family seeds. 10 seeds from each M3 family were re-inoculated with the Cmm2, M3-9 and M3-15 family plant did not segregate for resistance confirming their resistant phenotypes. The M3-9 and M3-15 family mutant plants were analyzed for secondary metabolites especially phenolics; chlorogenic acid, caffeic acid, p-coumaric acid, rutin hydrate, ferulic acid, quercetin, naringenin and caempherol level in high performance liquid chromatography (HPLC) system. The chlorogenic acid and rutin hydrate levels were increased in M3-9 and M3-15 family mutant plants than susceptible original EBR3 plants. The increased levels of phenolic substances could be associated with resistance phenotypes in the M3-9 and M3-15 mutants’ plants.
Key Words: Tomato, ethylmethanesulfonate mutagenesis, resistant mutants, bacterial canker.
Copyright © 2019 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0