The reaction of near-isogenic lines of flax to the rust fungus Melampsora lini. II. Biochemical studies |
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| Authors: | M R El-Gewely W E Smith N Colotelo |
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| Institution: | (1) Department of Biology, McGill University, Montreal, Quebec, Canada;(2) Department of Genetics, University of Alberta, Edmonton, Alberta, Canada;(3) Department of Plant Science, University of Alberta, Edmonton, Alberta, Canada;(4) Present address: Higher Institute of Cotton Affairs, Saba Pacha, Alexandria, Egypt |
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| Abstract: | The nature of resistance to rust fungus Melampsora lini (Pers.) Lev. was studied in two near-isogenic lines of flax, the susceptible Redwing (rr) and the immune S-66-53 (RR). Proteins of theses lines were immunologically and electrophoretically similar. Hydrolytic enzymes which release phenolic moities, i.e.,  -glucosidase and esterase(s), and phenol-oxidizing enzymes, i.e., peroxidase and polyphenol oxidase(s), did not appear to be involved in resistance or susceptibility as controlled by the R locus. Catalase activity was found to be higher in younger tissues of Redwing than in S-66-53 or their immune F1 hybrid (Rr). Older tissues in both lines, whether inoculated or not, did not show any detectable catalase activity. A hypothesis to explain the genetic control of resistance and susceptibility in these lines before and after inoculation is suggested.This work has been supported by the National Research Council of Canada. |
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| Keywords: | host-parasite interaction flax rust genetic control resistance |
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