Abstract
We examined the effect of macroalgal polysaccharides ι- and λ-carrageenan, which differ in sulfation, on Arabidopsis resistance to the necrotropic fungal pathogen Sclerotinia scleortiorum. Pretreatment of Arabidopsis with highly sulfated λ-carrageenan induced resistance to S. sclerotiorum resulting in smaller leaf lesions; by contrast, the less sulfated ι-carrageenan enhanced susceptibility. λ-carrageenan induced resistance correlated with increased expression of jasmonic acid related genes AOS, PDF1.2 and PR3. Further, λ-carrageenan increased the oxalase oxidase activity in planta. The λ-carrageenan induced resistance in the salicylic acid deficient mutant ics1, but did not rescue the susceptibility of jar1 plants suggesting that λ-carrageenan induced resistance is independent of salicylic acid. The difference in the bioactivity of carrageenans is due, at least partly, to differences in the degree of sulfation.
Published Version
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