The effects of combined treatment with an elicitor (lipopolysaccharide) and a signaling molecule (salicylic acid) on the disease resistance of wild-type (Col-0) and mutant Arabidopsis thaliana L. plants have been compared. The mutant lines used were jin1 (with impaired jasmonate signaling), npr1 (lacking expression of pathogen-dependent PR genes), and NahG (expressing an active bacterial salicylate hydroxylase transgene). The lipopolysaccharide was isolated from a saprophytic strain (8614) of Pseudomonas aeruginosa bacteria. Treatment of A. thaliana seeds with a composite preparation (lipopolysaccharide and salicylic acid–SA) increased the resistance of seedlings to a subsequent infection by the pathogenic 9096 strain of P. aeruginosa bacteria. The protective effect was more pronounced in jin1 mutant seedlings, which was indicative of the possible compensation of jasmonate signaling impairment due to activation of the SA-dependent signaling pathway. We concluded that a preparation composed of an elicitor and a signaling molecule could affect regulatory mechanism functioning in a plant cell and, in particular, compensate for the absence of a certain signaling pathway by activating another.
Cytology and Genetics – Springer Journals
Published: Jun 4, 2018
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