<abstract xmlns="http://www.w3.org/1999/xhtml">

Salicylic acid (SA) plays an important role in protecting plants from biotic stresses. <italic>Lelliottia amnigena</italic> is a newly identified potato soft rot pathogen and there are no adequate studies on this soft rot pathogen. Therefore, this paper focussed on the effect of SA on the mechanism under which <italic>L. amnigena</italic> causes potato soft rot. <italic>L. amnigena</italic> was examined and detected to secrete pectinase, proteases, pectin lyase and cellulase, which are the most important pathogenic enzymes involved in the production of plant diseases. Sterilised healthy potato tubers were inoculated with 0.2 mL of <italic>L. amnigena</italic> suspension (3.69 CFU · mL−1 × 107 CFU · mL−1). After 24 h, 200 μL of four different SA concentrations (0.5 mM, 1.0 mM, 1.5 mM and 2.0 mM) were used to treat the tubers. Co-culture of <italic>L. amnigena</italic> and SA significantly reduced the activity of pectinase, protease, pectin lyase and cellulase by an average of 33.8%, 43.4%, 67.7% and 46.9%, across the four concentrations (0.5 mM, 1.0 mM, 1.5 mM and 2.0 mM), respectively, compared to the control. The average disease index was reduced by 54.7% across the four SA concentrations. Treatment with SA induced transcriptional levels of the superoxide dismutase, peroxide, catalase and glutathione S-transferase across the four levels by an average of 3.87, 3.25, 3.97 and 3.94-fold, respectively, compared to control. Based on our results, we could state that SA could reduce the activities of these extracellular enzymes produced by <italic>L. amnigena</italic> by modulating both enzymatic and non-enzymatic antioxidant activities and gene expression that induce natural resistance in plants against bacterial infections.
</abstract>

Salicylic acid (SA) plays an important role in protecting plants from biotic stresses. Lelliottia amnigena is a newly identified potato soft rot pathogen and there are no adequate studies on this soft rot pathogen. Therefore, this paper focussed on the effect of SA on the mechanism under which L. amnigena causes potato soft rot. L. amnigena was examined and detected to secrete pectinase, proteases, pectin lyase and cellulase, which are the most important pathogenic enzymes involved in the production of plant diseases. Sterilised healthy potato tubers were inoculated with 0.2 mL of L. amnigena suspension (3.69 CFU · mL−1 × 107 CFU · mL−1). After 24 h, 200 μL of four different SA concentrations (0.5 mM, 1.0 mM, 1.5 mM and 2.0 mM) were used to treat the tubers. Co-culture of L. amnigena and SA significantly reduced the activity of pectinase, protease, pectin lyase and cellulase by an average of 33.8%, 43.4%, 67.7% and 46.9%, across the four concentrations (0.5 mM, 1.0 mM, 1.5 mM and 2.0 mM), respectively, compared to the control. The average disease index was reduced by 54.7% across the four SA concentrations. Treatment with SA induced transcriptional levels of the superoxide dismutase, peroxide, catalase and glutathione S-transferase across the four levels by an average of 3.87, 3.25, 3.97 and 3.94-fold, respectively, compared to control. Based on our results, we could state that SA could reduce the activities of these extracellular enzymes produced by L. amnigena by modulating both enzymatic and non-enzymatic antioxidant activities and gene expression that induce natural resistance in plants against bacterial infections.

Salicylic acid effect on the mechanism of <italic>Lelliottia amnigena</italic> causing potato soft rot

Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province

Folia Horticulturae

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Salicylic acid effect on the mechanism of  causing potato soft rot

Salicylic acid (SA) plays an important role in protecting plants from biotic stresses. Lelliottia amnigena is a newly identified potato soft rot pathogen and...

Salicylic acid effect on the mechanism of Lelliottia amnigena causing potato soft rot

Article Category: Original Article

Published Online: Dec 30, 2021

Page range: 376 - 389

Received: Jul 29, 2021

Accepted: Nov 29, 2021

DOI: https://doi.org/10.2478/fhort-2021-0029

Keywords
antioxidant enzymes, disease, extracellular enzymes, pathogen, gene expression

© 2021 Richard Osei et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Salicylic acid effect on the mechanism of Lelliottia amnigena causing potato soft rot

Article Category: Original Article

Published Online: Dec 30, 2021

Page range: 376 - 389

Received: Jul 29, 2021

Accepted: Nov 29, 2021

DOI: https://doi.org/10.2478/fhort-2021-0029

Keywordsantioxidant enzymes, disease, extracellular enzymes, pathogen, gene expression

© 2021 Richard Osei et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
antioxidant enzymes, disease, extracellular enzymes, pathogen, gene expression