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Title 

Systemic induction of the small antibacterial compound in the leaf exudate during benzothiadiazole-elicited systemic acquired resistance in pepper

Authors 

Boyoung LeeYong-Soon ParkH S YiChoong-Min Ryu

Publisher 

Han Rim Won Publishing Company

Issue Date 

2013

Citation 

Plant Pathology Journal, vol. 29, no. 3, pp. 350-355

Keywords 

BenzothiadiazoleLeaf exudatePepperSystemic acquired resistanceXanthomonas axonopodis

Abstract 

Plants protect themselves from diverse potential pathogens by induction of the immune systems such as systemic acquired resistance (SAR). Most bacterial plant pathogens thrive in the intercellular space (apoplast) of plant tissues and cause symptoms. The apoplastic leaf exudate (LE) is believed to contain nutrients to provide food resource for phytopathogenic bacteria to survive and to bring harmful phytocompounds to protect plants against bacterial pathogens. In this study, we employed the pepper-Xanthomonas axonopodis system to assess whether apoplastic fluid from LE in pepper affects the fitness of X. axonopodis during the induction of SAR. The LE was extracted from pepper leaves 7 days after soil drench-application of a chemical trigger, benzothiadiazole (BTH). Elicitation of plant immunity was confirmed by significant up-regulation of four genes, CaPR1, CaPR4, CaPR9, and CaCHI2, by BTH treatment. Bacterial fitness was evaluated by measuring growth rate during cultivation with LE from BTH-or water-treated leaves. LE from BTH-treatment significantly inhibited bacterial growth when compared to that from the water-treated control. The antibacterial activity of LE from BTH-treated samples was not affected by heating at 100 °C for 30 min. Although the antibacterial molecules were not precisely identified, the data suggest that small (less than 5 kDa), heat-stable compound(s) that are present in BTH-induced LE directly attenuate bacterial growth during the elicitation of plant immunity.

ISSN 

1598-2254

Link 

http://dx.doi.org/10.5423/PPJ.NT.02.2013.0018

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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