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. 2015 Dec;31(4):428-32.
doi: 10.5423/PPJ.NT.05.2015.0074. Epub 2015 Dec 30.

Pathotypes of Bacterial Spot Pathogen Infecting Capsicum Peppers in Korea

Khin Pa Pa Wai  1 , Muhammad Irfan Siddique  1 , Hwang-Sung Mo  1 , Hee Ju Yoo  1 , Si-Eun Byeon  1 , Yoonhyuk Jegal  1 , Alebel A Mekuriaw  1 , Byung-Soo Kim  1
Affiliations

Pathotypes of Bacterial Spot Pathogen Infecting Capsicum Peppers in Korea

Khin Pa Pa Wai et al. Plant Pathol J. 2015 Dec.

Abstract

Sixty-seven isolates of bacterial spot pathogen (Xanthomonas spp.) collected from six provinces of Korea were tested for the identification of their pathotypes and determination of their distribution throughout Korea in an effort to genetically manage the disease. Near isogenic lines of Early Calwonder (Capsicum annuum) pepper plants carrying Bs1 , Bs2 and Bs3 , and PI235047 (C. pubescens) were used as differential hosts. Race P1 was found to be predominant, followed by race P7, and races P3 and P8 were also observed. This is the first report of races P7 and P8 in Korea. The races P7 and P8 were differentiated from the former races P1 and P3, respectively, on the basis of their ability to elicit hypersensitive reactions to PI235047.

Keywords: Capsicum annuum; Capsicum pubescens; Xanthomonas spp; race; resistance.

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Figures

Fig. 1
Fig. 1
Hypersensitive (HR) and susceptible (Sus) reaction to infiltration of bacterial spot pathogen. Hypersensitive reaction 24 h (A) and 48 h, (B) post infiltration; susceptible reaction 48 h, (C) and 72 h, (D) post infiltration showing wet clear lesion with water-soaked margin. HR lesions on PI235047 carrying Bs4 gene formed in reaction to race P1 and P3, (E) and non-hypersensitive reaction to race P7 and P8, (F) 1 week post infiltration.
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