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Pathotypes of Bacterial Spot Pathogen Infecting Capsicum Peppers in Korea
Khin Pa Pa Wai,Muhammad Irfan Siddique,모황성,유희주,변시은,제갈윤혁,Alebel A. Mekuriaw,김병수 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.4
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.
Khin Pa Pa Wai,이재무,모황성,김병수 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.3
Pepper accessions that were selected for resistance to bacterial wilt were evaluated for their resistance to two strains (Rs004 and Rs005) in 2010 and three strains (Rs005, Rs006, and Rs010) in 2011 of the bacterial wilt pathogen, Ralstonia solanacearum. KC00121, KC00355, KC00359, KC01051, KC01052, KC01260, KC01261, and KC01263 showed a similar level of resistance as MC4 (KC00350), the worldly known source of resistance. Nuclear genotypes of restorer-of-fertility locus for the cytoplasmic male sterility of the accessions were identified by crossing them to a cytoplasmic male sterile line, Punggok-A (Srfrf) and examining the male fertility of the resultant F1 plants. KC00355, KC00359, KC01051, KC01052, KC01260, KC01261, and KC01263 were found to be maintainers of the Nrfrf genotype, whereas KC00121 was a restorer of fertility with the N(S)RfRf genotype.
Pathotypes of Bacterial Spot Pathogen Infecting Capsicum Peppers in Korea
Wai, Khin Pa Pa,Siddique, Muhammad Irfan,Mo, Hwang-Sung,Yoo, Hee Ju,Byeon, Si-Eun,Jegal, Yoonhyuk,Mekuriaw, Alebel A.,Kim, Byung-Soo The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.4
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 $Bs_1$, $Bs_2$ and $Bs_3$, 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.
New Sources of Resistance to Phytophthora capsici in Capsicum spp.
모황성,김소영,Khin Pa Pa Wai,Muhammad Irfan Siddique,유희주,김병수 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.1
Phytophthora blight caused by Phytophthora capsici is a dangerous disease in pepper that may devastate thecrop unless properly controlled when environmental conditions are favorable for outbreak of the disease and the varietiesgrown are susceptible. Although many pepper varieties released nowadays are resistant to the disease to a certain degree,continuous search for sources of resistance to the disease is necessary to cope with buildup of virulence and pathotypespecialization against the resistance genes deployed. Two hundred accessions of pepper germplasm received from theRDA gene bank, and 17 accessions received as sources of resistance to P. capsici from the University of Georgia (UG)were grown for seed increase in 2011. The accessions successfully increased and some others were tested for resistanceagainst a highly virulent strain (Pc018) of P. capsici isolated from an infected plant of a resistant commercial cultivarin Youngyang from 2011 to 2012. The PI201237-3, PI201237-4, PI566811-1, PI566811-2, PI593573-1, PI593573-3, andPI640532-1 of the UG accessions, KC00807-1 and KC01744 of C. chinense, KC00937 received from NationalHorticultural Research Institute in 2003, and KC01322 introduced from Laos in 2007 were resistant enough toexploit for breeding resistance. The resistance sources are new additions to the sources of resistance to P. capsici,tested to domestic strain of P. capsici and readily available in Korea.
First Report of Phytophthora Leaf Blight and Vine Rot of Kudzu (Pueraria lobata) in Korea
Byung-Soo Kim,Khin Pa Pa Wai,Muhammad Irfan Siddique,Hwang-Sung Mo,Hee Ju Yoo,Hee Suk Kim,Seung-Beom Hong 한국식물병리학회 2020 식물병연구 Vol.26 No.2
A disease causing leaf blight and vine rot was recognized on kudzu plants (Pueraria lobata) in Korea since 1991. A species of Phytophthora has been repeatedly isolated from the infected leaves. Identification in species level of the Phytophthora sp. remained unsolved. An isolate, KACC 47616 originally collected from Manchon Park in Daegu, has been kept in our laboratory. In 2013, three new isolates, KACC 47617 and KACC 47618 from Yeongyang and KACC 47619 from Gunwi in Gyeongbuk province, were collected and examined to classify up to species level by characterizing morphology, response to temperature and phylogenetic relationship. On the basis of morphological characters such as the nature of hyphal swelling, sporangia and sex organs, absence of chlamydospore production, optimum temperature for mycelial growth, and internal transcribed spacer rDNA and cytochrome oxidase subunit 1 sequence analysis of the pathogen, the causal fungus of kudzu plant was identified as Phytophthora asiatica.
Muhammad Irfan Siddique,Khin Pa Pa Wai,Hwang-Sung Mo,Hee-Ju Yoo,Kil-Su Jang,Su-Gyeong Jeon,Ji-Eun Hwang,Byung-Soo Kim 한국원예학회 2017 원예과학기술지 Vol.35 No.6
Over the last 25 years, a breeding line of pepper (Capsicum spp.) PVR Subi has been bred by the introduction of the Phytophthora capsici resistance found in pepper line PI201234 and the field resistance to viruses found in pepper accession KC00406 into a small-fruited, earlymaturing, and good-tasting land race, Subicho, in Yeongyang. In 2009, PVR Subi was crossed with a new version of Subi (New Subi) and an accession, KC01522, with mild and good dry fruit quality. This was done to meet growers’ demands for larger-fruited, open-pollinated local cultivars adapted to conditions in the Subi area of Yeongyang. Twenty-nine F5 and 37 F6 lines that developed from the two crosses were evaluated for resistance to P. capsici by pathogen inoculation at the seedling stage. Selected lines were grown to record horticultural characters in F5 and to analyze chemical quality components such as capsaicinoids, sugar and color in F6. Most of the breeding lines carried pathogen resistance comparable with the commercial resistant hybrid control cultivar, ‘Baerota’, and many lines were found to contain higher capsaicinoid and sugar levels, as well as ASTA color value, than the commercial control. All the breeding lines were identified as restorer-of-fertility lines with N(S)RfRf genotype, producing stable male fertile F1 plants in crosses with a cytoplasmic male sterile line (CMS). These breeding lines are promising as basic materials for selection of open-pollinated cultivars adapted to grow in Yeongyang, and as pollen parents for a hybrid seed production system using cytoplasmic male sterility.