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http://dx.doi.org/10.7235/hort.2013.13017

Occurrence of Leaf Mold Pathogen Fulvia fulva Isolates Infecting Tomato Cf-9 Cultivars in Korea  

Lee, Ji Hyun (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Park, Myung Soo (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Kim, Jin-Cheol (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Jang, Kyoung Soo (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Choi, Yong Ho (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Kim, Heung Tae (Department of Plant Medicine, Chungbuk National University)
Choi, Gyung Ja (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
Publication Information
Horticultural Science & Technology / v.31, no.6, 2013 , pp. 740-747 More about this Journal
Abstract
Leaf mold symptoms were found on commercial tomato cultivars carrying the Cf-9, a resistance gene to leaf mold pathogen Fulvia fulva in 2012 at Buyeo, Chungnam in Korea. Fifteen-fungal isolates were obtained from four Cf-9 cultivars of tomato including 'Cutie', 'otaerangdia', 'Unicorn' and 'Rapito'. Due to their same morphological appearances and colony color, nine isolates were selected and identified as F. fulva based on molecular analysis of the internal transcribed spacer rDNA sequence. Pathogenicity of the 15 isolates on five commercial cultivars carrying Cf-4, Cf-5, and Cf-9 were tested. All the isolates showed strong pathogenicity on Cf-9 cultivars, 'Cutie' and 'Dotaerangdia', and Cf-5 cultivar, 'Yoyocaptain'. In contrast, on Cf-4 cultivar, 'Superdotaerang', five isolates were virulent and the other isolates were not. In addition, two fungal isolates, infecting Cf-9 cultivar and non-infecting Cf-4 cultivar, were selected and their pathogenicity was tested on 17 commercial cultivars reported as tomato having Cf-9 resistance gene. Among them, 15 cultivars were susceptible and 2 cultivars were resistant. It is likely that the two cultivars include other resistance gene. To our knowledge, this is the first report on the occurrence of Cf-9 infecting F. fulfva strains in Korea.
Keywords
Cf gene; Cladosporium fulvum; pathogenicity; race; tomato leaf mold;
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