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http://dx.doi.org/10.4014/jmb.1510.10016

Screening Rice Cultivars for Resistance to Bacterial Leaf Blight  

Fred, Agaba Kayihura (Department of Food Security and Agricultural Development, College of Agriculture and Life Science, Kyungpook National University)
Kiswara, Gilang (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture and Life Science, Kyungpook National University)
Yi, Gihwan (Department of Farm Management, College of Agriculture and Life Science, Kyungpook National University)
Kim, Kyung-Min (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture and Life Science, Kyungpook National University)
Publication Information
Journal of Microbiology and Biotechnology / v.26, no.5, 2016 , pp. 938-945 More about this Journal
Abstract
Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most serious threats to rice production. In this study, screening of rice for resistance to BLB was carried out at two different times and locations; that is, in a greenhouse during winter and in an open field during summer. The pathogenicity of Xoo race K1 was tested on 32 Korean rice cultivars. Inoculation was conducted at the maximum tillering stage, and the lesion length was measured after 14 days of inoculation. Five cultivars, Hanareum, Namcheon, Samgdeok, Samgang, and Yangjo, were found to be resistant in both the greenhouse and open-field screenings. Expression of the plant defense-related genes JAmyb, OsNPR1, OsPR1a, OsWRKY45, and OsPR10b was observed in resistant and susceptible cultivars by qRT-PCR. Among the five genes tested, only OsPR10b showed coherent expression with the phenotypes. Screening of resistance to Xoo in rice was more accurate when conducted in open fields in the summer cultivation period than in greenhouses in winter. The expression of plant defense-related genes after bacterial inoculation could give another perspective in elucidating defense mechanisms by using both resistant and susceptible individuals.
Keywords
Bacterial leaf blight; rice; resistance; susceptibility; pathogenicity;
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