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Plant and Cell Physiology, 2001, Vol. 42, No. 3 340-347
© 2001 Oxford University Press

Mapping the Virus and Host Genes Involved in the Resistance Response in Cucumber Mosaic Virus-Infected Arabidopsis thaliana

Hideki Takahashi ,1,5, Masashi Suzuki2, Keiko Natsuaki3, Takuma Shigyo4, Kumiko Hino4, Tohru Teraoka4, Daijiro Hosokawa4 and Yoshio Ehara1

1 Department of Life Science, Graduate School of Agricultural Science, Tohoku University, Sendai, 981-8555 Japan 2 Laboratory of Plant Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657 Japan 3 Faculty of International Agriculture and Food Studies, Tokyo University of Agriculture, Tokyo, 156-8502 Japan 4 Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-0054 Japan

A yellow strain of cucumber mosaic virus (CMV) [CMV(Y)] induces a resistance response characterized by inhibition of virus systemic movement with development of necrotic local lesions in the virus-inoculated leaves of Arabidopsis thaliana ecotype C24. In this report, the avirulence determinant in the virus genome was defined and the resistance gene (RCY1) of C24 was genetically mapped. The response of C24 to CMV containing the chimeric RNA3 between CMV(Y) and a virulent strain of CMV indicated that the coat protein gene of CMV(Y) determined the localization of the virus in the inoculated leaves of C24. The RCY1 locus was mapped between two CAPS markers, DFR and T43968, which were located in the region containing genetically defined disease resistance genes and their homologues. These results indicate that the resistance response to CMV(Y) in C24 is determined by the combination of the coat protein gene and RCY1 on chromosome 5.

5 Corresponding author: E-mail, takahash@bios.tohoku.ac.jp; Fax, +81-22-717-8659.


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