Salicylic acid treatment and expression of an RNA-dependent RNA polymerase 1 transgene inhibit lethal symptoms and meristem invasion during tobacco mosaic virus infection in Nicotiana benthamiana
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作者单位:Wing-Sham Lee (1) (4) Shih-Feng Fu (1) (3) Zheng Li (1) Alex M. Murphy (1) Elizabeth A. Dobson (1) Laura Garland (1) Srinivasa Rao Chaluvadi (2) Mathew G. Lewsey (1) (5) Richard S. Nelson (2) John P. Carr (1)
1. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EA, UK 4. Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK 3. Department of Biology, National Changhua University of Education, 1 Jin-De Road, Changhua City, 500, Taiwan 2. Plant Biology Division, Samuel Roberts Noble Foundation, Inc, 2510 Sam Noble Parkway, Ardmore, OK, 73401, USA 5. Centre for AgriBioscience, Department of Animal, Plant and Soil Science, School of Life Science, La Trobe University, Bundoora, Australia
刊物主题:Plant Sciences; Agriculture; Tree Biology;
出版者:BioMed Central
ISSN:1471-2229
文摘
Background Host RNA-dependent RNA polymerases (RDRs) 1 and 6 contribute to antiviral RNA silencing in plants. RDR6 is constitutively expressed and was previously shown to limit invasion of Nicotiana benthamiana meristem tissue by potato virus X and thereby inhibit disease development. RDR1 is inducible by salicylic acid (SA) and several other phytohormones. But although it contributes to basal resistance to tobacco mosaic virus (TMV) it is dispensable for SA-induced resistance in inoculated leaves. The laboratory accession of N. benthamiana is a natural rdr1 mutant and highly susceptible to TMV. However, TMV-induced symptoms are ameliorated in transgenic plants expressing Medicago truncatula RDR1.