Abstract
Transgenic potato plants of Solanum tuberosum cultivar Vales Sovereign were generated that expressed fused, tandem, 200 bp segments derived from the capsid protein coding sequences of potato virus Y (PVY strain O) and potato leafroll virus (PLRV), as well as the cylindrical inclusion body coding sequences of potato virus A (PVA), as inverted repeat double-stranded RNAs, separated by an intron. The orientation of the expressed double-stranded RNAs was either sense–intron–antisense or antisense–intron–sense RNAs, and the double-stranded RNAs were processed into small RNAs. Four lines of such transgenic potato plants were assessed for resistance to infection by PVY-O, PLRV, or PVA, all transmitted by a natural vector, the green-peach aphid, Myzus persicae. Resistance was assessed by the absence of detectable virus accumulation in the foliage. All four transgenic potato lines tested showed 100 % resistance to infection by either PVY-O or PVA, but variable resistance to infection by PLRV, ranging from 72 to 96 % in different lines. This was regardless of the orientation of the viral inserts in the construct used to generate the transgenic plants and the gene copy number of the transgene. This demonstrates the potential for using tandem, fused viral segments and the inverted-repeat expression system to achieve multiple virus resistance to viruses transmitted by aphids in potato.
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This study was supported by grant number RDA-PJ009568022013 from the Next Generation BioGreen21 Program of the Rural Development Administration, Republic of Korea.
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Chung, B.N., Yoon, JY. & Palukaitis, P. Engineered resistance in potato against potato leafroll virus, potato virus A and potato virus Y. Virus Genes 47, 86–92 (2013). https://doi.org/10.1007/s11262-013-0904-4
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DOI: https://doi.org/10.1007/s11262-013-0904-4