This is the first report on identification of the most suitable reference genes for RT-qPCR quantification of miRNA and mRNA in tobacco response to the prevalent recombinant potato virus Y (PVY) strains PVY, PVY and the newly identified PVY-NTN. Of 10 tested genes, the expression levels of neIF5C, nU2af and nPP2A were the most stable in samples taken from non-inoculated, mock-inoculated, and infected plants at three days post-inoculation (dpi) and 14 dpi. While the homologues of eIF5 were most stably expressed in tobacco in this study and in potato in our previous study (Yin et al., 2021) following inoculation with the same three PVY strains, the homologues of other two genes PP2A and U2af were stably expressed only in tobacco but unstable in potato. The tobacco homologue of PP2A, which was the most stably expressed one in tobacco interaction with PVY, PVY and PVY-NTN strains in this study, was the least stable one in tobacco interaction with the non-recombinant PVY strain in a previous study (Baek et al., 2017). This study provides evidence on the influence of host species on expression of housekeeping genes and points out virus strain as a new factor influencing expression stability of reference gene. Caution should be taken when choosing reference genes in gene expression study in Solanaceae hosts response to different PVY strains.
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| http://dx.doi.org/10.1016/j.gene.2023.147261 | DOI Listing |
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