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. 2021 May 13;10(5):1187. doi: 10.3390/cells10051187

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The discovery of RdDM in viroid-infected tobacco plants. (A) Schematic representation of the PSTVd³³³ containing a 26-nucleotide deletion compared to a full length PSTVd³⁵⁹. (B) Nt-di-PSTVd³³³ plants are free of methylation. (C) Upon viroid infection, Nt-di-PSTVd³³³ plants exhibit dense RdDM. (D) The crossing of Nt-di-PSTVd³³³ with Nt-di-PSTVd³⁵⁹ induced both cis and trans RdDM in CG, CHG and CHH contexts. Upon the segregation of the PSTVd³⁵⁹ infectious transgene, the PSTVd³³³ progeny maintains CG methylation for at least two generations.