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Open AccessArticle

Innovative RNAi Strategies and Tactics to Tackle Plum Pox Virus (PPV) Genome in Prunus domestica-Plum

1
Unite Mixte de Recherches 1332, INRA-Bordeaux, 33882 Villenave d’Ornon, CS 20032, France
2
Appalachian research Station, USDA-ARS, Kearneysville, WV 25443, USA
*
Author to whom correspondence should be addressed.
Plants 2019, 8(12), 565; https://doi.org/10.3390/plants8120565
Received: 18 October 2019 / Revised: 25 November 2019 / Accepted: 26 November 2019 / Published: 2 December 2019
(This article belongs to the Special Issue RNAs and Plant Disease Resistance)
We developed an innovative RNAi concept based on two gene constructs built from the capsid gene (CP) cistron of the Plum pox virus (PPV) genome. First, designated as amiCPRNA, a potential molecule interfering with PPV genome translation and the second one is the ami-siCPRNA to target viral genome translation and PPV RNA replication. Following the previous engineering of these constructs in an experimental herbaceous host, they were introduced into Prunus domestica (plum tree) genome. Previously propagated onto a susceptible rootstock, these clones were graft-inoculated with PPV. After four dormancy cycles, and consistent with our experience of PPV infection, some clones showed a common phenomenon of silencing that can differ between the detailed plant phenotypes. Three different phenotypes were developed by the amisiCPRNA clones. First, the high resistance character shown by the amisiCPRNA plum-7 that was similar to the resistance expressed by HoneySweet plum. Secondly, a recovery reaction was developed by the two other amisiCPRNA plum-3 and plum-4 that differed from the rest, characterized as susceptible clones, among these were the amiCPRNA plums. Having assessed the behavior of these plums versus the herbaceous host accumulating the similar form of RNAi: ami-, si-, and ami-siRNA, challenging assays in perennials consistently reflect the natural context of viral genome targeting.
Keywords: Prunus domestica; RNAi; silencing; resistance; recovery; plum pox virus stability Prunus domestica; RNAi; silencing; resistance; recovery; plum pox virus stability
MDPI and ACS Style

Ravelonandro, M.; Scorza, R.; Briard, P. Innovative RNAi Strategies and Tactics to Tackle Plum Pox Virus (PPV) Genome in Prunus domestica-Plum. Plants 2019, 8, 565.

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