Citrus Psorosis Virus: Current Insights on a Still Poorly Understood Ophiovirus

[en] Citrus psorosis was reported for the first time in Florida in 1896 and was confirmed as a graft-transmissible disease in 1934. Citrus psorosis virus (CPsV) is the presumed causal agent of this disease. It is considered as a type species of the genus Ophiovirus, within the family Aspiviridae. CPsV genome is a negative single-stranded RNA (-ssRNA) with three segments. It has a coat protein (CP) of 48 kDa and its particles are non-enveloped with naked filamentous nucleocapsids existing as either circular open structures or collapsed pseudo-linear forms. Numerous rapid and sensitive immuno-enzymatic and molecular-based detection methods specific to CPsV are available. CPsV occurrence in key citrus growing regions across the world has been spurred the establishment of the earliest eradication and virus-free budwood programs. Despite these efforts, CPsV remains a common and serious challenge in several countries and causes a range of symptoms depending on the isolate, the cultivar, and the environment. CPsV can be transmitted mechanically to some herbaceous hosts and back to citrus. Although CPsV was confirmed to be seedborne, the seed transmission is not efficient. CPsV natural spread has been increasing based on both CPsV surveys detection and specific CPsV symptoms monitoring. However, trials to ensure its transmission by a soil-inhabiting fungus and one aphid species have been unsuccessful. Psorosis disease control is achieved using CPsV-free buds for new plantations, launching budwood certification and indexing programs, and establishing a quarantine system for the introduction of new varieties. The use of natural resistance to control CPsV is very challenging. Transgenic resistance to at least some CPsV isolates is now possible in at least some sweet orange varieties and constitutes a promising biotechnological alternative to control CPsV. This paper provides an overview of the most remarkable achievements in CPsV research that could improve the understanding of the disease and lead the development of better control strategies

Disciplines :

Phytobiology (plant sciences, forestry, mycology...)

Author, co-author :

Belabess, Zineb; Centre Régional de la Recherche Agronomique (CRRA), Oujda - Morocco

Sagouti, Tourya; Faculté des Sciences et Techniques de Mohammedia - Morocco

Rhallabi, Naima; Faculté des Sciences et Techniques de Mohammedia - Morocco

Tahiri, Abdessalem; Ecole Nationale d’Agriculture de Meknès - Morocco

Massart, Sébastien ; Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs

Tahzima, Rachid ; Université de Liège - ULiège > Terra

Lahlali, Rachid; Ecole Nationale d’Agriculture de Meknès - Morocco

Jijakli, Haissam ; Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs

Language :

English

Title :

Citrus Psorosis Virus: Current Insights on a Still Poorly Understood Ophiovirus

Publication date :

27 August 2020

Journal title :

Microorganisms

eISSN :

2076-2607

Publisher :

MDPI, Basel, Switzerland

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.mdpi.com/2076-2607/8/8/1197

Available on ORBi :

since 03 September 2020

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