Allium is one of the largest monocotyledonous plant genera with around 950 species (Friesen et al., 2006), including species of great economic importance. The genus includes widely used vegetable crops such as garlic, onion, and several wild and ornamental species.For decades, pathogens have been a major constraint on Allium production, reducing yields, and affecting the quality and sustainability of global agriculture (Conci et al., 2003). Common vegetative propagation, poor sexual reproduction, especially in garlic, and the limited resistance sources in onion are the main barriers to the conventional breeding of these major Allium crops, making it hard to develop disease and vector-resistant varieties (Khandagale et al., 2020).Viruses are one of the major and economically important agricultural pathogens worldwide. In natural environments, viruses can rapidly adjust to changes in host genotypes after new host encounters
Allexivirus (Alphaflexiviridae) was first described in 1970 by Razvjazkina. Since then, Allexivirus species have been detected in many countries. Although this genus primarily infects plants in the Amaryllidaceae, other hosts include plants in the Fabaceae, Rosaceae and Orchidaceae. Thirteen Allexivirus species have been assigned. Eight of these infect Allium hosts, and these include: shallot virus X (ShVX), garlic virus A (GarV-A), garlic virus B (GarV-B), garlic virus C (GarV-C), garlic virus D (GarV-D), garlic virus E (GarV-E), garlic virus X (GarV-X), and garlic-mite filamentous virus (GarMbFV). Five have been described from non-Allium hosts, including blackberry virus E (BVE), vanilla latent virus (VLV), alfalfa virus S (AVS), Arachis pintoi virus (ApV), and Senna severe yellow mosaic virus (SSYMV). This review analyzes the taxonomic positions of the thirteen recognized species and four unassigned species (Allexivirus DS-2013/CZE isolate, shallot mite-borne latent virus (SMbLV), cassia mild mosaic virus (CaMMV), and papaya virus A (PaVA)). Based on the inspection of data, we have concluded that PaVA is an Allexivirus, DS-2013/CZE is an isolate of GarV-D, and SMbLV is an isolate of ShVX. Current knowledge of the host ranges, symptoms, genome structure and modes of transmission of these viruses is also summarized, and control measures employed against them are outlined.
The transmission characteristics of members of the genus Allexivirus to leek (Allium porrum L.) by its eriophyid mite vector, Aceria tulipae (Keifer), were studied. Prior to conducting transmission tests, colonies of nonviruliferous A. tulipae were established on healthy leek seedlings. A single A. tulipae transmitted the viruses with up to 50 % efficiency but transmission efficiency increased when > 10 mites per plant were used. Allexiviruses were acquired by A. tulipae after a minimum acquisition access period (AAP) of 30 minutes, whereas transmission tests suggest that a one hour inoculation access period (IAP) was needed for successful transmission. Allexiviruses were transmitted from garlic to leek plants by A. tulipae and mixed infections by more than one virus were observed. ShVX, GarV-A, -C, -D, and -B were detected in most inoculated plants, whereas other members of the genus (GarV-E, -X, and GarMbFV) were found only occasionally. None of the mites that originated from eggs deposited on infected plants transmitted allexiviruses, indicating that the viruses are not transmitted transovarially. No latent period was demonstrated. Taken together, these data suggest a semipersistent mode of transmission of Allexivirus members by A. tulipae. The output of this study will assist in the better management of the vector and the associated diseases.
The transmission characteristics of members of the genus Allexivirus to leek (Allium porrum L.) by its eriophyid mite vector, Aceria tulipae (Keifer), were studied. Prior to conducting transmission tests, colonies of nonviruliferous A. tulipae were established on healthy leek seedlings. A single A. tulipae transmitted the viruses with up to 50 % e ciency but transmission e ciency increased when > 10 mites per plant were used. Allexiviruses were acquired by A. tulipae after a minimum acquisition access period (AAP) of 30 minutes, whereas transmission tests suggest that a one hour inoculation access period (IAP) was needed for successful transmission. Allexiviruses were transmitted from garlic to leek plants by A. tulipae and mixed infections by more than one virus were observed. ShVX, GarV-A, -C, -D, and -B were detected in most inoculated plants, whereas other members of the genus (GarV-E, -X, and GarMbFV) were found only occasionally. None of the mites that originated from eggs deposited on infected plants transmitted allexiviruses, indicating that the viruses are not transmitted transovarially. No latent period was demonstrated. Taken together, these data suggest a semipersistent mode of transmission of Allexivirus members by A. tulipae. The output of this study will assist in the better management of the vector and the associated diseases.
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