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Broad Bean Wilt Virus (BBWV) is a plant pathogenic virus belonging to the genus Fabavirus within the family Secoviridae (subfamily Comovirinae). First described by Stubbs in 1947, BBWV has since been recognized as one of the most economically important legume viruses worldwide, affecting not only broad bean (Vicia faba L.) but also a wide range of horticultural and ornamental crops. The virus derives its name from the characteristic wilting symptoms it induces in infected broad bean plants, a condition that can lead to severe yield losses and significant economic damage across many growing regions.
Figure 1.Broad Bean Wilt Virus. (Wang X, 2023)
Based on serological and molecular studies, BBWV isolates are classified into two distinct groups: Broad bean wilt virus 1 (BBWV-1) and Broad bean wilt virus 2 (BBWV-2). Although they share similar genome structures and functions, the nucleotide sequence identity between them is limited to 39%-67%. Phylogenetic analyses have confirmed that BBWV-1 and BBWV-2 are separate species within the genus Fabavirus, a classification originally proposed on the basis of double immunodiffusion tests and subsequently validated by molecular data. BBWV was originally included in the genus Comovirus, but fabaviruses are serologically unrelated to members of that genus and are distinguished by their transmission mode: fabaviruses are transmitted by aphids, whereas comoviruses are transmitted by beetles. In common with other genera in the subfamily Comovirinae, BBWV is characterised by its bipartite genome encapsidated in icosahedral particles, with each genome segment producing a polyprotein that is proteolytically processed into functional proteins.
Particle Morphology. BBWV virions are isometric (icosahedral), non-enveloped particles approximately 25-30 nm in diameter. The virus particle preparations contain two single-stranded RNA species, each encapsidated separately into distinct particle types: RNA1 (approximately 5,957-6,000 nucleotides) is encapsidated into B (bottom) particles, while RNA2 (approximately 3,500-3,600 nucleotides) is encapsidated into M (middle) particles. Virions are composed of 25% nucleic acid (M component) or 35% nucleic acid (B component), with the 3' terminus of each RNA possessing a poly(A) tract and the 5'terminus probably carrying a genome-linked protein (VPg). BBWV particles are composed of two distinct coat protein polypeptides: a large coat protein (L-CP) of molecular mass 41-45 kDa and a small coat protein (S-CP) of molecular mass 23-27 kDa. Both coat proteins are translated from the RNA2 polyprotein and subsequently released by proteolytic cleavage. Genome Organization. The BBWV genome is bipartite, consisting of two positive-sense single-stranded RNA molecules designated RNA1 and RNA2, both of which are required for infectivity. Each RNA is translated into a single polyprotein, which is then processed by a viral protease into functional proteins in a series of steps.
Host Range. BBWV has an exceptionally wide host range, one of the broadest among plant viruses. The virus has been reported in natural infections of 180 species belonging to 41 plant families, making it a significant threat to diverse agricultural and ornamental crops worldwide. The main host families include Apiaceae (carrot, celery), Brassicaceae (cabbage, mustard), Fabaceae (broad bean, pea, soybean), and Solanaceae (pepper, tomato, eggplant). BBWV has been reported in natural infections across Africa, Asia, Europe, North America, South America, and Oceania.
In host-range studies, a Syrian isolate systemically infected 59 out of 87 plant species tested, demonstrating the promiscuous nature of the virus. The four BBWV-1 isolates studied infected broad bean, tomato, pepper and Nicotiana benthamiana, whereas none of them infected cucumber, common bean and melon. Infectivity ranged from 40% to 60% in tomato and from 75% to 95% in pepper, whereas it reached 100% in broad bean and N. benthamiana for the four BBWV-1 isolates.
Symptoms and Damages. BBWV-induced symptoms vary considerably depending on the host species, virus isolate, and infection timing. Representative symptoms include:
BBWV is transmitted by aphids in a non-persistent (non-circulative) manner. In non-persistent transmission, the virus is acquired and inoculated within seconds to minutes of aphid feeding, and the vector does not retain the virus for more than a few hours. The virus is carried on the stylet tips of the aphid and does not enter the vector's haemocoel. Several aphid species serve as vectors, with Myzus persicae (peach-potato aphid) and Aphis gossypii (cotton aphid) being the most efficient. In Syria, the virus was transmitted non-persistently by four aphid species naturally prevalent in the region, but most efficiently by M. persicae, with infection rates of 60–90%.
| Key Molecular Targets | Details |
| Mechanical Transmission | BBWV is readily transmissible by mechanical inoculation of sap, meaning that it can spread through contaminated hands, tools, and farming equipment during routine agricultural operations such as pruning, harvesting, and transplanting. This characteristic contributes to the rapid spread of the virus within and between fields. |
| Seed Transmission | Seed transmission of BBWV is considered limited. The virus has only shown possible seed transmission in faba beans through artificial inoculation, with reported seed-transmission rates of 0.4–0.6% in experimental settings. It is not known to be common in nature, and seed is generally not considered a significant pathway for long-distance dissemination. |
| Geographic Distribution | BBWV has a global distribution and has been reported in over 40 countries across all inhabited continents, including Egypt, Ethiopia, Sudan, Tanzania, Tunisia, China, India, Japan, Korea, Syria, Turkey, across Europe, the United States, Australia, New Zealand, and Argentina. In surveys conducted in West Asia and North Africa, BBWV was detected in 8 out of 127 samples from Egypt, 38 out of 485 from Sudan, 38 out of 385 from Syria, and 23 out of 138 from Tunisia. |
Broad Bean Wilt Virus (BBWV), comprising the two distinct species BBWV-1 and BBWV-2, is a widespread and economically significant pathogen affecting over 180 plant species across 41 families. Its bipartite genome, icosahedral particles, and non-persistent transmission by aphids contribute to its epidemiological success and global distribution. Recent molecular advances, including complete genome sequencing, functional characterization of the multifunctional VP37 protein, and insights into reassortment as a key evolutionary driver—have substantially deepened our understanding of BBWV biology, host interactions, and silencing suppression mechanisms. Accurate diagnosis via ELISA, RT-PCR, and next-generation sequencing underpins effective surveillance, quarantine enforcement, and seed certification.
Reference
| Cat. No. | Product Name | Size | Species Reactivity | Application | Detection Method | |
| DEIAPV99 | Broad Bean Mottle Virus (BBMV) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
| DEIAPV100 | Broad bean stain virus (BBSV) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
| DEIAPV101 | broad bean true mosaic virus (BBTMV) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
| DEIAPV102 | Broad bean wilt virus 1,2 (BBWV-1,2) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
| DEIAPV103 | Broad bean wilt virus-1 (BBWV-1) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
| DEIAPV104 | Broad bean wilt virus-2 (BBWV-2) ELISA Kit | 5000T | N/A | Qualitative, Quantitative | N/A | Inquiry |
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