| Sweet potato mild mottle virus | |
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Virus classification  | |
| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Orthornavirae |
| Phylum: | Pisuviricota |
| Class: | Stelpaviricetes |
| Order: | Patatavirales |
| Family: | Potyviridae |
| Genus: | Ipomovirus |
| Species: | Sweet potato mild mottle virus |
| Synonyms | |
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Sweet potato mild mottle virus (SPMMV) is a plant pathogenic virus of the family Potyviridae .
Sweet Potato Mild Mottle Virus (or SPMMV) has a large host range. This is uncommon for potyviruses, making SPMMV a divergent species of potyviruses. [1] SPMMV hosts include 45 different species in 14 different plant families. [2] The naturally occurring host, and namesake for the virus is Ipomoea batatas (sweet potato). Even though SPMMV is found naturally in sweet potato, scientists have been able to experimentally transmit the virus to different species including beets, sowbane, devil’s snare, makhmali, tomato, tobacco, petunia, and zinna. [3]
Some common symptoms seen in SPMMV hosts include mild leaf mottling, which is characterized by irregular patterns of marks, patches, spots, and streaks of different colors on host leaves. Also, stunting and dwarfing of the plant is common. [4] Some hosts even have venial chlorosis. [5] [6] Overall, plant growth is very poor in hosts with SPMMV. [2]
Sweet Potato Mild Mottle Virus is transmitted by Bemisia tabaci, which is the sweet potato whitefly. They are very small insects that suck in order to consume food. They are of the family Aleyrodidae of the order Homoptera. [7] The whitefly feeds on the sweet potato commonly. In order to feed on a host plant, whiteflies pierce the phloem of the plant with its mouth, and subsequently remove nutrients.[ citation needed ]
The more time that the insect feeds on the crop, the higher chance they have of acquiring the plant virus. This will make it easier for them to transmit the virus to another plant, as they are persistent, circulative vectors. [8] Whiteflies are mainly found in tropical areas, and have high populations in the warmer climates of the United States, Africa, and Australia. [7]
Although there is no concrete data yet on total yield loss of crops due to SPMMV, its effect is still very real to farmers. [4] Particularly, Sub-Saharan Africa has been affected by SPMMV. This region produces more than 7 million tons of sweet potato annually, which is about 5% of global production. According to the International Food Policy Research Institute, the sweet potato production is expected to double by 2020. [9] [ self-published source? ] Even though there has yet to be a large-scale outbreak of SPMMV in Africa, the disease still has the potential to destroy local farms that have dedicated their entire harvest to sweet potatoes.[ citation needed ]
Moreover, sweet potato is considered a food security crop for the area. It gives pretty reliable yields and is easily propagated on degraded soils. It is a great disaster recovery crop. It is also advantageous for poor households who depend on cultivating sweet potato crops for sale. [9] In general, sweet potato is a very important crop in this region of Africa, beyond the economic payoffs. Not only is it important for selling to buyers worldwide, it also is a reliable crop that for food daily. Rural Sub-Saharan African women grow sweet potatoes near their homes simply to feed their families.[ citation needed ]
New crops of sweet potatoes can be available for harvest as quickly as 3–4 months, making this an easy crop to sell for people of all economic backgrounds. With all of this in mind, SPMMV does not have to reach catastrophic, epidemic levels for poor, malnourished, local communities to feel its effect. If the disease were to effect a small families plot of sweet potatoes used to just feed themselves, the family may not be able to have a stable food supply until they are able to grow more. The spread of SPMMV ravishes crops that people all over heavily rely on to thrive in their communities. [10] [11]
Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. They comprise the family Aleyrodidae, the only family in the superfamily Aleyrodoidea. More than 1550 species have been described.
Potyviridae is a family of positive-strand RNA viruses that encompasses more than 30% of known plant viruses, many of which are of great agricultural significance. The family has 12 genera and 235 species, three of which are unassigned to a genus.
The silverleaf whitefly is one of several species of whitefly that are currently important agricultural pests. A review in 2011 concluded that the silverleaf whitefly is actually a species complex containing at least 40 morphologically indistinguishable species.
Potyvirus is a genus of positive-strand RNA viruses in the family Potyviridae. Plants serve as natural hosts. Like begomoviruses, members of this genus may cause significant losses in agricultural, pastoral, horticultural, and ornamental crops. More than 200 species of aphids spread potyviruses, and most are from the subfamily Aphidinae. The genus contains 190 species and potyviruses account for about thirty percent of all currently known plant viruses.
Begomovirus is a genus of viruses, in the family Geminiviridae. They are plant viruses that as a group have a very wide host range, infecting dicotyledonous plants. Worldwide they are responsible for a considerable amount of economic damage to many important crops such as tomatoes, beans, squash, cassava and cotton. There are 445 species in this genus.
Asparagus virus 1 (AV-1) is one of the nine known viruses that infects asparagus plants. It is a member of the genus Potyvirus in the family Potyviridae. Initially reported by G. L Hein in 1960, it causes no distinct symptoms in asparagus plants. The only known natural plant host is the asparagus. It is spread by aphid vectors, which means that aphids do not cause the AV-1, but they do spread it.
Bidens mottle virus (BiMoV) is a pathogenic plant virus in the plant virus family Potyviridae. BiMoV is a flexuous filamentous particle, 720 nm long, and belongs to the Potyviridae genus Potyvirus. Like other viruses in this genus, Bidens mottle virus is transmitted both mechanically by sap and by aphids in a stylet-borne fashion.
Maize dwarf mosaic virus (MDMV) is a pathogenic plant virus of the family Potyviridae. Depending on the corn plant’s growth stage, the virus can have severe implications to the corn plant’s development which can also result in economic consequences to the producer of the crop.
Peanut mottle virus(PeMoV) is a pathogenic plant virus of the family Potyviridae. As with other members of this virus family, PeMoV is a flexuous filamentous virus with particles 740–750 nm long. It is transmitted by several species of aphids and by mechanical inoculation. It was first given its name in 1965 when it was isolated from peanuts (Arachis hypogaea) in Georgia, United States. The virus was found to be seed transmitted in its host.
Pepper mottle virus (PepMoV) is a plant pathogenic virus in the genus Potyvirus and the virus family Potyviridae. Like other members of the Potyvirus genus, PepMV is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made for a single viral encoded protein. The virus is a filamentous particle that measures about 737 nm in length. Isolates of this virus has been completely sequenced and its RNA is 9640 nucleotides long. This virus is transmitted by several species of aphids in a nonpersitant manner and by mechanical inoculation.
Tomato yellow leaf curl virus (TYLCV) is a DNA virus from the genus Begomovirus and the family Geminiviridae. TYLCV causes the most destructive disease of tomato, and it can be found in tropical and subtropical regions causing severe economic losses. This virus is transmitted by an insect vector from the family Aleyrodidae and order Hemiptera, the whitefly Bemisia tabaci, commonly known as the silverleaf whitefly or the sweet potato whitefly. The primary host for TYLCV is the tomato plant, and other plant hosts where TYLCV infection has been found include eggplants, potatoes, tobacco, beans, and peppers. Due to the rapid spread of TYLCV in the last few decades, there is an increased focus in research trying to understand and control this damaging pathogen. Some interesting findings include the virus being sexually transmitted from infected males to non-infected females, and an evidence that TYLCV is transovarially transmitted to offspring for two generations.
Sugarcane mosaic virus (SCMV) is a plant pathogenic virus of the family Potyviridae. The virus was first noticed in Puerto Rico in 1916 and spread rapidly throughout the southern United States in the early 1920s. SCMV is of great concern because of the high economic impact it has on sugarcane and maize.
Sweet potato feathery mottle virus (SPFMV) is a member of the genus Potyvirus in the family Potyviridae. It is most widely recognized as one of the most regularly occurring causal agents of sweet potato viral disease (SPVD) and is currently observed in every continent except Antarctica. The number of locations where it is found is still increasing; generally, it is assumed that the virus is present wherever its host is. The virus has four strains that are found in varying parts of the world.
Sweet potato latent virus (SPLV), formerly designated as sweet potato virus N, was first reported from Taiwan. The virus has flexuous, filamentous particles of approximately 700-750 nm long and induces typical cylindrical inclusion proteins in the cytoplasm of infected cells. The experimental host range of SPLV is wider than that of sweet potato feathery virus (SPFMV), and it induces symptoms on some Chenopodium and Nicotiana species. SPLV is serologically related to, but distinct from SPFMV. Sequence comparison of the 3’-partial sequences showed that SPLV was a distinct species of the genus Potyvirus in the family Potyviridae. The virus is common in China and has also been found in Korea and Rwanda.
Ipomovirus is a genus of positive-strand RNA viruses in the family Potyviridae. Member viruses infect plants and are transmitted by whiteflies. The name of the genus is derived from Ipomoea – the generic name of sweet potato. There are seven species in this genus.
Maize lethal necrosis disease is a viral disease affecting maize (corn) predominantly in East Africa, Southeast Asia and South America, which was recognised in 2010. It is caused by simultaneous infection with two viruses, MCMoV and any of several Potyviridae.
Cassava brown streak virus is a species of positive-strand RNA viruses in the genus Ipomovirus and family Potyviridae which infects plants. Member viruses are unique in their induction of pinwheel, or scroll-shaped inclusion bodies in the cytoplasm of infected cells. Cylindrical inclusion bodies include aggregations of virus-encoded helicase proteins. These inclusion bodies are thought to be sites of viral replication and assembly, making then an important factor in the viral lifecycle. Viruses from both the species Cassava brown streak virus and Ugandan cassava brown streak virus (UCBSV), lead to the development of Cassava Brown Streak Disease (CBSD) within cassava plants.
Sweet potato leaf curl virus is commonly abbreviated SPLCV. Select isolates are referred to as SPLCV followed by an abbreviation of where they were isolated. For example, the Brazilian isolate is referred to as SPLCV-Br.
Elijah Miinda Ateka is a Professor of Plant Virology at the Jomo Kenyatta University of Agriculture and Technology. He is involved with the diagnosis and characterisation of the sweet potato virus and the cassava virus, and is part of the Cassava Virus Action Project (CVAP).
Carrot virus Y (CarVY) is a (+)ss-RNA virus that affects crops of the carrot family (Apiaceae), such as carrots, anise, chervil, coriander, cumin, dill and parsnip. Carrots are the only known crop to be infected in the field. Infection by the virus leads to deformed roots and discolored or mottled leaves. The virus is spread through insect vectors, and is currently only found in Australia.
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