biology

Mungbean yellow mosaic virus

Mungbean yellow mosaic virus is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mungbean yellow mosaic virus rather than just read about it. In short: Mungbean yellow mosaic virus (MYMV) is a plant pathogenic virus of the family Geminiviridae. Of the various viral diseases inflicting legume crops, Mungbean Yellow Mosaic disease is one of the most destructive and widely distributed.

Key takeaways

Mungbean yellow mosaic virus belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mungbean yellow mosaic virus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mungbean yellow mosaic virus from memory before moving on to harder problems.

Reference excerpt

Mungbean yellow mosaic virus (MYMV) is a plant pathogenic virus of the family Geminiviridae. Of the various viral diseases inflicting legume crops, Mungbean Yellow Mosaic disease is one of the most destructive and widely distributed. The disease has been reported from various countries.

Region-specific outbreaks Yellow mosaic disease of many legumes in India and other South Asian countries is transmitted by geminiviruses belonging to the family Geminiviridae and genus Begomovirus. Four species, Mungbean yellow mosaic virus (MYMV), Mungbean yellow mosaic India virus (MYMIV), Dolichos yellow mosaic virus (DYMV) and Horsegram yellow mosaic virus (HYMV), are known to cause yellow mosaic disease in different leguminous species. Mungbean yellow mosaic India virus (MYMIV) is a bipartite Begomovirus from the family Geminiviridae and is reported to be the causative agent of the disease in India.

Symptoms Mungbean yellow mosaic disease is characterized by a bright yellow mosaic on the leaves of infected plants and causes significant losses to mungbean (Vigna radiata) crops in India.

Host species Geminiviruses infect a wide variety of crop plants, devastating some of the economically important plants ranging from dicots to monocots. These lead to major agro-economical losses worldwide, and are subjects of immense concern. The most affected leguminous crops by MYMIV are pigeon peas (Cajanus cajan), soybeans (Glycine max), mat beans (Phaseolus aconitifolius), common beans (P. aureus), French beans (P. vulgaris), and black lentils (Vigna mungo).

Disease transmission Yellow mosaic disease of many legumes is often transmitted by silverfly (Bemisia tabaci).

Viral structure These are plant viruses which have single-stranded circular DNA genomes encoding genes that diverge in both directions from a virion strand origin of replication (i.e. geminivirus genomes are ambisense). According to the Baltimore classification, they are considered to be class II viruses. The genome can either be a single component between 2500 and 3100 nucleotides, or, in the case of some begomoviruses, two similar-sized components each between 2600 and 2800 nucleotides. They have elongated, geminate capsids with two incomplete T=1 icosahedra joined at the missing vertex. The capsids range in size from 18–20 nm in diameter with a length of about 30 nm. Geminiviruses constitute a large family of phytopathogens (Geminiviridae). The family geminiviridae have been classified into four genera, namely Begomovirus, Curtovirus, Topocuvirus and Mastrevirus, depending on their genomes, mode of transmission and host range. Geminiviridae are transmitted by white flies, scientifically known as Bamesia tabacci. The genus begomoviridae generally comprises bipartite (two components, namely DNA- ‘A’ and ‘B’) genome, which replicates via rolling circle (RCR) model with the help of few viral and several host factors. Mungbean yellow mosaic India virus (MYMIV) is a representative of the genus begomovirus / Begomoviridae, which is prevalent in northern part of Indian subcontinent causing yellow mosaic disease (YMD). MYMIV possesses bipartite ssDNA genomes named as DNA-A and DNA-B, both being ~2.7 kb in size. Both components share a common region (CR) of about 200 bp containing the important cis-elements for viral DNA transcription and rolling circle replication (RCR).

References

External links ICTVdB - The Universal Virus Database: Mung bean yellow mosaic virus Family Groups - The Baltimore Method Archived 2013-03-30 at the Wayback Machine

Worked examples

Example 1 — a first encounter with Mungbean yellow mosaic virus

Start with the simplest possible case. Write down what Mungbean yellow mosaic virus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mungbean yellow mosaic virus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mungbean yellow mosaic virus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mungbean yellow mosaic virus

In research: Mungbean yellow mosaic virus appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mungbean yellow mosaic virus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mungbean yellow mosaic virus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Begomovirus, Soybean diseases, Viral plant pathogens and diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Mungbean yellow mosaic virus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mungbean yellow mosaic virus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mungbean yellow mosaic virus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mungbean yellow mosaic virus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mungbean yellow mosaic virus in simple terms?

Why does Mungbean yellow mosaic virus matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mungbean yellow mosaic virus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mungbean yellow mosaic virus.