biology

Peanut mottle virus

Peanut mottle 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 Peanut mottle virus rather than just read about it. In short: 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.

Key takeaways

Peanut mottle 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 Peanut mottle virus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Peanut mottle virus from memory before moving on to harder problems.

Reference excerpt

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.

Host species Besides peanuts, the virus is known to infect soybeans (Glycine max), French beans (Phaseolus vulgaris), peas (Pisum sativum), and various weed species of Cassia. Since 1964 it has been identified in East Africa and north-east Australia (in bean) and possible Venezuela, Japan, Malaysia and Bulgaria. Given the fact that PeMoV is seed transmissible in peanuts, the virus could occur anywhere peanuts are grown. In the United States, for example, a survey done in 1975 found the virus in all states where peanuts were grown.

Symptoms The symptoms of the virus in peanuts appear as irregular dark islands on young leaves. The symptoms are not as clear on older leaves and thus can be easily missed even when the virus is in epidemic proportions in the field. In infected plant cells, the virus makes characteristic potyvirus cylindrical inclusions. that are visible in the light microscope with proper staining.

Disease control A study of the spread of the virus in Georgia showed that the virus moved from infected peanut plants to nearby soybean fields and was only present in soybeans in areas where peanuts were also grown. Thus, the recommended approach to control the virus in peanuts and other susceptible hosts such as soybeans is the planting of PeMoV-free seed. PeMoV was reported for the first time in 2007 to infect Rhizoma peanuts (A. glabrata) in Georgia. The plant is propagated by cuttings and is a perennial crop. To avoid spread, growers of the perennial plant have to maintain virus free stock and destroy infected fields. If the virus spreads in perennial peanuts in the Southern United States, the plant has the potential to become a reservoir of the virus and increase its spread to field peanut and soybean via aphid transmission.

References

External links ICTVdB - The Universal Virus Database: Peanut mottle virus Archived 2007-07-08 at the Wayback Machine Descriptions of Plant Viruses: Peanut mottle virus Family Groups - The Baltimore Method Archived 2013-03-30 at the Wayback Machine

Illustrations

Worked examples

Example 1 — a first encounter with Peanut mottle virus

Start with the simplest possible case. Write down what Peanut mottle 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 Peanut mottle 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 Peanut mottle 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 Peanut mottle virus

In research: Peanut mottle 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 Peanut mottle 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: Peanut mottle virus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Potyviruses, Soybean diseases, Viral plant pathogens and diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Peanut mottle 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 Peanut mottle virus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peanut mottle 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 Peanut mottle virus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peanut mottle virus in simple terms?

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.

Why does Peanut mottle 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 Peanut mottle 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 Peanut mottle virus.