biology

Passion fruit woodiness virus

Passion fruit woodiness 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 Passion fruit woodiness virus rather than just read about it. In short: Passion fruit woodiness virus (PWV) is a plant virus in the genus Potyvirus and the virus family Potyviridae. Like other members of the genus Potyvirus, PWV is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made for a single viral encoded protein.

Key takeaways

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

Reference excerpt

Passion fruit woodiness virus (PWV) is a plant virus in the genus Potyvirus and the virus family Potyviridae. Like other members of the genus Potyvirus, PWV 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 745 nm in length. This virus is transmitted by at least two species of aphids (Myzus persicae and Aphis gossypii ) in a non-persistent manner and by mechanical inoculation. There is no evidence that this virus is transmitted in the seed. Like other potyviruses, this virus produces viral inclusions called cylindrical inclusions. These inclusions can be diagnostic in Passiflora spp. (See #External links)

Symptoms This virus was named for the symptoms seen in the fruit of infected P. edulis plants. The fruit can be distorted in appearance and the edible part of the fruit becomes thick and hard or “woody”. The virus induces a severe mosaic, with rugosity and chlorotic ringspots in the leaves of P. edulis. Infected plants grow less vigorously and have a shorter life span than those without the virus infection. Because of its effect on the fruit and plant growth, PWV is considered one of the most economically important of the many viruses that have been found infecting Passiflora spp.

Geographic distribution and host range PWV was first reported from Australia in 1964 infecting Passiflora edulis It has since been reported from Central America, Taiwan, South Africa, and Brazil and in at least 10 other Passiflora species including P. suberosa, P. subpeltata, P. aurantia and Passiflora foetida. In 2009 it was found in Florida (USA) in Passiflora choconiana. Since then it has been diagnosed in P. sublanceolata, P.caerulea, and in three hybrids called “Blue Bouquet”, Passiflora x belotii and “Amethyst Star”. (All three hybrids are crosses where one of the parents is Passiflora caerulea.) A survey for viruses of Passiflora spp. in Florida, published in 1991, found no potyviruses infecting commercial plantings of Passiflora in Florida. This indicates that PWV has been introduced into Florida recently, probably by the importation of infected vegetative cuttings. Host range inoculations have shown this virus can also infect some cultivars of beans (Phaseolus vulgaris), cowpeas (Vigna unguiculata), and Macroptilium lathyroides. M. latyroides is a native of South America which has been introduced to several other countries including the United States (Florida and Hawaii ), India, Australia, and Africa.

References

External links These three links contain pictures of cylindrical inclusions found in Passiflora spp. from three different potyviruses known to infect this host. All three have been found in Florida:

Symptoms and Inclusions of Passionfruit woodiness virus in Passiflora sp. Symptoms and Inclusions of Passiflora chlorosis virus. Inclusions of Passionfruit mottle virus.

Worked examples

Example 1 — a first encounter with Passion fruit woodiness virus

Start with the simplest possible case. Write down what Passion fruit woodiness 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 Passion fruit woodiness 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 Passion fruit woodiness 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 Passion fruit woodiness virus

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

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

Frequently asked questions

What is Passion fruit woodiness virus in simple terms?

Why does Passion fruit woodiness 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 Passion fruit woodiness 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 Passion fruit woodiness virus.