biology

Meloidogyne brevicauda

Meloidogyne brevicauda 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 Meloidogyne brevicauda rather than just read about it. In short: Meloidogyne brevicauda is a plant-parasitic nematode. It is also called tea root-knot nematode, mature tea nematode or Indian root-knot nematode.

Key takeaways

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

Reference excerpt

Meloidogyne brevicauda is a plant-parasitic nematode. It is also called tea root-knot nematode, mature tea nematode or Indian root-knot nematode. It is a member of the root-knot nematodes, which was identified by C. A. Loos in 1953 in Sri Lanka.

Description Female M. brevicauda has a narrow procorpus, a large metacorpus, a large glandular region that has one dorsal and two subventral esophageal gland lobes. Two large nucleated esophago-intestinal cells are at the dorsal base of the metacorpus junction with the intestine. The labial disc and lips are prominent and protrude from the regular body contour. The perineal pattern appears with high squared dorsal and ventral arches without prominent lateral lines. Male M. brevicauda has a slit-like stoma surrounded by six small, pore-like openings of the inner labial sensilla. The head annulations are absent. The lips are set off from the body annulations because the diameter of the lips is larger than that of the first body annule. The first body annule is also narrower than the remaining body annules. The shape of the head of males of M. brevicauda is very different from that of most root-knot males. The labial disc of most males of Meloidogyne is fused with the medial lips, but in M. brevicauda, the labial disc is distantly separated from them by a deep groove. Other than that, most root-knot males have a large head annule that may be further divided by irregular or incomplete annulations. Males of M.brevicauda do not have a head region, the lips are immediately adjacent to the first body annule. The tail is marked by acrescent-shaped fold in the cuticle surrounding the posterior portion of the cloacal opening.

Life cycle This root-knot nematode is sedentary endoparasitic nematode. Second-stage juveniles (J2) penetrate host roots where they establish a specialized feeding site (giant cells) in the stele. As J2 develop, they cause root swellings and become swollen females. Females rupture root cortex and sometime protrude with the egg masses from the root surface. J2 emerge from the egg masses and migrate in the soil.

Distribution Azerbaijan; Fujian Province, China; Tamil Naduand West Bengal, India and Sri Lanka

Hosts Camellia sinensis (tea) and Crocus sativus (saffron)

Symptoms Above-ground symptoms on tea are pale, dull leaves or abnormal leaf fall. Infestations are more apparent in bushes recovering from pruning. Severely attacked bushes may fail to recover. The infected roots have large, characteristic galls, many of which have pinhole pits.

Management Use nematode-free planting material. Apply nematicides in the planting hole in areas with a history of nematode infestation. Avoid susceptible clones. Use soil amendments such as refuse tea, compost, castor oil cake and neem oil cake. Uproot severely damaged mature tea and replacing it with a nematode trap crop before replanting.

Impact Although M. brevicauda causes severe damage to tea, there has been no quantification of the damage caused. The risk posed by M. brevicauda is limited due to its limited distribution and host range (tea and saffron).

References

External links Nemaplex, University of California - Meloidogyne brevicauda http://nematode.unl.edu/pest63.htm http://www.plantwise.org/KnowledgeBank/Datasheet.aspx?dsid=33234

Worked examples

Example 1 — a first encounter with Meloidogyne brevicauda

Start with the simplest possible case. Write down what Meloidogyne brevicauda 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 Meloidogyne brevicauda 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 Meloidogyne brevicauda 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 Meloidogyne brevicauda

In research: Meloidogyne brevicauda 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 Meloidogyne brevicauda 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: Meloidogyne brevicauda is common in secondary-school and first-year university syllabi. It links to neighbouring topics Agricultural pest nematodes, Nematodes described in 1953, Tea diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Meloidogyne brevicauda 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 Meloidogyne brevicauda in 20 minutes

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

Frequently asked questions

What is Meloidogyne brevicauda in simple terms?

Meloidogyne brevicauda is a plant-parasitic nematode. It is also called tea root-knot nematode, mature tea nematode or Indian root-knot nematode.

Why does Meloidogyne brevicauda 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 Meloidogyne brevicauda?

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 Meloidogyne brevicauda.