biology

Puccinia hordei

Puccinia hordei 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 Puccinia hordei rather than just read about it. In short: Puccinia hordei is a species of rust fungus. A plant pathogen, it can cause leaf rust of barley, also known as brown rust of barley.

Key takeaways

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

Reference excerpt

Puccinia hordei is a species of rust fungus. A plant pathogen, it can cause leaf rust of barley, also known as brown rust of barley. It was originally found on the dry leaves of Hordeum vulgare in Germany.

Taxonomy

Synonyms Aecidium ornithogaleum Dicaeoma anomalum Dicaeoma holcinum Dicaeoma hordei Nielsenia hordei Nigredo hordeina Arthur Nigredo hordei (Kuntze) Arthur Pleomeris holcina Pleomeris hordei Pleomeris simplex Pleomeris triseti Puccinia anomala Puccinia fragosoi Puccinia holcina Puccinia hordei Puccinia hordei-murini Puccinia loliina Puccinia recondita f.sp. holci Puccinia recondita f.sp. holcina Puccinia recondita f.sp. triseti Puccinia recondita f.sp. tritici Puccinia schismi Puccinia schismi var. loliina Puccinia simplex Puccinia straminis var. simplex Puccinia triseti Puccinia vulpiae-myuri Puccinia vulpiana Uromyces hordei

Host resistance At the time of Johnston et al., 2013's discovery of severe susceptibility in Golden Promise, this was considered to be the most susceptible variety in the world. Soon thereafter however, Yeo et al., 2014 found SusPtrit was slightly worse. These results alter the meaning of such a basic term as "fully susceptible" to brown rust. In 2007 several resistance genes for this pathogen including receptor-like kinase (RLK), WIR1, WIR1 homologues, peroxidases, superoxide dismutase and thaumatin were found in barley.

References

Illustrations

Worked examples

Example 1 — a first encounter with Puccinia hordei

Start with the simplest possible case. Write down what Puccinia hordei 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 Puccinia hordei 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 Puccinia hordei 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 Puccinia hordei

In research: Puccinia hordei 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 Puccinia hordei 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: Puccinia hordei is common in secondary-school and first-year university syllabi. It links to neighbouring topics Barley diseases, Fungal plant disease stubs, Fungal plant pathogens and diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Puccinia hordei 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 Puccinia hordei in 20 minutes

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

Frequently asked questions

What is Puccinia hordei in simple terms?

Puccinia hordei is a species of rust fungus. A plant pathogen, it can cause leaf rust of barley, also known as brown rust of barley.

Why does Puccinia hordei 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 Puccinia hordei?

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 Puccinia hordei.