biology

Milkweed yellows phytoplasma

Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma rather than just read about it. In short: Milkweed yellows phytoplasma is a strain of phytoplasma in the class Mollicutes, a class of bacteria distinguished by the absence of a cell wall. The phytoplasma strain is denoted by the acronym MW1.

Key takeaways

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

Reference excerpt

Milkweed yellows phytoplasma is a strain of phytoplasma in the class Mollicutes, a class of bacteria distinguished by the absence of a cell wall. The phytoplasma strain is denoted by the acronym MW1. Like all phytoplasmas, milkweed yellows phytoplasma is an obligate intracellular parasite, that is, it can not live outside of host cells. It spreads by means of an insect vector, the identity of which is unknown. In general, phytoplasmas spread via leafhoppers and other sap-sucking insects that transmit the pathogen from one host plant to another.

Taxonomy In 1994, two strains of phytoplasmas that infect the common milkweed Asclepias syriaca (denoted MW1 and MW2) were shown to be members of the X-disease group (16Sr group III). Milkweed yellows phytoplasma (MW1) was later found to be a 'Candidatus Phytoplasma pruni'-related strain of phytoplasma belonging to subgroup F (16SrIII-F). Other phytoplasmas in subgroup 16SrIII-F include Vaccinium witches' broom phytoplasma (VAC, VacWB) and potato purple top phytoplasma (AKpot7). As of November 2021, milkweed yellows phytoplasma has not been formally described.

Milkweed yellows

Milkweed yellows is an infectious disease of milkweeds caused by the milkweed yellows phytoplasma. Other diseases caused by pathogens in subgroup 16SrIII-F include Vaccinium witches' broom, potato purple top, and a greening disorder of Trillium grandiflorum and other Trillium species.

Hosts The common milkweed Asclepias syriaca and the periwinkle Catharanthus roseus are known plant hosts for milkweed yellows phytoplasma. The insect host species for milkweed yellows is not known.

See also Aster yellows Elm yellows Grapevine yellows

Bibliography Griffiths, H. M.; Gundersen, D. E.; Sinclair, W. A.; Lee, I.-M.; Davis, R. E. (1994). "Mycoplasmalike organisms from milkweed, goldenrod, and spirea represent two new 16S rRNA subgroups and three new strain subclusters related to peach X-disease MLOs". Can. J. Plant Pathol. 16 (4): 255–260. Bibcode:1994CaJPP..16..255G. doi:10.1080/07060669409500728.

References

External links "Milkweed yellows phytoplasma". The Plant Project. 5 September 2020. Retrieved 15 November 2021. Valiunas, D.; Alminaite, A.; Jomantiene, R.; Davis, R.E.; Maas, J.L. (2004). "Possible cause of European blueberry disease is related to North American milkweed yellows phytoplasma". Journal of Plant Pathology. 86 (2): 135–140. Retrieved 15 November 2021. Saccardo, Federica; Martini, Marta; Palmano, Sabrina; Ermacora, Paolo; Scortichini, Marco; Loi, Nazia; Firrao, Giuseppe (2012). "Genome drafts of four phytoplasma strains of the ribosomal group 16SrIII". Microbiology. 158 (11): 2805–2814. doi:10.1099/mic.0.061432-0. PMID 22936033.

Illustrations

Worked examples

Example 1 — a first encounter with Milkweed yellows phytoplasma

Start with the simplest possible case. Write down what Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma

In research: Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma 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: Milkweed yellows phytoplasma is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacterial plant pathogens and diseases, Mollicutes, Ornamental plant pathogens and diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma in 20 minutes

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

Frequently asked questions

What is Milkweed yellows phytoplasma in simple terms?

Milkweed yellows phytoplasma is a strain of phytoplasma in the class Mollicutes, a class of bacteria distinguished by the absence of a cell wall. The phytoplasma strain is denoted by the acronym MW1.

Why does Milkweed yellows phytoplasma 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 Milkweed yellows phytoplasma?

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 Milkweed yellows phytoplasma.