science

Selfing syndrome

Selfing syndrome is a science 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 Selfing syndrome rather than just read about it. In short: Selfing syndrome refers to plants that are autogamous and display a complex of characteristics associated with self-pollination. The term was coined by Adrien Sicard and Michael Lenhard in 2011, but was first described in detail by Charles Darwin in his book “The Effects of Cross and Self Fertilisation in the Vegetable Kingdom” (1876), making note that the flowers of self-fertilizing plants are typically smaller and…

Key takeaways

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

Reference excerpt

Selfing syndrome refers to plants that are autogamous and display a complex of characteristics associated with self-pollination. The term was coined by Adrien Sicard and Michael Lenhard in 2011, but was first described in detail by Charles Darwin in his book “The Effects of Cross and Self Fertilisation in the Vegetable Kingdom” (1876), making note that the flowers of self-fertilizing plants are typically smaller and have little distance between reproductive organs.

Characteristics Plants that exhibit selfing syndrome typically possess reduced pigmentation and flower size, reduced herkogamy, and the lack of reward for pollinators. Differences between outcrossing species versus selfing species can be clearly distinguished in plants such as Collinsia grandiflora, an outcrossing species, and the selfing species Collinsia parviflora.

Life form of selfing species Plants exhibiting selfing syndrome are typically autogamous and display reduced pollen ovule (P/O) ratios, resulting in a smaller pollen count and a larger number of ovules. The reduction of flower size has been studied between the selfing species Capsella rubella and its closely related outcrossing relative Capsella grandiflora. The petals between the two species grow at the same rate, however, a decrease in the sterile apetela (SAP) protein activity due to variation in the SAP intron in C. rubella is responsible for reduced petal size. This is due to the smaller number of cells present in the petal and results in petals that are around 35% smaller than the petals of C. grandiflora. Along with reduced flower size, plants exhibiting selfing syndrome typically have reduced numbers of open flowers compared to those that outcross. Selfing plants have also been found to have a larger geographic range, close to two times larger range than plants that outcross and can also be found around 110 kilometers higher in latitude.

References

Illustrations

Worked examples

Example 1 — a first encounter with Selfing syndrome

Start with the simplest possible case. Write down what Selfing syndrome claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Selfing syndrome 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 Selfing syndrome 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 Selfing syndrome

In research: Selfing syndrome appears in science 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 Selfing syndrome 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: Selfing syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Plant reproduction, so understanding it makes those chapters shorter.
In everyday life: Look for Selfing syndrome 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 Selfing syndrome in 20 minutes

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

Frequently asked questions

What is Selfing syndrome in simple terms?

Why does Selfing syndrome matter?

Because it connects several science 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 Selfing syndrome?

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 Selfing syndrome.