photoperiodism
Let an agent explain photoperiodism and its mechanisms in plants and animals, classify responses, relay applications in agriculture and horticulture, and distinguish it from other light and temperature responses.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain photoperiodism and its mechanisms in plants and animals, classify responses, relay applications in agriculture and horticulture, and distinguish it from other light and temperature responses.
The physiological response of organisms to the length of day or night, by which plants time flowering, bud set and dormancy and animals time breeding, migration, moulting and diapause; photoperiodism is mediated by light receptors such as phytochrome and cryptochrome and by circadian clocks, and plants are classed as short-day, long-day or day-neutral by their flowering response.
What it is for: Timing seasonal events by day length.
It can be explain the response and mechanisms; classify plants by photoperiodic response; relay agricultural applications; distinguish from related responses.
Distinguishing features
Measures night length in plants
Mediated by photoreceptors and circadian clock
Seasonal timing in plants and animals
Manipulated in horticulture
What it looks like
Not a visible object; seen in seasonal flowering, breeding and dormancy.
Physical character
discovered: 1920 year - Garner and Allard
How it is recognised
Response to day or night length
Short-day, long-day and day-neutral classes
Phototropism and vernalisation are other responses
Related models
is a kind of - in registry terms
depends on - the internal clock
is mediated by - in plants
controls - in many plants
In practice
Families and kinds
short-day photoperiodism
long-day photoperiodism
day-neutral responses
red and blue light responses via phytochrome and cryptochrome
circadian entrainment by photoperiod
animal photoperiodism in breeding and migration
Identifiers
Gene Ontology GO:0009648 photoperiodism
Standards and regulation
No regulation; horticultural lighting practice follows industry guidance
Failure modes and hazards
Confusing day length with light intensity
Light pollution disrupting animal photoperiodism
Crop failures from wrong latitude or planting date
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Concept What photoperiodism is.
Science.
Definition
Definition and classes.
Definition
Definition.
- What is photoperiodism, and how are plants classed by response? definition
- Is the response photoperiodic or due to another cue such as temperature? boundary
Mechanism
Mechanism.
Mechanism
Mechanism.
- How do photoreceptors and the circadian clock measure night length and trigger flowering? definition
- Which entry fits phytochrome or cryptochrome? action
Animals Animal photoperiodism.
Science.
Seasonal
Seasonal timing.
Seasonal
Seasonal.
- How do animals use day length to time breeding, migration and diapause? provenance
- Which entry fits seasonal breeding? action
Mechanism
Animal mechanism.
Mechanism
Mechanism.
- What role do melatonin and the pineal gland play? provenance
- Which references are standard? provenance
Apply Applications.
Practice.
Horticulture
Horticulture.
Horticulture
Horticulture.
- How is photoperiod manipulated to control flowering in greenhouse crops? provenance
- Which entry fits greenhouse lighting? action
Agriculture
Crops and latitude.
Agriculture
Agriculture.
- How does photoperiod sensitivity affect crop adaptation and breeding? provenance
- Which entry fits plant breeding? action
Context History and environment.
Context.
History
History.
History
History.
- How was photoperiodism discovered and its mechanism worked out? provenance
- Which entry fits the history of plant physiology? action
Environment
Light pollution and climate.
Environment
Environment.
- How do artificial light and climate change interact with photoperiodic timing, with findings attributed? provenance
- Which entry fits light pollution? action
What the second pass must settle
- Should plant and animal photoperiodism be separate entries?
- How should Gene Ontology terms be linked?
- The registry entry has merged aliases naming ontology terms; should they be split off?