BRAINCAKEShort Day Plants
Short day plants flower when the nights are longer than a critical length, in other words when they receive a long, uninterrupted dark period. In the UK they usually flower in late summer, autumn or winter. Examples include chrysanthemums, poinsettias, soya beans and the cocklebur (Xanthium).
How phytochrome controls flowering
In short day plants, Pfr inhibits flowering.
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Key terms in this lesson
- phytochrome
- A blue-green plant pigment existing in two interconvertible forms sensitive to red and far-red light, controlling responses such as flowering and germination.
More in Chemical Control
- Sensory Systems in Plants
- Phytochromes
- Photoperiodism
- Long Day Plants
- Day Neutral Plants
- Signal Detection
- Discovery
- Photomorphogenesis
All 30 lessons in Chemical Control · All Edexcel A-level Biology topics