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Summary Topic 8 Photoreceptors in plants
Edexcel Biology Topic 8 Photoreceptors in plants
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Photoreceptors in plantsPhytochrome -
flavering +
germination
short
day plants-flower when low
light
S.I units
Long day plants -
flower when
high light
Day neutral-flower irrespective of day length
Photoperiodism
↳ The recognised by
have
day lenghmorphoprological
is the plants and
effect
Phytochrone red and
phytochrome for red
Pr-650 wavelengt
PEr-730 wavelength
(beyond visual spectrum)
Prabsorbs red
light during the
day
↳
changes it to Pfr
-> In he dark .
Pfr absorbs for red and converts
it to red
↳ slow dark reversion
PFr is he critical active version
time
night important
Short plants low PFr concentration
day need
↳ - hours 17 night
day
PFr
Long day plants need
high concentration
↳ 17 hous night and 7
daylight
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