20. Signals from Sunlight Flashcards
(42 cards)
photomorphogenesis
effect of light on plant development and growth
photoreceptors
detect and interpret light signals, initiate signal transduction pathways which ultimately trigger developmental responses
3 types of photoreceptors
phototropins
cryptochromes
phytochromes
which photoreceptors respond to blue light?
phototropins and cryptochromes
which photoreceptors respond to red light?
phytochromes
which photoreceptors would be most likely to detect light in the 400-500 nm wavelength range?
cryptochromes and phototropins
which photoreceptors would be most likely to detect light in the 650-720 nm wavelength range?
phytochromes
phytochromes are mostly used for:
photoperiodism
photoperiodism
the timing of plant processes in relation to the year
cryptochromes are primarily used for:
plant developement and photomorphogenesis, de-etiolation
phototropins are primarily used for:
phototropism and chloroplast relocation
in the stem, phototropins will be more active on the ___ side
sunny
in a stem, phototropins will be less active on the ___ side
shady
more active phototropins on the ___ side of the stem cause concentration of ____ on the shady side, leading to ____ of cells. This is called ___
sunny ; auxin ; elongation ; positive phototropism
etiolation
stems kept in the dark will grow long in search of light and lack chlorophyll
once it is exposed to light it will focus on leaf development
bending towards the light is is a ___ light response
blue
high light activates phototrpins to ___ stomata
close
which photoreceptor is most important for stomatal operature?
phototropins
which photoreceptor is most important for chloroplast relocation?
phototropins
which photoreceptor is most important for photoperiodism?
phytochromes
which photoreceptor is most important for de-etiolation?
cryptochrome
what is the most reliable trigger for photoreceptors?
length of day
short day and long day plants are actually sensing night or day length?
night length
