Abstract
Correct operation of the plant circadian clock is crucial for optimal growth and development. Recent evidence has shown that the plant clock is tissue specific and potentially hierarchical, implying that there are signalling mechanisms that can synchronise the clock in different tissues. Here, I have addressed the mechanism that allows the shoot and root clocks to be synchronised in light:dark cycles but not in continuous light. Luciferase imaging data from 2 different Arabidopsis accessions with 2 different markers show that the period of the root clock is much less sensitive to blue light than to red light. Decapitated roots were imaged either in darkness or with the top section of root tissue exposed to light. Exposure to red light reduced the period of the root tissue maintained in darkness, whereas exposure to blue light did not. The data indicate that light can be piped through root tissue to affect the circadian period of tissue in darkness. I propose that the synchronisation of shoots and roots in light:dark cycles is achieved by light piping from shoots to roots.
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Claims 5
Claim · model-written summary
The Arabidopsis root clock period was much less sensitive to blue than red light.
- Taxon
- Arabidopsis
Arabidopsise0 - Treatment
- blue lighte0
- Outcome
- period of the root clocke0
- Direction
- much less sensitivee0
- Comparator
- red lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Luciferase imaging data from 2 different Arabidopsis accessions with 2 different markers show that the period of the root clock is much less sensitive to blue light than to red light.”
t0“A rabidopsis”
Claim · model-written summary
Red light exposure reduced the circadian period of root tissue kept in darkness.
- Taxon
- A rabidopsist0
- Treatment
- red lighte0
- Outcome
- period of the root tissuee0
- Direction
- reducede0
- Qualifier
- maintained in darknesse0
Not reportedComparator
Verbatim
e0“Exposure to red light reduced the period of the root tissue maintained in darkness”
t0“A rabidopsis”
Claim · model-written summary
Blue light exposure did not reduce the circadian period of root tissue kept in darkness.
Not reportedComparator
Verbatim
e0“whereas exposure to blue light did not.”
t0“A rabidopsis”
Claim · model-written summary
Light piping through root tissue can affect the circadian period of tissue in darkness.
Verbatim
e0“light can be piped through root tissue to affect the circadian period of tissue in darkness.”
t0“A rabidopsis”
Claim · model-written summary
The author proposes shoot-to-root light piping as the basis of synchronisation in light:dark cycles.
Verbatim
e0“the synchronisation of shoots and roots in light:dark cycles is achieved by light piping from shoots to roots.”
t0“A rabidopsis”