Abstract
Expression of genes encoding the light-harvesting chlorophyll a/b binding proteins of photosystem II (Cab) in etiolated wheat seedlings is controlled by phytochrome and a circadian clock. Even photoconversion of <1% of phytochrome to its active form, which can be achieved by moonlight, induces the expression of the Cab genes, particularly that of the Cab-1 gene, in circadian fashion. Thus, this reaction shows the characteristics of a low and a very low fluence response. A single far-red light pulse given to an etiolated seedling is sufficient for a persistence of the circadian oscillation of the Cab-1 mRNA level for at least 100 h. Subsequent red (R) or long-wavelength far-red (RG9) light irradiations alter the free running rhythm. These observations indicate a change in sensitivity to phytochrome and/or a control by stable phytochrome. The latter hypothesis is supported by the observation that the level of Cab-1 mRNA is increased or decreased by a second R or RG9 light pulse, respectively.
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Claims 6
Claim · model-written summary
Photoconversion below 1% induced circadian Cab expression, especially Cab-1.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- photoconversion of <1% of phytochromee0
- Gene
- Cab-1e0
- Outcome
- expression of the Cab genese0
- Direction
- inducese0
- Value
- <1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even photoconversion of <1% of phytochrome to its active form, which can be achieved by moonlight, induces the expression of the Cab genes, particularly that of the Cab-1 gene, in circadian fashion”
e1“wheat seedlings”
Claim · model-written summary
One far-red pulse sustained Cab-1 mRNA oscillation for at least 100 h.
- Taxon
- wheatTriticum aestivume1
- Treatment
- A single far-red light pulsee0
- Gene
- Cab-1e0
- Outcome
- circadian oscillation of the Cab-1 mRNA levele0
- Value
- at least 100 he0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single far-red light pulse given to an etiolated seedling is sufficient for a persistence of the circadian oscillation of the Cab-1 mRNA level for at least 100 h”
e1“wheat seedlings”
Claim · model-written summary
Subsequent red light altered the free running rhythm.
- Taxon
- wheatTriticum aestivume1
- Treatment
- red (R)e0
- Outcome
- free running rhythme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequent red (R) or long-wavelength far-red (RG9) light irradiations alter the free running rhythm”
e1“wheat seedlings”
Claim · model-written summary
Subsequent long wavelength far-red light altered the free running rhythm.
- Taxon
- wheatTriticum aestivume1
- Treatment
- long-wavelength far-red (RG9)e0
- Outcome
- free running rhythme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequent red (R) or long-wavelength far-red (RG9) light irradiations alter the free running rhythm”
e1“wheat seedlings”
Claim · model-written summary
A second red pulse increased Cab-1 mRNA.
- Taxon
- wheatTriticum aestivume1
- Treatment
- a second Re0
- Gene
- Cab-1e0
- Outcome
- level of Cab-1 mRNAe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of Cab-1 mRNA is increased or decreased by a second R or RG9 light pulse, respectively”
e1“wheat seedlings”
Claim · model-written summary
A second RG9 pulse decreased Cab-1 mRNA.
- Taxon
- wheatTriticum aestivume1
- Treatment
- RG9 light pulsee0
- Gene
- Cab-1e0
- Outcome
- level of Cab-1 mRNAe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of Cab-1 mRNA is increased or decreased by a second R or RG9 light pulse, respectively”
e1“wheat seedlings”
The same questions in other papers
light · molecular: expression · Triticum aestivum (wheat)Positive and negative results
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