Abstract
Low temperature treatment of dark-grown seedlings of Arabidopsis thaliana results in a rapid increase in the amount of mRNAs encoding for the major polypeptides of the light-harvesting complex of photosystem II (Lhcb1 genes). This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts, indicating that low temperature differentially regulates the expression of the Arabidopsis Lhcb1 gene family in the dark. A 1.34 kb fragment of the Lhcb1*3 promoter is sufficient to confer low temperature regulation to a reporter gene in transgenic Arabidopsis etiolated seedlings, suggesting that the regulation is occurring at the transcriptional level. The cold-induced accumulation of Lhcb1*3 mRNA is not part of a general response to stressful conditions since no accumulation is detected in response to water stress, anaerobiosis or salt stress. The amount of Lhcb1*3 mRNA decrease in response to exogenous abscisic acid (ABA) suggesting that this phytohormone acts as a negative regulator. Moreover, the accumulation of Lhcb1*3 mRNAs in cold-treated ABA deficient etiolated seedlings is higher than that of wild-type and ABA insensitive etiolated seedlings, indicating that low temperature regulation of Lhcb1*3 is not mediated by ABA.
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Claims 10
Claim · model-written summary
Low temperature rapidly increased Lhcb1 mRNA in dark grown Arabidopsis seedlings.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Organ / stage
- dark-grown seedlingse0
- Treatment
- Low temperature treatmente0
- Gene
- Lhcb1 genese0
- Outcome
- amount of mRNAse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low temperature treatment of dark-grown seedlings of Arabidopsis thaliana results in a rapid increase in the amount of mRNAs encoding for the major polypeptides of the light-harvesting complex of photosystem II (Lhcb1 genes).”
Claim · model-written summary
The cold induced mRNA increase was transient and mainly Lhcb1*3.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- Lhcb1*3e0
- Outcome
- accumulation of Lhcb1*3 transcriptse0
- Direction
- increasee0
- Qualifier
- transiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts”
t0“Arabidopsis Lhcb”
Claim · model-written summary
A 1.34 kb Lhcb1*3 promoter fragment conferred cold regulation to a reporter gene.
- Taxon
- ArabidopsisArabidopsise0
- Organ / stage
- etiolated seedlingse0
- Gene
- Lhcb1*3e0
- Outcome
- confer low temperature regulation to a reporter genee0
- Value
- 1.34 kbe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 1.34 kb fragment of the Lhcb1*3 promoter is sufficient to confer low temperature regulation to a reporter gene in transgenic Arabidopsis etiolated seedlings”
Claim · model-written summary
The authors infer that cold regulation of Lhcb1*3 occurs at transcription.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- Lhcb1*3e1
- Outcome
- regulation is occurring at the transcriptional levele0
- Qualifier
- transcriptional levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that the regulation is occurring at the transcriptional level.”
t0“Arabidopsis Lhcb”
e1“This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts”
Claim · model-written summary
Water stress did not induce Lhcb1*3 mRNA accumulation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- water stresse0
- Gene
- Lhcb1*3e1
- Outcome
- accumulatione0
- Direction
- no accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no accumulation is detected in response to water stress, anaerobiosis or salt stress.”
t0“Arabidopsis Lhcb”
e1“This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts”
Claim · model-written summary
Anaerobiosis did not induce Lhcb1*3 mRNA accumulation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- anaerobiosise0
- Gene
- Lhcb1*3e1
- Outcome
- accumulatione0
- Direction
- no accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no accumulation is detected in response to water stress, anaerobiosis or salt stress.”
t0“Arabidopsis Lhcb”
e1“This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts”
Claim · model-written summary
Salt stress did not induce Lhcb1*3 mRNA accumulation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- salt stresse0
- Gene
- Lhcb1*3e1
- Outcome
- accumulatione0
- Direction
- no accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no accumulation is detected in response to water stress, anaerobiosis or salt stress.”
t0“Arabidopsis Lhcb”
e1“This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts”
Claim · model-written summary
Exogenous ABA decreased Lhcb1*3 mRNA.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- exogenous abscisic acid (ABA)e0
- Gene
- Lhcb1*3e0
- Outcome
- amount of Lhcb1*3 mRNAe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of Lhcb1*3 mRNA decrease in response to exogenous abscisic acid (ABA)”
t0“Arabidopsis Lhcb”
Claim · model-written summary
Cold treated ABA deficient seedlings accumulated more Lhcb1*3 mRNA than wild type and ABA insensitive seedlings.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ABA deficiente0
- Organ / stage
- etiolated seedlingse0
- Outcome
- accumulation of Lhcb1*3 mRNAse0
- Direction
- highere0
- Comparator
- wild-type and ABA insensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of Lhcb1*3 mRNAs in cold-treated ABA deficient etiolated seedlings is higher than that of wild-type and ABA insensitive etiolated seedlings”
t0“Arabidopsis Lhcb”
Claim · model-written summary
The authors infer cold regulation of Lhcb1*3 is not mediated by ABA.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- Lhcb1*3e0
- Outcome
- low temperature regulation of Lhcb1*3e0
- Qualifier
- not mediated by ABAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating that low temperature regulation of Lhcb1*3 is not mediated by ABA.”
t0“Arabidopsis Lhcb”
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