Abstract
ABSTRACT The role of changes in intracellular calcium ion concentration ([Ca 2+ ] i ) in low‐temperature signal transduction in plants has lately been supported by several studies. An analysis to determine whether the low‐temperature‐induced increase in cytosolic Ca 2+ concentration ([Ca 2+ ] cyt ) could be correlated with a downstream response such as gene expression was carried out. The induction of the low‐temperature‐regulated gene LTI78 was used as an end point marker of the signal transduction pathway. It was found that this gene is induced by very brief low‐temperature exposures and that the induction does not depend on a continuous exposure to low temperature. By altering the cooling rate, different patterns of the Ca 2+ response were obtained which could be correlated with different patterns of LTI78 induction. Furthermore, reducing the Ca 2+ transients by pre‐treatment with the Ca 2+ channel blocker La 3+ also led to a reduced level of gene induction. The results show that brief exposures to low temperature results in the onset of a signalling pathway that leads to the induction of gene expression. This indicates the involvement of changes in [Ca 2+ ] cyt in low‐temperature signalling leading to LTI78 expression but the presence of multiple signalling pathways is suggested.
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Claims 5
Claim · model-written summary
Brief low temperature exposures induced LTI78 without continuous cold exposure.
- Taxon
- Arabidopsis
Arabidopsist0 - Treatment
- very brief low‐temperature exposurese0
- Gene
- LTI78e1
- Outcome
- this gene is inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this gene is induced by very brief low‐temperature exposures and that the induction does not depend on a continuous exposure to low temperature”
t0“Arabidopsis”
e1“The induction of the low‐temperature‐regulated gene LTI78”
Claim · model-written summary
Different cooling rates produced different calcium response patterns correlated with LTI78 induction patterns.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- cooling ratee0
- Gene
- LTI78e0
- Outcome
- different patterns of LTI78 inductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By altering the cooling rate, different patterns of the Ca 2+ response were obtained which could be correlated with different patterns of LTI78 induction”
t0“Arabidopsis”
Claim · model-written summary
Calcium channel blocker pretreatment reduced calcium transients and gene induction.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- pre‐treatment with the Ca 2+ channel blocker La 3+e0
- Outcome
- gene inductione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing the Ca 2+ transients by pre‐treatment with the Ca 2+ channel blocker La 3+ also led to a reduced level of gene induction”
t0“Arabidopsis”
Claim · model-written summary
Brief cold exposure initiated a signaling pathway leading to gene expression.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- brief exposures to low temperaturee0
- Outcome
- induction of gene expressione0
- Qualifier
- signalling pathwaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brief exposures to low temperature results in the onset of a signalling pathway that leads to the induction of gene expression”
t0“Arabidopsis”
Claim · model-written summary
The results implicate cytosolic calcium changes in cold signaling to LTI78 expression and suggest multiple pathways.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- LTI78e0
- Outcome
- LTI78 expressione0
- Qualifier
- changes in [Ca 2+ ] cyte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the involvement of changes in [Ca 2+ ] cyt in low‐temperature signalling leading to LTI78 expression but the presence of multiple signalling pathways is suggested”
t0“Arabidopsis”
The same questions in other papers
calcium(2+) · molecular: expression · ArabidopsisResults agree
2 papers in the same direction as this paper
- negative
- no effect
lanthanum atom · molecular: expression · ArabidopsisResults agree
2 papers in the same direction as this paper
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.