ABA signaling is necessary but not sufficient for RD 29 B transcriptional memory during successive dehydration stresses in A rabidopsis thaliana
Summary Plants subjected to a prior dehydration stress were seen to have altered transcriptional responses during a subsequent dehydration stress for up to 5 days after the initial stress. The abscisic acid ( ABA ) inducible RD 29B gene of A rabidopsis thaliana was strongly induced after the first s...
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Published in | The Plant journal : for cell and molecular biology Vol. 79; no. 1; pp. 150 - 161 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.07.2014
|
Online Access | Get full text |
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Summary: | Summary
Plants subjected to
a prior
dehydration stress were seen to have altered transcriptional responses during a subsequent dehydration stress for up to 5 days after the initial stress. The abscisic acid (
ABA
) inducible
RD
29B
gene of
A
rabidopsis thaliana
was strongly induced after the first stress and displayed transcriptional memory with transcript levels nine‐fold higher during the second dehydration stress. These increased transcript levels were due to an increased rate of transcription and are associated with an altered chromatin template during the recovery interval between the dehydration stresses. Here we use a combination of promoter deletion/substitutions, mutants in the
trans
‐acting transcription factors and their upstream protein kinases, and treatments with exogenous
ABA
or dehydration stress to advance our understanding of the features required for transcriptional memory of
RD
29B
.
ABA
Response Elements (
ABRE
s) are sufficient to confer transcriptional memory on a minimal promoter, although there is a context effect from flanking sequences. Different mutations in
Snf1 Related Protein Kinase 2
(
Sn
RK
2
) genes positively and negatively affected the response, suggesting that this effect is important for transcriptional memory. Although exogenous
ABA
treatments could prime transcriptional memory, a second
ABA
treatment was not sufficient to activate transcriptional memory. Therefore, we concluded that transcriptional memory requires
ABA
and an
ABA
‐independent factor that is induced or activated by a subsequent dehydration stress and directly or indirectly results in a more active
RD
29B
chromatin template. These results advance our knowledge of the
cis
‐ and
trans
‐acting factors that are required for transcriptional memory of
RD
29B
. |
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ISSN: | 0960-7412 1365-313X |
DOI: | 10.1111/tpj.12548 |