Abstract
Epigenetics has evolved rapidly over the last two decades as a contemporary field of biology. In present day, it represents the heritable mitotic or even meiotic genetic change which does not alter the DNA sequence. Plants are considered as the masters of epigenetic regulation since they have the capability of rapid and reversible alteration of their epigenetic state and also maintaining a stable “memory” of it. Plants being sessile in nature are exposed to adverse environmental conditions which hampers their growth, development, productivity, and survival. They have developed intricate mechanisms at molecular level to withstand such stressful situations. Recent studies have documented the epigenetic control on stress-responsive mechanisms in response to various abiotic stresses. Several epigenetic mechanisms identified so far involve DNA methylation, histone modifications (acetylation, methylation, phosphorylation, ubiquitination, biotinylation, and sumoylation), chromatin remodeling, and small RNA (miRNA and siRNA) directed DNA methylation. Plants make wide use of DNA methylation as an epigenetic mark and undergo histone modifications to carry out transcriptional as well as posttranscriptional gene silencing programs. In this chapter, we have recapitulated the historical overview of the field of epigenetics followed by the various epigenetic mechanisms and lastly reviewed the studies related to various abiotic stress responses to understand the role of different epigenetic mechanisms in different plant species.
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Abbreviations
- ADA2:
-
Alternation/deficiency in activation 2
- AGO:
-
ARGONAUTE
- CAM:
-
Crassulacean acid metabolism
- CBF1:
-
C-repeat/DRE binding factor1
- CBP:
-
CREB-binding protein
- CLF:
-
CURLY LEAF
- CMT3:
-
CHROMOMETHYLASE3
- DCLs:
-
Dicer-Like
- DME:
-
Demeter
- DML:
-
Demeter-Like
- DRM:
-
DOMAINS REARRANGED METHYLASE
- dsRNAs:
-
double-stranded RNAs
- OsFIE1:
-
Orzya sativa Fertilization-Independent Endosperm1
- GCN5:
-
General Control Non-derepressible5
- GNAT:
-
GCN5-related N-terminal acetyltransferase
- HATs:
-
histone acetyltransferases
- HDACs:
-
histone deacetylases
- HDMs:
-
histone demethylases
- HKMTs:
-
histone lysine methyltransferase
- HOS15:
-
High expression of osmotically responsive gene 15
- HST1:
-
HASTY
- JmjC:
-
Jumonji C
- LSD1:
-
Lysine-Specific Demethylase1
- m5C:
-
5-methylcytosine
- MEA:
-
MEDEA
- MET1:
-
DNA METHYLTRANSFERASE1
- miRNAs:
-
microRNAs
- MSAP:
-
Methylation sensitive amplification polymorphism
- ncRNAs:
-
non-coding RNAs
- NRPD1:
-
NUCLEAR RNA POLYMERASE D1
- NRPE1:
-
Nuclear RNA Polymerase E1
- pri-miRNAs:
-
primary miRNAs
- RdDM:
-
RNA-directed DNA methylation
- RDR:
-
RNA-dependent RNA polymerases
- RISC:
-
RNA-induced silencing complex
- ROS1:
-
Repressor of Silencing1
- SAHH1:
-
S-ADENOSYL-L-HOMOCYSTEINE HYDROLASE1
- SAM:
-
S-adenosyl L-methionine
- SDN:
-
Small RNA Degrading Nuclease
- siRNAs:
-
small interfering RNAs
- sRNAs:
-
Small RNAs
- ssRNAs:
-
single stranded RNAs
- SWN:
-
SWINGER
- TAFII250:
-
TATA binding protein-associated factors
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Authors are thankful to the University Grants Commission and Visva-Bharati for providing all the facilities.
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Bej, S., Basak, J. (2017). Abiotic Stress Induced Epigenetic Modifications in Plants: How Much Do We Know?. In: Rajewsky, N., Jurga, S., Barciszewski, J. (eds) Plant Epigenetics. RNA Technologies. Springer, Cham. https://doi.org/10.1007/978-3-319-55520-1_24
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