Information content of the genome (DNA sequence) and
its expression in response to stress are crucial for the
adaptability of a genotype. Expression of the genome is
influenced by chromatin structure, which is governed by
processes often associated with epigenetic regulation,
namely histone variants, histone post-translational modi-
fications, and DNA methylation. Developmental and
environmental signals can induce epigenetic modifi-
cations in the genome, and thus, the single genome in
a plant cell gives rise to multiple epigenomes in response
to developmental and environmental cues [1]. Understanding
stress-induced epigenetic processes in stress
tolerance of plants requires answers to the following
questions: How much of the stress-induced gene expression
changes are associated with alterations in DNA
methylation and histone modification marks?