The role of epigenetics in the maintenance of plant genome stability.

摘要

Significant alterations in the environmental conditions can have pronounced effects on plant genome stability. Recent evidence argues for a global involvement of the components of epigenetic modules in the regulation of genome homeostasis both immediately after stress exposure and long after environmental cues were acquired. The last observation is of particular interest as the memory of imposing stress can be maintained at the molecular level throughout plant ontogenesis and may be faithfully propagated into the following generation. Our study provides evidence that epigenetic repercussions exerted by stress exposure of parental plants manifest themselves in untreated progeny at all three levels of the epigenetic module: DNA methylation, histone posttranslational modifications and small RNA metabolism. Additionally, the results of our study shed new light on the engagement of the epigenetic machinery in the maintenance of plant genome integrity by counteracting the activity of invading nucleic acids.