Gamma Irradiation Stimulates HDA14 Expression: Perspectives in Radiation Epigenetics for Plant Breeding

Gamma irradiation is a commonly used technique to induce genetic variations in crops for plant breeding programs, but its unpredictable nature and potential for unwanted mutations hinder its widespread application. Epigenetics, however, provides an alternative approach for developing desirable plant traits without altering the DNA sequence. In this study, we investigated the impact of ionizing radiation on the epigenome by performing a meta-analysis on the expression levels of Class II histone deacetylases (HDAs). We found that 200-Gy exposure of Arabidopsis seedlings downregulated Class II HDAs while upregulating AtHDA14 expression in mature rosette leaves, suggesting a developmental stage-specific response to radiation. The increased expression of AtHDA14 stimulated multiple biological processes and molecular functions, potentially generating transgenerational epigenetic variants associated with enhanced stress resilience and improved crop performance. This finding supports the concept of "radiation epigenetics" as a promising paradigm for plant breeding. However, further empirical testing is necessary to validate the effectiveness and safety of this approach. Harnessing the potential of ionizing radiation to modulate Class II HDA expression and modify epigenetic marks could revolutionize plant breeding practices, hence offering new avenues for developing stress-tolerant and high-yielding crop varieties.