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Histone acetylation is involved in GA-mediated 45S rDNA decondensation in maize aleurone layers.
Plant Cell Reports 2018 January
KEY MESSAGE: The aleurone layer is crucial to seed germination. Using dissected aleurone layers, we found that GA increased histone acetylation accompanied by rDNA decondensation in aleurone layers during maize seed germination. Aleurone layers play an important role in cereal seed germination. In this study, we reported that rDNA chromatin was decondensed, accompanied with increased rDNA expression and genomic global hyperacetylation in gibberellin (GA)-treated maize-dissected aleurone layers. The activity analysis of histone acetyltransferase (HAT) and deacetylase (HDAC) showed that GA increased the level of histone acetylation by promoting the ratio of HAT/HDAC activity in aleurone layers. HDAC inhibitors TSA and CUDC-101 elevated the histone acetylation in aleurone layers accompanied by 45S rDNA decondensation. The further chromatin immunoprecipitation experiments showed that GA treatment promoted the level of histone acetylation in the promoter region of the rRNA and HAT/HDAC genes in aleurone layers. Taken together, these data indicated that histone acetylation mediates GA-regulated 45S rDNA chromatin decondensation in aleurone layers during maize seed germination.
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