AI Article Synopsis
- Intraspecific hybrids of Arabidopsis thaliana (C24 and Landsberg erecta) exhibit significant heterosis, characterized by enhanced traits compared to their parent strains.
- Findings indicate that these hybrids display reduced levels of 24-nt small RNA (sRNA), particularly in loci where parental sRNA levels differ substantially, potentially impacting gene expression.
- Several genes with changed 24-nt sRNA levels were linked to alterations in DNA methylation and expression, suggesting that epigenetic diversity among ecotypes may enhance allelic variability and contribute to hybrid vigor.
Article Abstract
Intraspecific hybrids between the Arabidopsis thaliana accessions C24 and Landsberg erecta have strong heterosis. The reciprocal hybrids show a decreased level of 24-nt small RNA (sRNA) relative to the parents with the decrease greatest for those loci where the parents had markedly different 24-nt sRNA levels. The genomic regions with reduced 24-nt sRNA levels were largely associated with genes and their flanking regions indicating a potential effect on gene expression. We identified several examples of genes with altered 24-nt sRNA levels that showed correlated changes in DNA methylation and expression levels. We suggest that such epigenetically generated differences in gene activity may contribute to hybrid vigor and that the epigenetic diversity between ecotypes provides increased allelic (epi-allelic) variability that could contribute to heterosis.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3038704 | PMC |
| http://dx.doi.org/10.1073/pnas.1019217108 | DOI Listing |
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