期刊
SCIENCE
卷 328, 期 5980, 页码 872-875出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1187959
关键词
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资金
- Commonwealth scholarship [CACR 2006-115]
- Natural Sciences and Engineering Research Council of Canada [PGS D2 358506-2008]
- Royal Society
- Gatsby Charitable Foundation
- European Union [LSHG-CT-2006-037900]
- European Research Council [233325 REVOLUTION]
A silencing signal in plants with an RNA specificity determinant moves through plasmodesmata and the phloem. To identify the mobile RNA, we grafted Arabidopsis thaliana shoots to roots that would be a recipient for the silencing signal. Using mutants that block small RNA (sRNA) biogenesis in either source or recipient tissue, we found that transgene-derived sRNA as well as a substantial proportion of the endogenous sRNA had moved across the graft union, and we provide evidence that 24-nucleotide mobile sRNAs direct epigenetic modifications in the genome of the recipient cells. Mobile sRNA thus represents a mechanism for transmitting the specification of epigenetic modification and could affect genome defense and responses to external stimuli that have persistent effects in plants.
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