期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-25128-y
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资金
- NSF IOS award [1754097]
- NIH-NIGMS [P20 GM103446]
- NSF [IIA-1301765]
- State of Delaware
- [S10 OD016361]
Plant small RNAs play an important role in regulating gene expression and maintaining genome integrity. Reproductive phasiRNAs are key elements in plant development, present in various plant species and playing a crucial role in the development of floral reproductive organs.
Plant small RNAs are important regulatory elements that fine-tune gene expression and maintain genome integrity by silencing transposons. Reproductive organs of monocots produce abundant phased, small interfering RNAs (phasiRNAs). The 21-nt reproductive phasiRNAs triggered by miR2118 are highly enriched in pre-meiotic anthers, and have been found in multiple eudicot species, in contrast with prior reports of monocot specificity. The 24-nt reproductive phasiRNAs are triggered by miR2275, and are highly enriched during meiosis in many angiosperms. Here, we report the widespread presence of the 21-nt reproductive phasiRNA pathway in eudicots including canonical and non-canonical microRNA (miRNA) triggers of this pathway. In eudicots, these 21-nt phasiRNAs are enriched in pre-meiotic stages, a spatiotemporal distribution consistent with that of monocots and suggesting a role in anther development. Although this pathway is apparently absent in well-studied eudicot families including the Brassicaceae, Solanaceae and Fabaceae, our work in eudicots supports an earlier singular finding in spruce, a gymnosperm, indicating that the pathway of 21-nt reproductive phasiRNAs emerged in seed plants and was lost in some lineages. Pre-meiotic anthers of monocots accumulate phased, small interfering RNAs (phasiRNAs) that are absent in many well-studied model eudicots. Here, the authors show that such 21-nt phasiRNAs are in fact present in diverse eudicot species including strawberry, in which production is triggered by miR11308.
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