期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-08543-0
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资金
- National Key Research and Developmental Program of China [2018YFD1000104]
- National Natural Science Foundation of China [31872063, 31471859]
- Outstanding Talent Program of the Ministry of Agriculture, the Guangzhou Science and Technology Key Project [201804020063]
- Innovation Team Project of the Department of Education of Guangdong Province [2016KCXTD011]
- US National Science Foundation Plant Genome Research Program [1339229]
- Microscopy equipment was acquired with a shared instrumentation grant [S10 OD016361]
- NIH-NIGMS [P20 GM103446]
- NSF [IIA-1301765]
- State of Delaware, USA
Small RNAs are key regulators in plant growth and development. One subclass, phased siRNAs (phasiRNAs) require a trigger microRNA for their biogenesis. In grasses, two pathways yield abundant phasiRNAs during anther development; miR2275 triggers one class, 24-nt phasiRNAs, coincident with meiosis, while a second class of 21-nt phasiRNAs are present in premeiotic anthers. Here we report that the 24-nt phasiRNA pathway is widely present in flowering plants, indicating that 24-nt reproductive phasiRNAs likely originated with the evolutionary emergence of anthers. Deep comparative genomic analyses demonstrated that this miR2275/24-nt phasiRNA pathway is widely present in eudicots plants, however, it is absent in legumes and in the model plant Arabidopsis, demonstrating a dynamic evolutionary history of this pathway. In Solanaceae species, 24-nt phasiRNAs were observed, but the miR2275 trigger is missing and some loci displaying 12-nt phasing. Both the miR2275-triggered and Solanaceae 24-nt phasiRNAs are enriched in meiotic stages, implicating these phasiRNAs in anther and/or pollen development, a spatiotemporal pattern consistent in all angiosperm lineages that deploy them.
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