Journal
NEW PHYTOLOGIST
Volume 236, Issue 4, Pages 1529-1544Publisher
WILEY
DOI: 10.1111/nph.18446
Keywords
anther; Argonaute; microRNA; phasiRNA; rice
Categories
Funding
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110868]
- National Natural Science Foundation of China [32100289, U19A2031]
- special funds for science technology innovation and industrial development of Shenzhen Dapeng New District [KJYF202001-01]
- US National Science Foundation [1754097]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1754097] Funding Source: National Science Foundation
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In this study, the researchers investigated the role of the rice AGO1d protein in phasiRNA biogenesis and function. They found that AGO1d is specifically expressed in anther wall cells and associates with miR2118 and miR2275 to mediate phasiRNA production. Depletion of AGO1d resulted in a reduction of phasiRNAs and temperature-sensitive male sterility in rice. These findings highlight the essential role of AGO1d in anther development and demonstrate the coordination of AGO proteins in reproductive phasiRNA processes.
Phased secondary siRNAs (phasiRNAs) are broadly present in the reproductive tissues of flowering plants, with spatial-temporal specificity. However, the ARGONAUTE (AGO) proteins associated with phasiRNAs and their miRNA triggers remain elusive. Here, through histological and high-throughput sequencing analyses, we show that rice AGO1d, which is specifically expressed in anther wall cells before and during meiosis, associates with both miR2118 and miR2275 to mediate phasiRNA biogenesis. AGO1d preferentially binds to miR2118-triggered 21-nucleotide (nt) phasiRNAs with a 5 '-terminal uridine, suggesting a dual role in phasiRNA biogenesis and function. Depletion of AGO1d causes a reduction of 21- and 24-nt phasiRNAs and temperature-sensitive male sterility. At lower temperatures, anthers of the ago1d mutant predominantly show excessive tapetal cells with little starch accumulation during pollen formation, possibly caused by the dysregulation of cell metabolism. These results uncover an essential role of AGO1d in rice anther development at lower temperatures and demonstrate coordinative roles of AGO proteins during reproductive phasiRNA biogenesis and function.
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