2019
DOI: 10.1111/nph.15854
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Intercellular delivery of small RNAs in plant gametes

Abstract: Summary Small RNAs are 20–24 nucleotides in length. In plants, small RNAs are classified into microRNAs (miRNAs) and small interfering RNAs (siRNAs), based on their biogenesis and molecular features. In contrast to the extensive knowledge of the roles of small RNAs in sporophytic tissues, the distribution and function of small RNAs in gametophytic cells have been less well studied. However, with the improvement of single‐cell sorting and RNA sequencing technologies, the distribution of small RNAs, especially s… Show more

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Cited by 18 publications
(9 citation statements)
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“…Similarly, miR165/166 precursors were transcribed mainly in the endodermis of Arabidopsis root, but mature miR166 were observed in adjacent cell layers (Carlsbecker et al , ). These and other examples are consistent with the cell‐to‐cell movement of miRNA (Chitwood et al, 2009; Martínez et al, ; Wu and Zheng, ) (see Figure a).…”
Section: Short‐ and Long‐distance Movement Of Small Rnas In Plants Ansupporting
confidence: 85%
“…Similarly, miR165/166 precursors were transcribed mainly in the endodermis of Arabidopsis root, but mature miR166 were observed in adjacent cell layers (Carlsbecker et al , ). These and other examples are consistent with the cell‐to‐cell movement of miRNA (Chitwood et al, 2009; Martínez et al, ; Wu and Zheng, ) (see Figure a).…”
Section: Short‐ and Long‐distance Movement Of Small Rnas In Plants Ansupporting
confidence: 85%
“…After the second pollen mitosis, ARID1 is absent in sperm cells due to the repression of MET1 (Li et al, 2017), and the siRNA/AGO9 cargo recruits the heterochromatic machinery to maintain heterochromatic silencing. The finding that DDM1 and MET1, two essential factors responsible for TE silencing, exhibit sperm-specific accumulation in pollen (Borges et al, 2008;Slotkin et al, 2009;Li et al, 2017) indicates that the differential regulation of chromatin between the companion cell and the germline could be the consequence of specific spatiotemporal expression patterns of these key epigenetic regulators during plant gametogenesis (Wu & Zheng, 2019). Together with our previous findings that ARID1 functionally associates with histone deacetylases (HDACs; Zheng et al, 2014) and MET1 (Li et al, 2017), we hypothesize that the function of ARID1 might be related to epigenetic regulation during plant reproductive development.…”
Section: Discussionmentioning
confidence: 99%
“…Finally, epigenetic mechanisms involving small RNAs, in particular siRNAs, are relevant during plant reproduction, for example during a phase of global reactivation of TEs in gametes. During this stage an intercellular movement of siRNAs between companion cells and male gametic cells has been observed, and recent studies have elucidated the function of sperm‐delivered siRNAs during early seed development (reviewed by Wu & Zheng, 2019).
‘Our understanding of the control and function of structural modifications to DNA has, in recent years, been complemented by developmental and ecological perspectives of epigenetics.’
…”
Section: Epigenetics and Plant Developmentmentioning
confidence: 99%