Small RNAs in pollen

In plants, each pollen mother cell undergoes two rounds of cell divisions to form a mature pollen grain, which contains a vegetative cell（VC） and two sperm cells（SC）. As a companion cell, the VC carries the SCs to an ovule by germinating a pollen tube. In-depth sequencing analyses of mature pollen s...

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Bibliographic Details
Published in:Science China. Life sciences 2015-03, Vol.58 (3), p.246-252
Main Authors: He, Hui, Yang, TianYu, Wu, WenYe, Zheng, BingLian
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Epigenesis, Genetic
Life Sciences
MicroRNAs - genetics
Pollen - genetics
Review
RNA, Plant - genetics
RNA, Small Interfering - genetics
TES
小RNA
小分子RNA
成熟花粉
细胞分裂
花粉母细胞
营养细胞
表观遗传学
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Summary:In plants, each pollen mother cell undergoes two rounds of cell divisions to form a mature pollen grain, which contains a vegetative cell（VC） and two sperm cells（SC）. As a companion cell, the VC carries the SCs to an ovule by germinating a pollen tube. In-depth sequencing analyses of mature pollen showed that micro RNAs（mi RNAs） and short interfering RNAs（si RNAs） are present in both the VC and SCs. Additionally, epigenetically-regulated transposable elements（TEs） are reactivated in the VC and these TE m RNAs are further processed into 21-nt epigenetically reactivated si RNA（easiR NA） in SCs, which prevent 24-nt si RNA accumulation and sequester mi RNA loading. Small RNAs are thought to move from the VC to SCs, where they regulate gene expression and reinforce TE silencing. Here, we summarize current knowledge of the biogenesis and function of mi RNAs, si RNAs, and easi RNAs in pollen, emphasizing how these different small RNAs coordinately contribute to sperm cell formation and TE silencing.
ISSN:1674-7305
1869-1889
DOI:10.1007/s11427-015-4800-0