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Dynamic expression of small RNA populations in larch (Larix leptolepis).

Abstract：

:Small RNAs (sRNAs) are emerging as essential regulators of biological processes. However, several studies have reported that gymnosperms do not express appreciable amounts of 24-nt sRNAs, and conifers in particular may have a unique sRNA-silencing signature. Here, we compared the sRNA transcriptomes of Japanese larch somatic embryos (SE) and seedlings. SE sRNAs exhibited a length bias toward 24 nt, while seedlings showed a bias toward a 21-nt length. We also confirmed that larch is capable of producing 24-nt sRNAs based on a polyacrylamide gel analysis. The sRNA expression patterns varied according to developmental stage, which might be associated with Dicer-like 3 and RNA-dependent RNA polymerase2 (RDR2) levels. Our data suggest that many MIR loci that produce canonical microRNAs (miRNAs, 20-22 nt) and long sRNAs (23-26 nt) have dual functions; the latter were preferentially produced in SE compared to seedlings. However, the ratio of miRNAs to total sRNAs in seedlings was higher than in SE, and most miRNAs were upregulated in seedlings. Trans-acting small interfering RNAs (ta-siRNAs) generated from TAS3 triggered by miR390 were identified, and levels of the three detected ta-siRNAs peaked in mature embryos, which was not consistent with the lowest RDR6 level. These findings indicate that larch, and possibly other gymnosperms, shares a common sRNA pathway with other land plants, and that the sRNA distribution pattern varies according to developmental stage, which may be attributable to the expression of sRNA pathway genes.

journal_name

Planta

journal_title

Planta

authors

Zhang J,Wu T,Li L,Han S,Li X,Zhang S,Qi L

doi

10.1007/s00425-012-1753-4

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

89-101

issue

1

eissn

0032-0935

issn

1432-2048

journal_volume

237

pub_type

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