Review Article

The Transcriptomics of Secondary Growth and Wood Formation in Conifers

Table 2

Specific and conserved miRNA sequences identified in angiosperms and/or conifers and respective predicted functions or targets. Some of the targets correspond to hormones and transcription factors involved in the secondary growth and wood formation.

miRNAPredicted functions or targets

Conserved miRNAs between poplar and Arabidopsis [25, 66]ptr-miR156 (i) SPB-like
(ii) Nitrate transporter
ptr-miR159 (i) MYB
(ii) Asparagine synthase
(iii) (1-4)-b-mannan endohydrolase
ptr-miR160 Auxin-responsive factor
ptr-miR162 DCL1
ptr-miR164 (i) NAC-domain protein
(ii) Protein kinase
ptr-miR168 (i) Vesicle coat protein complex COPI
(ii) AGO1
ptr-miR171 Scarecrow-like transcription factor
ptr-miR172 Homeotic protein APETALA2
ptr-miR319 MYB
ptr-miR408 (i) Plastocyanin-like
(ii) Early-responsive to dehydration-related protein
ptr-miR472 Putative disease resistance protein

Poplar miRNAs [66] ptr-miR473 (i) UV-B-resistant protein (UVR8)
(ii) GRAS domain-containing protein
ptr-miR474 (i) PPR
(ii) Protein kinase
(iii) Kinesin
(iv) Leucine-rich repeat
ptr-miR475 PPR
ptr-miR476 PPR
ptr-miR477 (i) GRAS domain-containing protein
(ii) NAC-domain protein
(iii) Zinc finger protein
ptr-miR478 Organic anion transporter
ptr-miR480 Proton-dependent oligopeptide transport family protein
ptr-miR482 Putative disease resistance protein

P. taeda miRNAs [67]pta-miR156 (i) Peptidyl-tRNA hydrolase-like
(ii) SPB-domain protein
pta-miR159 (i) MYB
(ii) Programmed cell death 6 protein-like
pta-miR160 (i) Auxin-responsive factor 10 (ARF10)
(ii) Aux/IAA protein
pta-miR319 Acyl-ACP thioesterase
pta-miR946 Disease resistance protein
pta-miR947 (i) Pepsin A
(ii) Microtubule-bundling polypeptide
(iii) Non-protein-coding genes
pta-miR948 (i) Serine/threonine kinase
(ii) Pepsin A
pta-miR950 (i) Non-protein-coding genes
(ii) AMP-binding protein
pta-miR951 Non-protein-coding genes
pta-miR952 (i) Multidrug resistance-associated protein
(ii) Thaumatin-like

Conserved miRNAs found in Pinus densata [70]pde-miR162 (i) DCL1 (RNA processing)
(ii) Nodal modulator 1-like (carboxypeptidase activity)
pde-miR166 Class III HD-Zip protein HDZ33 (DNA binding)
pde-miR171 (i) GRAS family transcription factor (DNA binding)
(ii) Actin binding protein (actin binding)
pde-miR482 Histone deacetylase (histone deacetylation)
pde-miR2118 CC-NBS-LRR resistance-like protein (defence response)