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Table 1 Summary of clustered miRNAs in Arabidopsis thaliana , rice ( Oryza sativa ) and poplar ( Populus trichocarpa ) genomes2

From: Plant polycistronic precursors containing non-homologous microRNAs target transcripts encoding functionally related proteins

  Populus trichocarpa Oryza sativa Arabidopsis thaliana
Number of clusters with consecutive miRNAs at a distant of (same strand miRNAs):    
   <1 kb 9 (9) 16 (14) 10 (8)
   <3 kb 14 (14) 16 (14) 13 (11)
   <10 kb 20 (20) 24 (22) 18 (16)
% of clustered miRNAs (number of clustered miRNAs/total miRNAs) 20% (47/234) 19% (68/353) 22% (42/187)
Maximal number of miRNAs encoded in a cluster (cluster size) 4 (4,593 bp) 8 (497 bp) 6 (5,522 bp)
% of clusters with (number/total of <10 kb miRNA clusters):    
   A single miRNA family 90% (18/20) 75% (18/24) 61% (11/18)
   Conserved miRNAs 90% (18/20) 54% (13/24) 44% (8/18)
  1. Analyses were based on miRNA described in miRBase version 13.0 (March 2009).