Summary of 454 data generated for cork oak root transcriptome and quality filtering.

Total number of base pairs sequenced for each tissue sample. ^bTotal number of reads for each tissue sample. ^cNumber of low-quality reads removed. ^dNumber of trimmed reads containing primer/adaptor sequence. ^eNumber of short reads (less than 100 bp) removed. ^fNumber of reads identified as chloroplast reads. ^gNumber of reads identified as mitochondrial reads. ^hNumber of reads identified as P. tinctorius reads. ⁱNumber of reads identified as fungi, bacteria and virus reads. ^jNumber of high-quality reads used for further analysis. ^kAverage length of high quality reads in bp.