Genome organization of the Pi2/9 locus in 14 rice lines with entire Pi2/9 locus. The Pi2/9 gene family members were indicated by colored arrows showing the transcriptional direction. Pi2/9 homologs within the same subfamily were indicated with the same color. Pi2/9-GLA-6, not included in any clade (due to a partial sequence), was shown with an open arrow. The non-Pi2/9 homologs, NIP (nitrate-induced protein gene) and PK (protein kinase gene) were indicated with rectangles. The gaps of undetermined length and very long distances between members were indicated by a double slash and dashed lines (not in scale), respectively. Pi2/9 locus in (A) Nippobare, (B) 93–11, (C) NK58, (D) GLA4, (E) IR24, (F) SH527, (G) MH63, (H) 75-1-127 containing the Pi9 gene, (I) C101A51 containing the Pi2 gene, (J) PA64, (K) O. punctata with the BB genome constitution, (L) BB sub genome of O. minuta, (M) CC sub genome of O. minuta, (N) O. officinalis with the CC genome constitution,(O) O. nivara with the AA genome constitution.
Wu et al. BMC Genetics 2012 13:73 doi:10.1186/1471-2156-13-73