Determination of chromosome numbers of wild Oryza species conserved in the International Rice Gene bank at IRRI.

To date, more than 3,000 wild rice accessions, representing 21 species of Oryza and 11 related genera, are being conserved in the International Rice Genebank (IRG) at IRRI. The chromosome number of each conserved accession of different Oryza species, which should be part of the passport data, is essential to facilitate characterization and species identification.