HomeInternational Rice Research Notesvol. 25 no. 2 (2000)

Identification of genomic constitution of three tetraploid Oryza species through two-probe genomic in situ hybridization

C. B. Li | D. M. Zhang | S. Ge | De-yuan Hong | Bao-rong Lu

Discipline: Agriculture



Two tetraploid Oryza species, O. minuta and O. punctata (with diploid and tetraploid types), are reported to contain the BBCC genomes based on the analysis of meiotic chromosome pairing at metaphase I of interspecific F1 hybrids. O. officinalis and O. eichingeri have diploid and tetraploid forms. The genomic constitution of tetraploid forms is still unclear. The genomic constitution of O. malampuzhaensis (treated as a synonym of O. officinalis by Vaughan 1989) was tentatively designated as BBCC, but no sound cytological data have been provided to support this designation.