Hybridization of AA genome rice species from Asia and Australia. II. Meiotic analysis of Oryza meridionalis and its hybrids

• Published in: Genetic resources and crop evolution Vol. 44; no. 1; pp. 25 - 31
• Main Authors: Lu, B.R, Naredo, M.E.B, Juliano, A.B, Jackson, M.T
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 1997
• Subjects: Affinity; cell biology; Chiasma frequency; chromosome pairing; Chromosome translocations; Chromosomes; Constitution; crossing over; cytogenetics; genome; Genomes; genomics; Hybridization; Hybrids; interspecific hybridization; Inversions; Meiosis; Metaphase; Oryza; Oryza meridionalis; Oryza nivara; Oryza rufipogon; Oryza sativa; Species; taxonomy; wild relatives; Western Australia; Vietnam; Thailand; Queensland; India; Indonesia; Australia; Asia
• ISSN: 0925-9864; 1573-5109
• DOI: 10.1023/a:1008699705881

To determine the genomic constitution of Oryza meridionalis Ng (2n=2x=24) and to estimate genomic affinity between Asian and Australian wild species of rice containing the AA genomes, chromosome pairing was analyzed at metaphase I in O. meridionalis, O. rufipogon Griff. (2n=2x=24), O. nivara Sharma et Shastry (2n=2x=24), O. sativa f. spontanea Rosch, and their artifical hybrids. The Oryza parental species and their F1 hybrids showed normal meiosis, but slightly reduced chiasma frequency was observed in the hybrids. It is concluded from the cytological analysis that (i) the Australian O. meridionalis contains the AA genome which has very high affinity to that in the Asian AA genome wild species of rice; (ii) chromosome structual changes, such as inversions and reciprocal translocations, have occurred in the genomes of the different species studied.