Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 12/1/1996
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Chromosomal rearrangement is an important mechanism of genomic differentiation in oat (genus Avena), as evidenced by molecular and classical cytogenetic studies. The objective of the present study was to investigate using C-banding the genotypic and geographic distributions of major intergenomic translocation segments in the cultivated hexaploid oat taxa A. byzantina and A. sativa. These translocation segments were initially identified via analyses of molecular genetic and cytogenetic data. Forty-two cultivars and landraces representing both taxa and of diverse geographic and ancestral origins were examined. Translocation segments on chromosomes 1C, 7C, 10, 12, and 21 were found in all accessions, indicating that these translocations likely predated the domestication of cultivated oat. However, a putative reciprocal translocation involving chromosomes 7C and 17 in most A. sativa cultivars and old introductions was absent in the majority of A. byzantina landraces Two translocations found among 'Kanota' and 'Sun II' monosomic lines were not observed in any other oat cultivars. Implications of these findings will be discussed.