Genomic Affinity Relationships in the Genus <i>Avena</i>

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<jats:title>Abstract</jats:title><jats:p>Many interspecific hybrids between diploid, tetraploid and hexaploid <jats:italic>Avena</jats:italic> species were obtained without artificial embryo cultures. Most of the hybrids showed variable chromosome pairing with univalents, bivalents and multiple associations, even in PMC in the same hybrid, at first metaphase; making ii very difficult to understand the degree of genome affinity between parent species, and especially between different species. The basic or theoretical chromosome pairing consisting of bivalents and univalents is presented, in which the chromosome ratios (%) statistically agree with observations. In addition, the per cent frequency of chromosomes forming multivalents is calculated. On the bases of these numerical data, the genomic affinity relationships are discussed for present and previously reported interspecific hybrids or <jats:italic>Avena.</jats:italic></jats:p>

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