Cytogenetic Studies in Avena, XIII. The relationship of synaptic factors between tetraploid and hexaploid species

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Avena barbata (2n=28, AAB'B') was crossed with a fatuoid heterozygote (2n=41, AABBCC-c) of A. sativa which is monosomic for the c-chromosome carrying both factors for the cultivated type grain character and normal synapsis, and the two types of the F1 plants, i. e. 35-chromosome plants (AABB'C) and 34-chromosome plants (AABB'C-c), were compared in their morphological characteristics and chromosome pairing. The 34-chromosome plants were shorter in plant height and showed the wild grain character, owing to the deficiency of the c-chromosome. In regard to chromosome pairing, no significant differences were found between the two types in the average number of pairs or of chiasmata per cell at metaphase I. It demonstrates that the meiotic pairing between the homologous chromosomes from the two species can take place in the absence of the synaptic factor of A. sativa, as the chromosomes are paired probably in the presence of the synaptic factor(s) of A. barbata.
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