CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Genome Relationship Between Diploid and Tetraploid Avena
K. C. DalalK. Sadanaga
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1971 年 36 巻 1 号 p. 126-132

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Chromosome pairing in the A0 generation of the amphiploids of Avena abyssinica (C.I. 2108)×A. strigosa (C.I. 7010) and in the A3 generation of the amphiploid of A. abyssinica (C.I. 7233)×A. strigosa (C.I. 2630) was analyzed. The average number of bivalents per pollen mother cell was higher in the A0 generation than in the A3 generation. Conversely, the average number of multivalents and univalents per cell was lower in the A0 than in the A3 generation.
The difference in frequencies of kinds of pairing associations between A0 and A3 generations suggest that the A genomes of A. abyssinica and A. strigosa have differentiated. This differentiation, however, does not prevent the occasional pairing between A genome chromosomes of the diploid and tetraploid species. Such pairing and crossing over will eventually lead to formation of four completely homologous chromosomes in amphiploids of later generations. If we designate the A genome constitution of an autotetraploid as ADADADAD and a natural tetraploid as ATAT, then the genome constitution of the four homologous chromosomes in advanced generation amphiploids can be designated as AD-TAD-TAD-TAD-T
A few multivalents and univalents were observed in PMCs of two derived tetraploid lines, 57-127 and 57-133, from synthetic 6X amphiploids. However, the most common association was 14 bivalents expected in a stable tetraploid line.

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