Abstract
The newly discovered tetraploid oat Avena insularis was crossed with the diploid A. strigosa and the tetraploid A. murphyi. Considerably reduced chromosome association at meiosis and a low average number of chiasmata per cell of the A. strigosa × A. insularis hybrids indicated that the diploid A. strigosa did not participate in the creation of A. insularis. From A. murphyi, A. insularis differed by four chromosomal rearrangements and the hybrids between them were sterile. The tetraploids A. magna, A. murphyi and A. insularis share the two to four floret large diaspore, which is adapted to heavy alluvial soil. They all, however, diverge from one another by four chromosomal rearrangements. At this point it is not possible to determine whether they have diverged from a single tetraploid progenitor, or developed from different diploid species.
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References
Chen, Q. & K. Armstrong, 1994. Genomic in situ hybridization in Avena sativa. Genome 37: 607–612.
Ladizinsky, G., 1971. Chromosome relationships between tetraploid (2n = 28) Avena murphyi and some diploid, tetraploid and hexaploid species of oats. Can. J. Genet. Cytol. 13: 203–209.
Ladizinsky, G., 1995. Characterization of the missing diploid progenitors of common oat. Genet. Resour. Crop Evol. 42: 49–55.
Ladizinsky, G., 1998. A new species of Avena from Sicily, possibly the tetraploid progenitor of hexaploid oats. Genet. Resour. Crop Evol. 45: 263–269.
Leggett, J.M. & G.S. Markhand, 1995. The genomic structure of Avena revealed by GISH. In: P.E. Brandham & M.D. Bennett (Eds), Kew Chromosome Conference IV, pp. 133–139. Royal Botanic Gardens, Kew, Surrey, U.K.
Linares, C., J. Gonzales, E. Ferrer & A. Fominaya, 1996. The use of double inflourescence in situ hybridization to physically map the position of 5S rDNA genes in relation to chromosomal location of 18S-5.8S-26S rDNA and a C genome specific DNA sequence in the genus Avena. Genome 39: 535–542.
Linares, C., E. Ferrer & A. Fominaya, 1998. Discrimination of the closely related A and D genomes of the hexaploid Avena sativa L. Proc. Natl. Acad. Sci. USA 95: 12450–12455.
Rajhathy, T. & R.S. Sadasivaiah, 1968. The chromosomes of Avena magna. Can. J. Genet. Cytol. 10: 385–389.
Thomas, H., 1992. Cytogenetics of Avena. In: H.G. Marshall & M.E. Sorrells (Eds), Oat Science and Technology, pp 473–507. Soc. Agron., Madison, WI, USA.
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Ladizinsky, G. Cytogenetic relationships between Avena insularis (2n=28) and both A. strigosa (2n=14) and A. murphyi (2n=28). Genetic Resources and Crop Evolution 46, 501–504 (1999). https://doi.org/10.1023/A:1008728316354
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DOI: https://doi.org/10.1023/A:1008728316354