http://www.cnr.it/ontology/cnr/individuo/prodotto/ID283760
Molecular mapping of segregation distortion loci in Aegilops tauschii (Articolo in rivista)
- Type
- Label
- Molecular mapping of segregation distortion loci in Aegilops tauschii (Articolo in rivista) (literal)
- Anno
- 1998-01-01T00:00:00+01:00 (literal)
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- Faris J.D.; Laddomada B.; Gill B.S. (literal)
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- Wheat Genetics Resource Center, Department of Plant Pathology, Kansas State University, Manhattan, KS 66506, United States; Institute of Plant Breeding, University of Bari, 70126, Bari, Italy; Department of Biology, University of Basilicata-Potenza, via N. Sauro 85, 85100 Potenza, Italy (literal)
- Titolo
- Molecular mapping of segregation distortion loci in Aegilops tauschii (literal)
- Abstract
- Distorted segregation ratios of genetic markers are often observed in progeny of inter- and intraspecific
hybrids and may result from competition among gametes or from abortion of the gamete or zygote. In
this study, 194 markers mapped in an Aegilops tauschii F2 population were surveyed for distorted segregation
ratios. Region(s) with skewed segregation ratios were detected on chromosomes 1D, 3D, 4D, and 7D. These
distorter loci are designated as QSd.ksu-1D, QSd.ksu-3D, QSd.ksu-4D, and QSd.ksu-7D. Three regions of
segregation distortion identified on chromosome 5D were analyzed in two sets of reciprocal backcross
populations to analyze the effect of sex and cytoplasm on segregation distortion. Extreme distortion of
marker segregation ratios was observed in populations in which the F1 was used as the male parent, and
ratios were skewed in favor of TA1691 alleles. There was some evidence of differential transmission
caused by nucleo-cytoplasmic interactions. Our results agree with other studies stating that loci affecting
gametophyte competition in male gametes are located on 5DL. The distorter loci on 5DL are designated
as QSd.ksu-5D.1, QSd.ksu-5D.2, and QSd.ksu-5D.3. (literal)
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