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1

Resistance genes in wild accessions of Triticeae ? inoculation test and STS marker analyses

100%
Stepien L., Holubec V., Chelkowski J.
Journal of Applied Genetics
|
2002
|
vol. 43
|
issue 4
423-435
EN
Sequence tagged site (STS) markers have been developed recently to identify resistance genes in wheat. A number of wild relatives have been used to transfer resistance genes into wheat cultivars. Accessions of wild species of Triticeae: Aegilops longissima (4), Ae. speltoides (6), Ae. tauschii (8), Ae. umbellulata (3), Ae. ventricosa (3), Triticum spelta (2), T. timopheevi (3), T. boeoticum (4) and T. monococcum (1), 34 in total, were examined using PCR-STS markers for resistance genes against Puccinia recondita f.sp. tritici (Lr) and Erysiphe graminis (Pm). Additionally, a set of cv. Thatcher near-isogenic lines conferring resistance genes Lr 1, Lr 9, Lr 10, Lr 24, Lr 28, Lr 35 and Lr 37 were examined with the same procedure. Twenty-two accessions were tested using the inoculation test for resistance to Erysiphe graminis, Puccinia recondita, P. striiformis and P. graminis. The most resistant entries were those of Aegilops speltoides and Triticum timopheevi and among T. boeoticum accession #5353. Markers of all mentioned Lr resistance genes were identified in all corresponding cv. Thatcher near-isogenic lines (except Lr 35 gene marker). The following resistance gene markers were identified in wild Triticeae accessions: Lr 1 in two accessions of Ae. tauschii and one accession of Ae. umbellulata, Lr 9 in one accession of Ae. umbellulata, Lr 10 in one accession of T. spelta, Lr 28 in 11 accessions: Ae. speltoides (4), Ae. umbellulata (2), T. spelta (2) and T. timopheevi (3), Lr 37 in 3 accessions of Ae. ventricosa, Pm 1 in all 34 accessions, Pm 2 in 28 accessions, Pm 3 in all 4 accessions of T. boeoticum, 1 accession of T. spelta and 1 of T. timopheevi, and Pm 13 in 5 out of 6 accessions of Ae. speltoides. Reliability and usefulness of STS markers is discussed.
2

Production and morphology of the hybrids Aegilops kotschyi ? Secale cereale and Ae. biuncialis ? S. cereale

88%
Wojciechowska B., Pudelska H.
Journal of Applied Genetics
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2002
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vol. 43
|
issue 3
279-285
EN
Hybrids between Aegilops kotschyi and Ae. biuncialis with Secale cereale were synthesized. Five Ae. kotschyi and four Ae. biuncialis accessions, as well as one inbred and four self-compatible forms of Secale cereale were used for crossing. The hybrids were produced directly from cultured embryos or through embryo callus culture. Sixty hybrids, 11 involving Ae. kotschyi and 49 Ae. biuncialis, had a stable somatic chromosome number 2n = 3x = 21. The plants showed good vegetative vigour and tillering capacity. Morphologically the hybrids were intermediate between their parents and completely sterile. In vitro propagation of Ae. kotschyi and Ae. biuncialis ? S. cereale hybrids revealed that their capacity for callus production and plantlet regeneration ? varies.
3

Gene transfer from Aegilops ventricosa to Triticum aestivum

75%
Tyrka M., Stefanowska G., Brzezinski W.
Biotechnologia
|
2001
|
issue 2
57-62
EN
RAPD (Randomly Amplified Polymorphic DNA) and glutenin SDS-PAGE analyses were performed on wheat hybrid strains derived from multiple crosses of hybrids between Ae. ventricosa and T. durum with hexaploid wheat. We found Aegilops specific bands (G03580 and T02990) in two hybrid strains (VGPB and VGPAA) using RAPD method. The presence of Ae. ventricosa specific fraction of glutenin was shown in one wheat hybrid strain (VGPP).
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