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  • 1
    Electronic Resource
    Electronic Resource
    Linkage relationships among stress-induced genes in wheat (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 795-801 
    Details
    ISSN: 1432-2242
    Keywords: Salt stress ; Water deficient ; Heat shock ; Mapping ; Triticeae ; RFLP ; Linkage map
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Linkage relationships among genes responding to water-deficit, salt stress, and heat shock were investigated in diploid wheat, Triticum monococcum L. The position of these gene loci relative to closely linked markers and the centromeres is reported. It is proposed to continue to use the present T. monococcum mapping population and the genetic maps based thereon as a framework for future determination of relationships among other genes related to environmental stress in the tribe Triticeae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220962
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of the Aegilops tauschii genepool and the evolution of hexaploid wheat (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 657-670 
    Details
    ISSN: 1432-2242
    Keywords: Key words Triticum aestivum ; Phylogeny ; Genetic distance ; Genome ; Introgression ; Allopolyploidy ; RFLP ; Glutenin ; rRNA ; Non-transcribed spacers ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Polymorphism in the lengths of restriction fragments at 53 single-copy loci, the rRNA locus Nor3, and the high-molecular-weight glutenin locus Glu1 was investigated in the D genome of hexaploid Triticum aestivum and that of Aegilops tauschii, the source of the T. aestivum D genome. The distribution of genetic variation in Ae. tauschii suggests gene flow between Ae. tauschii ssp. strangulata and ssp. tauschii in Iran but less in Transcaucasia. The “strangulata” genepool is wider than it appears on the basis of morphology and includes ssp. strangulata in Transcaucasia and southeastern (SE) Caspian Iran and ssp. tauschii in north-central Iran and southwestern (SW) Caspian Iran. In the latter region, Ae. tauschii morphological varieties ‘meyeri’ and ‘typica’ are equidistant to ssp. strangulata in Transcaucasia, and both belong to the “strangulata” genepool. A model of the evolution of Ae. tauschii is presented. On the geographic region basis, the D genomes of all investigated forms of T. aestivum are most closely related to the “strangulata” genepool in Transcaucasia, Armenia in particular, and SW Caspian Iran. It is suggested that the principal area of the origin of T. aestivum is Armenia, but the SW coastal area of the Caspian Sea and a corridor between the two areas may have played a role as well. Little genetic differentiation was found among the D genomes of all investigated free-threshing and hulled forms of T. aestivum, and all appear to share a single D-genome genepool, in spite of the fact that several Ae. tauschii parents were involved in the evolution of T. aestivum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050942
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  • 3
    Electronic Resource
    Electronic Resource
    Mapping of the K+/Na+ discrimination locus Kna1 in wheat (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 448-454 
    Details
    ISSN: 1432-2242
    Keywords: Key words  Wheat ; Salt tolerance ; Homoeologous recombination ; QTL ; RFLP ; Genetic marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   In saline environments, bread wheat, Triticum aestivum L. (genomes AABBDD), accumulates less Na+ and more K+ in expanding and young leaves than durum wheat, T. turgidum L. (genomes AABB). Higher K+/Na+ ratios in leaves of bread wheat correlate with its higher salt tolerance. Chromosome 4D from bread wheat was shown in previous work to play an important role in the control of this trait and was recombined with chromosome 4B in the absence of the Ph1 locus. A population of plants disomic for 4D/4B recombined chromosomes in the genetic background of T. turgidum was developed to investigate the genetic control of K+/Na+ discrimination by chromosome 4D. Evidence was obtained that the trait is controlled by a single locus, designated Kna1, in the long arm of chromosome 4D. In the present work, K+/Na+ discrimination was determined for additional families with 4D/4B chromosomes. The concentrations of Na+ and K+/Na+ ratios in the youngest leaf blades clustered in two nonoverlapping classes, and all recombinant families could be unequivocally assigned to Kna1 and kna1 classes. The Kna1 locus scored this way was mapped on a short region in the 4DL arm and was completely linked to Xwg199, Xabc305, Xbcd402, Xpsr567, and Xpsr375; it was also mapped as a quantitative trait. The results of the QTL analysis, based on the K+/Na+ ratios in the young leaves of greenhouse-grown plants and flag leaves of field-grown plants, agreed with the position of Kna1 determined as a qualitative trait. Several aspects of gene introgression by manipulation of the Ph1 locus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050148
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  • 4
    Electronic Resource
    Electronic Resource
    Engineering of interstitial foreign chromosome segments containing the K+/Na+ selectivity gene Kna1 by sequential homoeologous recombination in durum wheat (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 1180-1184 
    Details
    ISSN: 1432-2242
    Keywords: Key words Salt tolerance ; Triticum ; Gene transfer ; RFLP ; Genetic map ; Linkage ; Gene introgression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Targeted homoeologous recombination mediated by the absence of the Ph1 locus is currently the most efficient technique by which foreign genes can be introgressed into polyploid wheat species. Because intra-arm homoeologous double cross-overs are rare, introgressed foreign genes are usually on terminal foreign chromosome segments. Since the minimum length of such a segment is determined by the position of a gene in the chromosome, large chromosome segments with undesirable genetic effects are often introgressed. Introgression of foreign genes on short interstitial segments based on two cycles of homoeologous recombination is described here. The utility of the technique is demonstrated by the introgression of the Kna1 locus, which controls K+/Na+ selectivity in T. aestivum L., on short interstitial segments of chromosome 4D into chromosome 4B of Triticum turgidum L. The level of recombination in a homoeologous segment is not significantly affected by a juxtaposed proximal homologous segment in the absence of the Ph1 locus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050354
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  • 5
    Electronic Resource
    Electronic Resource
    Seed-storage-protein loci in RFLP maps of diploid, tetraploid, and hexaploid wheat (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 1169-1180 
    Details
    ISSN: 1432-2242
    Keywords: Key words Triticum ; Storage-protein loci ; Glutenin ; Gliadin ; Triticin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Linkages between high- and low-molecular-weight (Mr) glutenin, gliadin and triticin loci in diploid, tetraploid and hexaploid wheats were studied by hybridization of restriction fragments with DNA clones and by SDS-PAGE. In tetraploid and hexaploid wheat, DNA fragments hybridizing with a low-Mr glutenin clone were mapped at the XGlu-3 locus in the distal region of the maps of chromosome arms 1AS, 1BS, and 1DS. A second locus, designated XGlu-B2, was detected in the middle of the map of chromosome arm 1BS completely linked to the XGli-B3 gliadin locus. The restriction fragments mapped at this locus were shown to co-segregate with B subunits of low-Mr glutenins in SDS-PAGE in tetraploid wheat, indicating that XGlu-B2 is an active low-Mr glutenin locus. A new locus hybridizing with the low-Mr clone was mapped on the long arm of chromosome 7Am in diploid wheat. No glutenin protein was found to co-segregate with this new locus. Triticin loci were mapped on chromosome arms 1AS, 1BS, and 1DS. A failure to detect triticin proteins co-segregating with DNA fragments mapped at XTri-B1 locus suggests that this locus is not active. No evidence was found for the existence of Gli-A4, and it is concluded that this locus is probably synonymous with Gli-A3. Recombination was observed within the multigene gliadin family mapped at XGli-A11 (1.2 cM).1 Although these closely linked loci may correspond to the previously named Gli-A1 and Gli-A5 loci, they were temporarily designated XGli-A1.1 and XGli-A1.2 until orthology with Gli-A1 and Gli-A5 is established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050678
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  • 6
    Electronic Resource
    Electronic Resource
    The Q locus of Iranian and European spelt wheat (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 602-606 
    Details
    ISSN: 1432-2242
    Keywords: Key words Triticum ; Hexaploid ; Mapping ; RFLP ; RSL ; Spelt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A dominant allele at the Q locus on chromosome 5A is believed to be the principal factor responsible for free-threshing, square-head spikes with a non-fragile rachis in bread wheat, Triticum aestivum ssp. aestivum. The spelt syndrome, resulting in pyramidal spikes with a brittle rachis and hulled grain in T. aestivum, is believed to be principally caused by the q allele. Chromosome 5A of European and Iranian spelt was substituted for 5A of bread wheat and the lines were characterized with molecular markers. The substitution of bread wheat chromosome 5A by 5A of European spelt resulted in weakly hulled, pyramidal spikes with a non-brittle rachis, whereas and the substitution of 5A by 5A of Iranian spelt did not alter spike morphology at all. It is concluded that the expression of the spelt syndrome depends, to a large extent, on the interactions of q with genes controlling glume tenacity and rachis fragility on other chromosomes. The genetic basis for the spelt syndrome and the apparent presence of the Q allele in Iranian spelt are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050079
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  • 7
    Electronic Resource
    Electronic Resource
    Crossability percentages of bread wheat landraces from Sichuan Province, China with rye (1992)
    Springer
    Euphytica 61 (1992), S. 1-7 
    Details
    ISSN: 1573-5060
    Keywords: China ; crossability ; landrace ; rye ; Secale cereale ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The crossabilities of 177 landraces of wheat (Triticum aestivum L.) from Sichuan Basin and its adjacent mountain ranges with rye (Secale cereale L.) have been tested. 16 landraces possess a higher crossability than Chinese Spring, 34 landraces have a similar and 127 landraces have a lower crossability than Chinese Spring or are non-crossable with rye. Most landraces with high crossability occur in Qinling Mountain and Dabashan Mountain Ranges in north of Sichuan and the valleys of Minjiang River, Fujiang River and Jialinjiang River in Sichuan Basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035540
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  • 8
    Electronic Resource
    Electronic Resource
    Crossability percentages of bread wheat landraces from Shaanxi and Henan provinces, China with rye (1993)
    Springer
    Euphytica 67 (1993), S. 1-8 
    Details
    ISSN: 1573-5060
    Keywords: China ; crossability ; landrace ; rye ; Secale cereale ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The crossability percentages of 118 landraces of wheat (Triticum aestivum L.) from Shaanxi and Henan provinces, China with rye (Secale cereale L.) have been tested. 14 landraces possess a higher crossability percentage than Chinese Spring, 30 landraces have a similar to and 74 landraces have a lower crossability percentage than Chinese Spring or are non-crossable with rye. Most landraces with high crossability percentage occur in south part of Shaanxi, and the west and southwest of Henan, their geographical distribution in these regions fits up with that in the Sichuan province.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022718
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  • 9
    Electronic Resource
    Electronic Resource
    Crossability percentages of bread wheat collections from Tibet, China with rye (1993)
    Springer
    Euphytica 70 (1993), S. 127-129 
    Details
    ISSN: 1573-5060
    Keywords: China ; crossability ; landrace ; rye ; Secale cereale ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The crossability percentages of 282 accessions of wheat (Triticum aestivum L.) collected in Tibet, China with rye (Secale cereale L.) have been tested. Five collections have a similar to and 277 accessions have a lower crossability percentage than Chinese Spring or are non-crossable with rye. The accessions with high crossability percentage occur along the highway near Lhasa. No landraces with higher crossability than Chinese Spring and rare landraces with similar crossability to Chinese Spring indicated that the landraces in Tibet region are different from those in Sichuan, Shaanxi and Henan provinces in the distribution frequency of high crossability, and there is no distribution of recessive kr4 alleles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029649
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  • 10
    Electronic Resource
    Electronic Resource
    Mapping of the K+/Na+ discrimination locus Kna1 in wheat (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 448-454 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Salt tolerance ; Homoeologous recombination ; QTL ; RFLP ; Genetic marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In saline environments, bread wheat, Triticum aestivum L. (genomes AABBDD), accumulates less Na+ and more K+ in expanding and young leaves than durum wheat, T. turgidum L. (genomes AABB). Higher K+/Na+ ratios in leaves of bread wheat correlate with its higher salt tolerance. Chromosome 4D from bread wheat was shown in previous work to play an important role in the control of this trait and was recombined with chromosome 4B in the absence of the Ph1 locus. A population of plants disomic for 4D/4B recombined chromosomes in the genetic background of T. turgidum was developed to investigate the genetic control of K+/Na+ discrimination by chromosome 4D. Evidence was obtained that the trait is controlled by a single locus, designated Kna1, in the long arm of chromosome 4D. In the present work, K+/Na+ discrimination was determined for additional families with 4D/4B chromosomes. The concentrations of Na+ and K+/Na+ ratios in the youngest leaf blades clustered in two nonoverlapping classes, and all recombinant families could be unequivocally assigned to Kna1 and kna1 classes. The Kna1 locus scored this way was mapped on a short region in the 4DL arm and was completely linked to Xwg199, Xabc305, Xbcd.402, Xpsr567, and Xpsr375; it was also mapped as a quantitative trait. The results of the QTL analysis, based on the K+/Na+ ratios in the young leaves of greenhousegrown plants and flag leaves of field-grown plants, agreed with the position of Knal determined as a qualitative trait. Several aspects of gene introgression by manipulation of the Ph1 locus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223692
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